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![Andrew F. Davis](/assets/img/avatar_default.png)
Like other subsystems we should be able to define slave devices outside of the w1 directory. To do this we move public facing interface definitions to include/linux/w1.h and rename the internal definition file to w1_internal.h. As w1_family.h and w1_int.h contained almost entirely public driver interface definitions we simply removed these files and moved the remaining definitions into w1_internal.h. With this we can now start to move slave devices out of w1/slaves and into the subsystem based on the function they implement, again like other drivers. Signed-off-by: Andrew F. Davis <afd@ti.com> Reviewed-by: Sebastian Reichel <sre@kernel.org> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
748 lines
19 KiB
C
748 lines
19 KiB
C
/*
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* Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/connector.h>
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#include "w1_internal.h"
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#include "w1_netlink.h"
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#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
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/* Bundle together everything required to process a request in one memory
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* allocation.
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*/
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struct w1_cb_block {
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atomic_t refcnt;
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u32 portid; /* Sending process port ID */
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/* maximum value for first_cn->len */
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u16 maxlen;
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/* pointers to building up the reply message */
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struct cn_msg *first_cn; /* fixed once the structure is populated */
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struct cn_msg *cn; /* advances as cn_msg is appeneded */
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struct w1_netlink_msg *msg; /* advances as w1_netlink_msg is appened */
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struct w1_netlink_cmd *cmd; /* advances as cmds are appened */
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struct w1_netlink_msg *cur_msg; /* currently message being processed */
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/* copy of the original request follows */
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struct cn_msg request_cn;
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/* followed by variable length:
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* cn_msg, data (w1_netlink_msg and w1_netlink_cmd)
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* one or more struct w1_cb_node
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* reply first_cn, data (w1_netlink_msg and w1_netlink_cmd)
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*/
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};
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struct w1_cb_node {
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struct w1_async_cmd async;
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/* pointers within w1_cb_block and cn data */
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struct w1_cb_block *block;
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struct w1_netlink_msg *msg;
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struct w1_slave *sl;
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struct w1_master *dev;
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};
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/**
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* w1_reply_len() - calculate current reply length, compare to maxlen
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* @block: block to calculate
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*
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* Calculates the current message length including possible multiple
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* cn_msg and data, excludes the first sizeof(struct cn_msg). Direclty
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* compariable to maxlen and usable to send the message.
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*/
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static u16 w1_reply_len(struct w1_cb_block *block)
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{
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if (!block->cn)
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return 0;
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return (u8 *)block->cn - (u8 *)block->first_cn + block->cn->len;
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}
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static void w1_unref_block(struct w1_cb_block *block)
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{
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if (atomic_sub_return(1, &block->refcnt) == 0) {
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u16 len = w1_reply_len(block);
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if (len) {
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cn_netlink_send_mult(block->first_cn, len,
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block->portid, 0, GFP_KERNEL);
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}
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kfree(block);
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}
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}
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/**
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* w1_reply_make_space() - send message if needed to make space
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* @block: block to make space on
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* @space: how many bytes requested
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*
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* Verify there is enough room left for the caller to add "space" bytes to the
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* message, if there isn't send the message and reset.
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*/
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static void w1_reply_make_space(struct w1_cb_block *block, u16 space)
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{
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u16 len = w1_reply_len(block);
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if (len + space >= block->maxlen) {
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cn_netlink_send_mult(block->first_cn, len, block->portid, 0, GFP_KERNEL);
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block->first_cn->len = 0;
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block->cn = NULL;
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block->msg = NULL;
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block->cmd = NULL;
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}
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}
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/* Early send when replies aren't bundled. */
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static void w1_netlink_check_send(struct w1_cb_block *block)
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{
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if (!(block->request_cn.flags & W1_CN_BUNDLE) && block->cn)
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w1_reply_make_space(block, block->maxlen);
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}
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/**
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* w1_netlink_setup_msg() - prepare to write block->msg
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* @block: block to operate on
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* @ack: determines if cn can be reused
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*
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* block->cn will be setup with the correct ack, advancing if needed
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* block->cn->len does not include space for block->msg
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* block->msg advances but remains uninitialized
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*/
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static void w1_netlink_setup_msg(struct w1_cb_block *block, u32 ack)
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{
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if (block->cn && block->cn->ack == ack) {
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block->msg = (struct w1_netlink_msg *)(block->cn->data + block->cn->len);
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} else {
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/* advance or set to data */
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if (block->cn)
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block->cn = (struct cn_msg *)(block->cn->data +
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block->cn->len);
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else
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block->cn = block->first_cn;
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memcpy(block->cn, &block->request_cn, sizeof(*block->cn));
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block->cn->len = 0;
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block->cn->ack = ack;
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block->msg = (struct w1_netlink_msg *)block->cn->data;
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}
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}
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/* Append cmd to msg, include cmd->data as well. This is because
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* any following data goes with the command and in the case of a read is
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* the results.
