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![Arnd Bergmann](/assets/img/avatar_default.png)
A newly added bugfix caused an uninitialized variable to be
used for printing debug output. This is harmless as long
as the debug setting is disabled, but otherwise leads to an
immediate crash.
gcc warns about this when -Wmaybe-uninitialized is enabled:
net/rxrpc/call_object.c: In function 'rxrpc_release_call':
net/rxrpc/call_object.c:496:163: error: 'sp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
The initialization was removed but one of the users remains.
This adds back the initialization.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 372ee16386
("rxrpc: Fix races between skb free, ACK generation and replying")
Signed-off-by: David Howells <dhowells@redhat.com>
799 lines
20 KiB
C
799 lines
20 KiB
C
/* RxRPC individual remote procedure call handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/circ_buf.h>
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#include <linux/spinlock_types.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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/*
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* Maximum lifetime of a call (in jiffies).
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*/
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unsigned int rxrpc_max_call_lifetime = 60 * HZ;
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/*
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* Time till dead call expires after last use (in jiffies).
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*/
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unsigned int rxrpc_dead_call_expiry = 2 * HZ;
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const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
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[RXRPC_CALL_UNINITIALISED] = "Uninit",
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[RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
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[RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
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[RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
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[RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
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[RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK",
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[RXRPC_CALL_SERVER_SECURING] = "SvSecure",
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[RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
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[RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
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[RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
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[RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
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[RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
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[RXRPC_CALL_COMPLETE] = "Complete",
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[RXRPC_CALL_SERVER_BUSY] = "SvBusy ",
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[RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
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[RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
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[RXRPC_CALL_NETWORK_ERROR] = "NetError",
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[RXRPC_CALL_DEAD] = "Dead ",
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};
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struct kmem_cache *rxrpc_call_jar;
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LIST_HEAD(rxrpc_calls);
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DEFINE_RWLOCK(rxrpc_call_lock);
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static void rxrpc_destroy_call(struct work_struct *work);
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static void rxrpc_call_life_expired(unsigned long _call);
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static void rxrpc_dead_call_expired(unsigned long _call);
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static void rxrpc_ack_time_expired(unsigned long _call);
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static void rxrpc_resend_time_expired(unsigned long _call);
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/*
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* find an extant server call
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* - called in process context with IRQs enabled
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*/
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struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
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unsigned long user_call_ID)
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{
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struct rxrpc_call *call;
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struct rb_node *p;
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_enter("%p,%lx", rx, user_call_ID);
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read_lock(&rx->call_lock);
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p = rx->calls.rb_node;
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while (p) {
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call = rb_entry(p, struct rxrpc_call, sock_node);
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if (user_call_ID < call->user_call_ID)
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p = p->rb_left;
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else if (user_call_ID > call->user_call_ID)
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p = p->rb_right;
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else
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goto found_extant_call;
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}
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read_unlock(&rx->call_lock);
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_leave(" = NULL");
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return NULL;
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found_extant_call:
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rxrpc_get_call(call);
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read_unlock(&rx->call_lock);
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_leave(" = %p [%d]", call, atomic_read(&call->usage));
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return call;
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}
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/*
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* allocate a new call
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*/
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static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
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{
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struct rxrpc_call *call;
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call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
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if (!call)
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return NULL;
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call->acks_winsz = 16;
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call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long),
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gfp);
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if (!call->acks_window) {
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kmem_cache_free(rxrpc_call_jar, call);
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return NULL;
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}
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setup_timer(&call->lifetimer, &rxrpc_call_life_expired,
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(unsigned long) call);
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setup_timer(&call->deadspan, &rxrpc_dead_call_expired,
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(unsigned long) call);
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setup_timer(&call->ack_timer, &rxrpc_ack_time_expired,
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(unsigned long) call);
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setup_timer(&call->resend_timer, &rxrpc_resend_time_expired,
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(unsigned long) call);
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INIT_WORK(&call->destroyer, &rxrpc_destroy_call);
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INIT_WORK(&call->processor, &rxrpc_process_call);
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INIT_LIST_HEAD(&call->link);
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INIT_LIST_HEAD(&call->accept_link);
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skb_queue_head_init(&call->rx_queue);
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skb_queue_head_init(&call->rx_oos_queue);
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init_waitqueue_head(&call->tx_waitq);
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spin_lock_init(&call->lock);
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rwlock_init(&call->state_lock);
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atomic_set(&call->usage, 1);
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call->debug_id = atomic_inc_return(&rxrpc_debug_id);
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memset(&call->sock_node, 0xed, sizeof(call->sock_node));
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call->rx_data_expect = 1;
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call->rx_data_eaten = 0;
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call->rx_first_oos = 0;
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call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size;
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call->creation_jif = jiffies;
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return call;
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}
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/*
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* Allocate a new client call.