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*/
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static void w1_netlink_queue_cmd(struct w1_cb_block *block,
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struct w1_netlink_cmd *cmd)
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{
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u32 space;
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w1_reply_make_space(block, sizeof(struct cn_msg) +
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sizeof(struct w1_netlink_msg) + sizeof(*cmd) + cmd->len);
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/* There's a status message sent after each command, so no point
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* in trying to bundle this cmd after an existing one, because
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* there won't be one. Allocate and copy over a new cn_msg.
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*/
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w1_netlink_setup_msg(block, block->request_cn.seq + 1);
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memcpy(block->msg, block->cur_msg, sizeof(*block->msg));
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block->cn->len += sizeof(*block->msg);
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block->msg->len = 0;
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block->cmd = (struct w1_netlink_cmd *)(block->msg->data);
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space = sizeof(*cmd) + cmd->len;
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if (block->cmd != cmd)
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memcpy(block->cmd, cmd, space);
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block->cn->len += space;
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block->msg->len += space;
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}
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/* Append req_msg and req_cmd, no other commands and no data from req_cmd are
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* copied.
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*/
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static void w1_netlink_queue_status(struct w1_cb_block *block,
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struct w1_netlink_msg *req_msg, struct w1_netlink_cmd *req_cmd,
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int error)
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{
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u16 space = sizeof(struct cn_msg) + sizeof(*req_msg) + sizeof(*req_cmd);
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w1_reply_make_space(block, space);
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w1_netlink_setup_msg(block, block->request_cn.ack);
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memcpy(block->msg, req_msg, sizeof(*req_msg));
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block->cn->len += sizeof(*req_msg);
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block->msg->len = 0;
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block->msg->status = (u8)-error;
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if (req_cmd) {
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struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)block->msg->data;
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memcpy(cmd, req_cmd, sizeof(*cmd));
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block->cn->len += sizeof(*cmd);
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block->msg->len += sizeof(*cmd);
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cmd->len = 0;
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}
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w1_netlink_check_send(block);
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}
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/**
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* w1_netlink_send_error() - sends the error message now
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* @cn: original cn_msg
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* @msg: original w1_netlink_msg
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* @portid: where to send it
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* @error: error status
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*
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* Use when a block isn't available to queue the message to and cn, msg
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* might not be contiguous.
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*/
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static void w1_netlink_send_error(struct cn_msg *cn, struct w1_netlink_msg *msg,
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int portid, int error)
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{
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struct {
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struct cn_msg cn;
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struct w1_netlink_msg msg;
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} packet;
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memcpy(&packet.cn, cn, sizeof(packet.cn));
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memcpy(&packet.msg, msg, sizeof(packet.msg));
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packet.cn.len = sizeof(packet.msg);
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packet.msg.len = 0;
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packet.msg.status = (u8)-error;
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cn_netlink_send(&packet.cn, portid, 0, GFP_KERNEL);
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}
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/**
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* w1_netlink_send() - sends w1 netlink notifications
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* @dev: w1_master the even is associated with or for
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* @msg: w1_netlink_msg message to be sent
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*
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* This are notifications generated from the kernel.