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*/
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static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
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struct sockaddr_rxrpc *srx,
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gfp_t gfp)
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{
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struct rxrpc_call *call;
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_enter("");
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ASSERT(rx->local != NULL);
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call = rxrpc_alloc_call(gfp);
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if (!call)
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return ERR_PTR(-ENOMEM);
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call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
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sock_hold(&rx->sk);
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call->socket = rx;
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call->rx_data_post = 1;
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call->local = rx->local;
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call->service_id = srx->srx_service;
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call->in_clientflag = 0;
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_leave(" = %p", call);
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return call;
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}
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/*
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* Begin client call.
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*/
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static int rxrpc_begin_client_call(struct rxrpc_call *call,
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struct rxrpc_conn_parameters *cp,
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struct sockaddr_rxrpc *srx,
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gfp_t gfp)
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{
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int ret;
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/* Set up or get a connection record and set the protocol parameters,
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* including channel number and call ID.
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*/
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ret = rxrpc_connect_call(call, cp, srx, gfp);
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if (ret < 0)
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return ret;
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call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
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spin_lock(&call->conn->params.peer->lock);
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hlist_add_head(&call->error_link, &call->conn->params.peer->error_targets);
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spin_unlock(&call->conn->params.peer->lock);
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call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
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add_timer(&call->lifetimer);
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return 0;
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}
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/*
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* set up a call for the given data
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* - called in process context with IRQs enabled
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*/
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struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
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struct rxrpc_conn_parameters *cp,
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struct sockaddr_rxrpc *srx,
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unsigned long user_call_ID,
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gfp_t gfp)
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{
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struct rxrpc_call *call, *xcall;
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struct rb_node *parent, **pp;
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int ret;
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_enter("%p,%lx", rx, user_call_ID);
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call = rxrpc_alloc_client_call(rx, srx, gfp);
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if (IS_ERR(call)) {
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_leave(" = %ld", PTR_ERR(call));
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return call;
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}
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/* Publish the call, even though it is incompletely set up as yet */
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call->user_call_ID = user_call_ID;
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__set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
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write_lock(&rx->call_lock);
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pp = &rx->calls.rb_node;
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parent = NULL;
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while (*pp) {
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parent = *pp;
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xcall = rb_entry(parent, struct rxrpc_call, sock_node);
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if (user_call_ID < xcall->user_call_ID)
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pp = &(*pp)->rb_left;
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else if (user_call_ID > xcall->user_call_ID)
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pp = &(*pp)->rb_right;
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else
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goto found_user_ID_now_present;
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}
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rxrpc_get_call(call);
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rb_link_node(&call->sock_node, parent, pp);
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rb_insert_color(&call->sock_node, &rx->calls);
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write_unlock(&rx->call_lock);
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write_lock_bh(&rxrpc_call_lock);
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list_add_tail(&call->link, &rxrpc_calls);
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write_unlock_bh(&rxrpc_call_lock);
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ret = rxrpc_begin_client_call(call, cp, srx, gfp);
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if (ret < 0)
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goto error;
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_net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
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_leave(" = %p [new]", call);
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return call;
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error:
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write_lock(&rx->call_lock);
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rb_erase(&call->sock_node, &rx->calls);
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write_unlock(&rx->call_lock);
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rxrpc_put_call(call);
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write_lock_bh(&rxrpc_call_lock);
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list_del_init(&call->link);
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write_unlock_bh(&rxrpc_call_lock);
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call->state = RXRPC_CALL_DEAD;
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rxrpc_put_call(call);
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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/* We unexpectedly found the user ID in the list after taking
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* the call_lock. This shouldn't happen unless the user races
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* with itself and tries to add the same user ID twice at the
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* same time in different threads.
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*/
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found_user_ID_now_present:
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write_unlock(&rx->call_lock);
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call->state = RXRPC_CALL_DEAD;
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rxrpc_put_call(call);
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_leave(" = -EEXIST [%p]", call);
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return ERR_PTR(-EEXIST);
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}
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/*
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* set up an incoming call
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* - called in process context with IRQs enabled
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*/
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struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
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struct rxrpc_connection *conn,
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struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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struct rxrpc_call *call, *candidate;
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u32 call_id, chan;
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_enter(",%d", conn->debug_id);
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ASSERT(rx != NULL);
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candidate = rxrpc_alloc_call(GFP_NOIO);
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if (!candidate)
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return ERR_PTR(-EBUSY);
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chan = sp->hdr.cid & RXRPC_CHANNELMASK;
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candidate->socket = rx;
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candidate->conn = conn;
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candidate->cid = sp->hdr.cid;
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candidate->call_id = sp->hdr.callNumber;
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candidate->channel = chan;
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candidate->rx_data_post = 0;
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candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
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if (conn->security_ix > 0)
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candidate->state = RXRPC_CALL_SERVER_SECURING;
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spin_lock(&conn->channel_lock);
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/* set the channel for this call */
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call = rcu_dereference_protected(conn->channels[chan].call,
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lockdep_is_held(&conn->channel_lock));
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_debug("channel[%u] is %p", candidate->channel, call);
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if (call && call->call_id == sp->hdr.callNumber) {
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/* already set; must've been a duplicate packet */
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_debug("extant call [%d]", call->state);
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ASSERTCMP(call->conn, ==, conn);
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read_lock(&call->state_lock);
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switch (call->state) {
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case RXRPC_CALL_LOCALLY_ABORTED:
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if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events))
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rxrpc_queue_call(call);
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case RXRPC_CALL_REMOTELY_ABORTED:
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read_unlock(&call->state_lock);
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goto aborted_call;
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default:
|
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rxrpc_get_call(call);
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read_unlock(&call->state_lock);
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goto extant_call;
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}
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}
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if (call) {
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/* it seems the channel is still in use from the previous call
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* - ditch the old binding if its call is now complete */
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_debug("CALL: %u { %s }",
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call->debug_id, rxrpc_call_states[call->state]);
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if (call->state >= RXRPC_CALL_COMPLETE) {