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*/
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void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
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{
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struct {
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struct cn_msg cn;
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struct w1_netlink_msg msg;
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} packet;
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memset(&packet, 0, sizeof(packet));
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packet.cn.id.idx = CN_W1_IDX;
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packet.cn.id.val = CN_W1_VAL;
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packet.cn.seq = dev->seq++;
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packet.cn.len = sizeof(*msg);
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memcpy(&packet.msg, msg, sizeof(*msg));
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packet.msg.len = 0;
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cn_netlink_send(&packet.cn, 0, 0, GFP_KERNEL);
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}
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static void w1_send_slave(struct w1_master *dev, u64 rn)
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{
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struct w1_cb_block *block = dev->priv;
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struct w1_netlink_cmd *cache_cmd = block->cmd;
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u64 *data;
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w1_reply_make_space(block, sizeof(*data));
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/* Add cmd back if the packet was sent */
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if (!block->cmd) {
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cache_cmd->len = 0;
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w1_netlink_queue_cmd(block, cache_cmd);
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}
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data = (u64 *)(block->cmd->data + block->cmd->len);
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*data = rn;
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block->cn->len += sizeof(*data);
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block->msg->len += sizeof(*data);
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block->cmd->len += sizeof(*data);
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}
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static void w1_found_send_slave(struct w1_master *dev, u64 rn)
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{
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/* update kernel slave list */
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w1_slave_found(dev, rn);
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w1_send_slave(dev, rn);
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}
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/* Get the current slave list, or search (with or without alarm) */
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static int w1_get_slaves(struct w1_master *dev, struct w1_netlink_cmd *req_cmd)
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{
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struct w1_slave *sl;
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req_cmd->len = 0;
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w1_netlink_queue_cmd(dev->priv, req_cmd);
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if (req_cmd->cmd == W1_CMD_LIST_SLAVES) {
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u64 rn;
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mutex_lock(&dev->list_mutex);
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list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
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memcpy(&rn, &sl->reg_num, sizeof(rn));
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w1_send_slave(dev, rn);
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}
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mutex_unlock(&dev->list_mutex);
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} else {
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w1_search_process_cb(dev, req_cmd->cmd == W1_CMD_ALARM_SEARCH ?
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W1_ALARM_SEARCH : W1_SEARCH, w1_found_send_slave);
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}
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return 0;
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}
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static int w1_process_command_io(struct w1_master *dev,
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struct w1_netlink_cmd *cmd)
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{
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int err = 0;
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switch (cmd->cmd) {
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case W1_CMD_TOUCH:
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w1_touch_block(dev, cmd->data, cmd->len);
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w1_netlink_queue_cmd(dev->priv, cmd);
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break;
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case W1_CMD_READ:
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w1_read_block(dev, cmd->data, cmd->len);
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w1_netlink_queue_cmd(dev->priv, cmd);
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break;
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case W1_CMD_WRITE:
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w1_write_block(dev, cmd->data, cmd->len);
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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static int w1_process_command_addremove(struct w1_master *dev,
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struct w1_netlink_cmd *cmd)
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{
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struct w1_slave *sl;
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int err = 0;
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struct w1_reg_num *id;
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if (cmd->len != sizeof(*id))
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return -EINVAL;
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id = (struct w1_reg_num *)cmd->data;
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sl = w1_slave_search_device(dev, id);
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switch (cmd->cmd) {
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case W1_CMD_SLAVE_ADD:
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if (sl)
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err = -EINVAL;
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else
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err = w1_attach_slave_device(dev, id);
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break;
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case W1_CMD_SLAVE_REMOVE:
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if (sl)
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w1_slave_detach(sl);
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else
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err = -EINVAL;
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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static int w1_process_command_master(struct w1_master *dev,
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struct w1_netlink_cmd *req_cmd)
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{
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int err = -EINVAL;
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/* drop bus_mutex for search (does it's own locking), and add/remove
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* which doesn't use the bus
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*/
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switch (req_cmd->cmd) {
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case W1_CMD_SEARCH:
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case W1_CMD_ALARM_SEARCH:
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case W1_CMD_LIST_SLAVES:
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mutex_unlock(&dev->bus_mutex);
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err = w1_get_slaves(dev, req_cmd);
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mutex_lock(&dev->bus_mutex);
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break;
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case W1_CMD_READ:
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case W1_CMD_WRITE:
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case W1_CMD_TOUCH:
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err = w1_process_command_io(dev, req_cmd);
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break;
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case W1_CMD_RESET:
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err = w1_reset_bus(dev);
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break;
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case W1_CMD_SLAVE_ADD:
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case W1_CMD_SLAVE_REMOVE:
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mutex_unlock(&dev->bus_mutex);
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mutex_lock(&dev->mutex);
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err = w1_process_command_addremove(dev, req_cmd);
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mutex_unlock(&dev->mutex);
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mutex_lock(&dev->bus_mutex);
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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static int w1_process_command_slave(struct w1_slave *sl,
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struct w1_netlink_cmd *cmd)
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{
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dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
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__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
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sl->reg_num.crc, cmd->cmd, cmd->len);
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return w1_process_command_io(sl->master, cmd);
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}
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static int w1_process_command_root(struct cn_msg *req_cn, u32 portid)
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{
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struct w1_master *dev;
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struct cn_msg *cn;
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struct w1_netlink_msg *msg;
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u32 *id;
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cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!cn)
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return -ENOMEM;
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cn->id.idx = CN_W1_IDX;
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cn->id.val = CN_W1_VAL;
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cn->seq = req_cn->seq;
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cn->ack = req_cn->seq + 1;
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cn->len = sizeof(struct w1_netlink_msg);
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msg = (struct w1_netlink_msg *)cn->data;
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msg->type = W1_LIST_MASTERS;
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msg->status = 0;
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msg->len = 0;
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id = (u32 *)msg->data;
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mutex_lock(&w1_mlock);
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list_for_each_entry(dev, &w1_masters, w1_master_entry) {
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if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
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cn_netlink_send(cn, portid, 0, GFP_KERNEL);
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cn->len = sizeof(struct w1_netlink_msg);
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msg->len = 0;
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id = (u32 *)msg->data;
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}
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*id = dev->id;
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msg->len += sizeof(*id);
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cn->len += sizeof(*id);
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id++;
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}
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cn_netlink_send(cn, portid, 0, GFP_KERNEL);
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mutex_unlock(&w1_mlock);
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kfree(cn);
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return 0;
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}
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static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
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{
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struct w1_cb_node *node = container_of(async_cmd, struct w1_cb_node,
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async);
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u16 mlen = node->msg->len;
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u16 len;
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int err = 0;
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struct w1_slave *sl = node->sl;
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struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)node->msg->data;
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mutex_lock(&dev->bus_mutex);
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dev->priv = node->block;
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if (sl && w1_reset_select_slave(sl))
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err = -ENODEV;
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node->block->cur_msg = node->msg;
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while (mlen && !err) {
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if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
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err = -E2BIG;
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break;
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}
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if (sl)
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err = w1_process_command_slave(sl, cmd);
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else
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err = w1_process_command_master(dev, cmd);
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w1_netlink_check_send(node->block);
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|
|
w1_netlink_queue_status(node->block, node->msg, cmd, err);
|
|
err = 0;
|
|
|
|
len = sizeof(*cmd) + cmd->len;
|
|
cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len);
|
|
mlen -= len;
|
|
}
|
|
|
|
if (!cmd || err)
|
|
w1_netlink_queue_status(node->block, node->msg, cmd, err);
|
|
|
|
/* ref taken in w1_search_slave or w1_search_master_id when building
|
|
* the block
|
|
*/
|
|
if (sl)
|
|
w1_unref_slave(sl);
|
|
else
|
|
atomic_dec(&dev->refcnt);
|
|
dev->priv = NULL;
|
|
mutex_unlock(&dev->bus_mutex);
|
|
|
|
mutex_lock(&dev->list_mutex);
|
|
list_del(&async_cmd->async_entry);
|
|
mutex_unlock(&dev->list_mutex);
|
|
|
|
w1_unref_block(node->block);
|
|
}
|
|
|
|
static void w1_list_count_cmds(struct w1_netlink_msg *msg, int *cmd_count,
|
|
u16 *slave_len)
|
|
{
|
|
struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)msg->data;
|
|
u16 mlen = msg->len;
|
|
u16 len;
|
|
int slave_list = 0;
|
|
while (mlen) {
|
|
if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen)
|
|
break;
|
|
|
|
switch (cmd->cmd) {
|
|
case W1_CMD_SEARCH:
|
|
case W1_CMD_ALARM_SEARCH:
|
|
case W1_CMD_LIST_SLAVES:
|
|
++slave_list;
|
|
}
|
|
++*cmd_count;
|
|
len = sizeof(*cmd) + cmd->len;
|
|
cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len);
|
|
mlen -= len;
|
|
}
|
|
|
|
if (slave_list) {
|
|
struct w1_master *dev = w1_search_master_id(msg->id.mst.id);
|
|
if (dev) {
|
|
/* Bytes, and likely an overstimate, and if it isn't
|
|
* the results can still be split between packets.