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__rxrpc_disconnect_call(call);
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} else {
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spin_unlock(&conn->channel_lock);
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kmem_cache_free(rxrpc_call_jar, candidate);
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_leave(" = -EBUSY");
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return ERR_PTR(-EBUSY);
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}
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}
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|
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/* check the call number isn't duplicate */
|
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_debug("check dup");
|
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call_id = sp->hdr.callNumber;
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|
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/* We just ignore calls prior to the current call ID. Terminated calls
|
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* are handled via the connection.
|
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*/
|
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if (call_id <= conn->channels[chan].call_counter)
|
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goto old_call; /* TODO: Just drop packet */
|
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|
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/* make the call available */
|
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_debug("new call");
|
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call = candidate;
|
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candidate = NULL;
|
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conn->channels[chan].call_counter = call_id;
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rcu_assign_pointer(conn->channels[chan].call, call);
|
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sock_hold(&rx->sk);
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rxrpc_get_connection(conn);
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spin_unlock(&conn->channel_lock);
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|
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spin_lock(&conn->params.peer->lock);
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hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
|
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spin_unlock(&conn->params.peer->lock);
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|
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write_lock_bh(&rxrpc_call_lock);
|
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list_add_tail(&call->link, &rxrpc_calls);
|
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write_unlock_bh(&rxrpc_call_lock);
|
|
|
|
call->local = conn->params.local;
|
|
call->epoch = conn->proto.epoch;
|
|
call->service_id = conn->params.service_id;
|
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call->in_clientflag = RXRPC_CLIENT_INITIATED;
|
|
|
|
_net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
|
|
|
|
call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
|
|
add_timer(&call->lifetimer);
|
|
_leave(" = %p {%d} [new]", call, call->debug_id);
|
|
return call;
|
|
|
|
extant_call:
|
|
spin_unlock(&conn->channel_lock);
|
|
kmem_cache_free(rxrpc_call_jar, candidate);
|
|
_leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1);
|
|
return call;
|
|
|
|
aborted_call:
|
|
spin_unlock(&conn->channel_lock);
|
|
kmem_cache_free(rxrpc_call_jar, candidate);
|
|
_leave(" = -ECONNABORTED");
|
|
return ERR_PTR(-ECONNABORTED);
|
|
|
|
old_call:
|
|
spin_unlock(&conn->channel_lock);
|
|
kmem_cache_free(rxrpc_call_jar, candidate);
|
|
_leave(" = -ECONNRESET [old]");
|
|
return ERR_PTR(-ECONNRESET);
|
|
}
|
|
|
|
/*
|
|
* detach a call from a socket and set up for release
|
|
*/
|
|
void rxrpc_release_call(struct rxrpc_call *call)
|
|
{
|
|
struct rxrpc_connection *conn = call->conn;
|
|
struct rxrpc_sock *rx = call->socket;
|
|
|
|
_enter("{%d,%d,%d,%d}",
|
|
call->debug_id, atomic_read(&call->usage),
|
|
atomic_read(&call->ackr_not_idle),
|
|
call->rx_first_oos);
|
|
|
|
spin_lock_bh(&call->lock);
|
|
if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
|
|
BUG();
|
|
spin_unlock_bh(&call->lock);
|
|
|
|
/* dissociate from the socket
|
|
* - the socket's ref on the call is passed to the death timer
|
|
*/
|
|
_debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
|
|
|
|
spin_lock(&conn->params.peer->lock);
|
|
hlist_del_init(&call->error_link);
|
|
spin_unlock(&conn->params.peer->lock);
|
|
|
|
write_lock_bh(&rx->call_lock);
|
|
if (!list_empty(&call->accept_link)) {
|
|
_debug("unlinking once-pending call %p { e=%lx f=%lx }",
|
|
call, call->events, call->flags);
|
|
ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
|
|
list_del_init(&call->accept_link);
|
|
sk_acceptq_removed(&rx->sk);
|
|
} else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
|
|
rb_erase(&call->sock_node, &rx->calls);