|
|
*/
|
|
*slave_len += sizeof(struct w1_reg_num) * slave_list *
|
|
(dev->slave_count + dev->max_slave_count);
|
|
/* search incremented it */
|
|
atomic_dec(&dev->refcnt);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp)
|
|
{
|
|
struct w1_netlink_msg *msg = (struct w1_netlink_msg *)(cn + 1);
|
|
struct w1_slave *sl;
|
|
struct w1_master *dev;
|
|
u16 msg_len;
|
|
u16 slave_len = 0;
|
|
int err = 0;
|
|
struct w1_cb_block *block = NULL;
|
|
struct w1_cb_node *node = NULL;
|
|
int node_count = 0;
|
|
int cmd_count = 0;
|
|
|
|
/* If any unknown flag is set let the application know, that way
|
|
* applications can detect the absence of features in kernels that
|
|
* don't know about them. http://lwn.net/Articles/587527/
|
|
*/
|
|
if (cn->flags & ~(W1_CN_BUNDLE)) {
|
|
w1_netlink_send_error(cn, msg, nsp->portid, -EINVAL);
|
|
return;
|
|
}
|
|
|
|
/* Count the number of master or slave commands there are to allocate
|
|
* space for one cb_node each.
|
|
*/
|
|
msg_len = cn->len;
|
|
while (msg_len && !err) {
|
|
if (msg->len + sizeof(struct w1_netlink_msg) > msg_len) {
|
|
err = -E2BIG;
|
|
break;
|
|
}
|
|
|
|
/* count messages for nodes and allocate any additional space
|
|
* required for slave lists
|
|
*/
|
|
if (msg->type == W1_MASTER_CMD || msg->type == W1_SLAVE_CMD) {
|
|
++node_count;
|
|
w1_list_count_cmds(msg, &cmd_count, &slave_len);
|
|
}
|
|
|
|
msg_len -= sizeof(struct w1_netlink_msg) + msg->len;
|
|
msg = (struct w1_netlink_msg *)(((u8 *)msg) +
|
|
sizeof(struct w1_netlink_msg) + msg->len);
|
|
}
|
|
msg = (struct w1_netlink_msg *)(cn + 1);
|
|
if (node_count) {
|
|
int size;
|
|
int reply_size = sizeof(*cn) + cn->len + slave_len;
|
|
if (cn->flags & W1_CN_BUNDLE) {
|
|
/* bundling duplicats some of the messages */
|
|
reply_size += 2 * cmd_count * (sizeof(struct cn_msg) +
|
|
sizeof(struct w1_netlink_msg) +
|
|
sizeof(struct w1_netlink_cmd));
|
|
}
|
|
reply_size = min(CONNECTOR_MAX_MSG_SIZE, reply_size);
|
|
|
|
/* allocate space for the block, a copy of the original message,
|
|
* one node per cmd to point into the original message,
|
|
* space for replies which is the original message size plus
|
|
* space for any list slave data and status messages
|
|
* cn->len doesn't include itself which is part of the block
|
|
* */
|
|
size = /* block + original message */
|
|
sizeof(struct w1_cb_block) + sizeof(*cn) + cn->len +
|
|
/* space for nodes */
|
|
node_count * sizeof(struct w1_cb_node) +
|
|
/* replies */
|
|
sizeof(struct cn_msg) + reply_size;
|
|
block = kzalloc(size, GFP_KERNEL);
|
|
if (!block) {
|
|
/* if the system is already out of memory,
|
|
* (A) will this work, and (B) would it be better
|
|
* to not try?
|
|
*/
|
|
w1_netlink_send_error(cn, msg, nsp->portid, -ENOMEM);
|
|
return;
|
|
}
|
|
atomic_set(&block->refcnt, 1);
|
|
block->portid = nsp->portid;
|
|
memcpy(&block->request_cn, cn, sizeof(*cn) + cn->len);
|
|
node = (struct w1_cb_node *)(block->request_cn.data + cn->len);
|
|
|
|
/* Sneeky, when not bundling, reply_size is the allocated space
|
|
* required for the reply, cn_msg isn't part of maxlen so
|
|
* it should be reply_size - sizeof(struct cn_msg), however
|
|
* when checking if there is enough space, w1_reply_make_space
|
|
* is called with the full message size including cn_msg,
|
|
* because it isn't known at that time if an additional cn_msg
|
|
* will need to be allocated. So an extra cn_msg is added
|
|
* above in "size".
|
|
*/
|
|
block->maxlen = reply_size;
|
|
block->first_cn = (struct cn_msg *)(node + node_count);
|
|
memset(block->first_cn, 0, sizeof(*block->first_cn));
|
|
}
|
|
|
|
msg_len = cn->len;
|
|
while (msg_len && !err) {
|
|
|
|
dev = NULL;
|
|
sl = NULL;
|
|
|
|
if (msg->len + sizeof(struct w1_netlink_msg) > msg_len) {
|
|
err = -E2BIG;
|
|
break;
|
|
}
|
|
|
|
/* execute on this thread, no need to process later */
|
|
if (msg->type == W1_LIST_MASTERS) {
|
|
err = w1_process_command_root(cn, nsp->portid);
|
|
goto out_cont;
|
|
}
|
|
|
|
/* All following message types require additional data,
|
|
* check here before references are taken.
|
|
*/
|
|
if (!msg->len) {
|
|
err = -EPROTO;
|
|
goto out_cont;
|
|
}
|
|
|
|
/* both search calls take references */
|
|
if (msg->type == W1_MASTER_CMD) {
|
|
dev = w1_search_master_id(msg->id.mst.id);
|
|
} else if (msg->type == W1_SLAVE_CMD) {
|
|
sl = w1_search_slave((struct w1_reg_num *)msg->id.id);
|
|
if (sl)
|
|
dev = sl->master;
|
|
} else {
|
|
pr_notice("%s: cn: %x.%x, wrong type: %u, len: %u.\n",
|
|
__func__, cn->id.idx, cn->id.val,
|
|
msg->type, msg->len);
|
|
err = -EPROTO;
|
|
goto out_cont;
|
|
}
|
|
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto out_cont;
|
|
}
|
|
|
|
err = 0;
|
|
|
|
atomic_inc(&block->refcnt);
|
|
node->async.cb = w1_process_cb;
|
|
node->block = block;
|
|
node->msg = (struct w1_netlink_msg *)((u8 *)&block->request_cn +
|
|
(size_t)((u8 *)msg - (u8 *)cn));
|
|
node->sl = sl;
|
|
node->dev = dev;
|
|
|
|
mutex_lock(&dev->list_mutex);
|
|
list_add_tail(&node->async.async_entry, &dev->async_list);
|
|
wake_up_process(dev->thread);
|
|
mutex_unlock(&dev->list_mutex);
|
|
++node;
|
|
|
|
out_cont:
|
|
/* Can't queue because that modifies block and another
|
|
* thread could be processing the messages by now and
|
|
* there isn't a lock, send directly.
|
|
*/
|
|
if (err)
|
|
w1_netlink_send_error(cn, msg, nsp->portid, err);
|
|
msg_len -= sizeof(struct w1_netlink_msg) + msg->len;
|
|
msg = (struct w1_netlink_msg *)(((u8 *)msg) +
|
|
sizeof(struct w1_netlink_msg) + msg->len);
|
|
|
|
/*
|
|
* Let's allow requests for nonexisting devices.
|
|
*/
|
|
if (err == -ENODEV)
|
|
err = 0;
|
|
}
|
|
if (block)
|
|
w1_unref_block(block);
|
|
}
|
|
|
|
int w1_init_netlink(void)
|
|
{
|
|
struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
|
|
|
|
return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
|
|
}
|
|
|
|
void w1_fini_netlink(void)
|
|
{
|
|
struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
|
|
|
|
cn_del_callback(&w1_id);
|
|
}
|
|
#else
|
|
void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *cn)
|
|
{
|
|
}
|
|
|
|
int w1_init_netlink(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void w1_fini_netlink(void)
|
|
{
|
|
}
|
|
#endif
|