|
|
memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
|
|
clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
|
|
}
|
|
write_unlock_bh(&rx->call_lock);
|
|
|
|
/* free up the channel for reuse */
|
|
write_lock_bh(&call->state_lock);
|
|
|
|
if (call->state < RXRPC_CALL_COMPLETE &&
|
|
call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
|
|
_debug("+++ ABORTING STATE %d +++\n", call->state);
|
|
call->state = RXRPC_CALL_LOCALLY_ABORTED;
|
|
call->local_abort = RX_CALL_DEAD;
|
|
}
|
|
write_unlock_bh(&call->state_lock);
|
|
|
|
rxrpc_disconnect_call(call);
|
|
|
|
/* clean up the Rx queue */
|
|
if (!skb_queue_empty(&call->rx_queue) ||
|
|
!skb_queue_empty(&call->rx_oos_queue)) {
|
|
struct rxrpc_skb_priv *sp;
|
|
struct sk_buff *skb;
|
|
|
|
_debug("purge Rx queues");
|
|
|
|
spin_lock_bh(&call->lock);
|
|
while ((skb = skb_dequeue(&call->rx_queue)) ||
|
|
(skb = skb_dequeue(&call->rx_oos_queue))) {
|
|
spin_unlock_bh(&call->lock);
|
|
|
|
sp = rxrpc_skb(skb);
|
|
_debug("- zap %s %%%u #%u",
|
|
rxrpc_pkts[sp->hdr.type],
|
|
sp->hdr.serial, sp->hdr.seq);
|
|
rxrpc_free_skb(skb);
|
|
spin_lock_bh(&call->lock);
|
|
}
|
|
spin_unlock_bh(&call->lock);
|
|
|
|
ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
|
|
}
|
|
|
|
del_timer_sync(&call->resend_timer);
|
|
del_timer_sync(&call->ack_timer);
|
|
del_timer_sync(&call->lifetimer);
|
|
call->deadspan.expires = jiffies + rxrpc_dead_call_expiry;
|
|
add_timer(&call->deadspan);
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* handle a dead call being ready for reaping
|
|
*/
|
|
static void rxrpc_dead_call_expired(unsigned long _call)
|
|
{
|
|
struct rxrpc_call *call = (struct rxrpc_call *) _call;
|
|
|
|
_enter("{%d}", call->debug_id);
|
|
|
|
write_lock_bh(&call->state_lock);
|
|
call->state = RXRPC_CALL_DEAD;
|
|
write_unlock_bh(&call->state_lock);
|
|
rxrpc_put_call(call);
|
|
}
|
|
|
|
/*
|
|
* mark a call as to be released, aborting it if it's still in progress
|
|
* - called with softirqs disabled
|
|
*/
|
|
static void rxrpc_mark_call_released(struct rxrpc_call *call)
|
|
{
|
|
bool sched;
|
|
|
|
write_lock(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_DEAD) {
|
|
sched = false;
|
|
if (call->state < RXRPC_CALL_COMPLETE) {
|
|
_debug("abort call %p", call);
|
|
call->state = RXRPC_CALL_LOCALLY_ABORTED;
|
|
call->local_abort = RX_CALL_DEAD;
|
|
if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events))
|
|
sched = true;
|
|
}
|
|
if (!test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events))
|
|
sched = true;
|
|
if (sched)
|
|
rxrpc_queue_call(call);
|
|
}
|
|
write_unlock(&call->state_lock);
|
|
}
|
|
|
|
/*
|
|
* release all the calls associated with a socket
|
|
*/
|
|
void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
|
|
{
|
|
struct rxrpc_call *call;
|
|
struct rb_node *p;
|
|
|
|
_enter("%p", rx);
|
|
|
|
read_lock_bh(&rx->call_lock);
|
|
|
|
/* mark all the calls as no longer wanting incoming packets */
|
|
for (p = rb_first(&rx->calls); p; p = rb_next(p)) {
|
|
call = rb_entry(p, struct rxrpc_call, sock_node);
|
|
rxrpc_mark_call_released(call);
|
|
}
|
|
|
|
/* kill the not-yet-accepted incoming calls */
|
|
list_for_each_entry(call, &rx->secureq, accept_link) {
|
|
rxrpc_mark_call_released(call);
|
|
}
|
|
|
|
list_for_each_entry(call, &rx->acceptq, accept_link) {
|
|
rxrpc_mark_call_released(call);
|
|
}
|
|
|
|
read_unlock_bh(&rx->call_lock);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* release a call
|
|
*/
|
|
void __rxrpc_put_call(struct rxrpc_call *call)
|
|
{
|
|
ASSERT(call != NULL);
|
|
|
|
_enter("%p{u=%d}", call, atomic_read(&call->usage));
|
|
|
|
ASSERTCMP(atomic_read(&call->usage), >, 0);
|
|
|
|
if (atomic_dec_and_test(&call->usage)) {
|
|
_debug("call %d dead", call->debug_id);
|
|
WARN_ON(atomic_read(&call->skb_count) != 0);
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
|
|
rxrpc_queue_work(&call->destroyer);
|
|
}
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* Final call destruction under RCU.
|
|
*/
|
|
static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
|
|
{
|
|
struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
|
|
|
|
rxrpc_purge_queue(&call->rx_queue);
|
|
kmem_cache_free(rxrpc_call_jar, call);
|
|
}
|
|
|
|
/*
|
|
* clean up a call
|
|
*/
|
|
static void rxrpc_cleanup_call(struct rxrpc_call *call)
|
|
{
|
|
_net("DESTROY CALL %d", call->debug_id);
|
|
|
|
ASSERT(call->socket);
|
|
|
|
memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
|
|
|
|
del_timer_sync(&call->lifetimer);
|
|
del_timer_sync(&call->deadspan);
|
|
del_timer_sync(&call->ack_timer);
|
|
del_timer_sync(&call->resend_timer);
|
|
|
|
ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
|
|
ASSERTCMP(call->events, ==, 0);
|
|
if (work_pending(&call->processor)) {
|
|
_debug("defer destroy");
|
|
rxrpc_queue_work(&call->destroyer);
|
|
return;
|
|
}
|
|
|
|
ASSERTCMP(call->conn, ==, NULL);
|
|
|
|
if (call->acks_window) {
|
|
_debug("kill Tx window %d",
|
|
CIRC_CNT(call->acks_head, call->acks_tail,
|
|
call->acks_winsz));
|
|
smp_mb();
|
|
while (CIRC_CNT(call->acks_head, call->acks_tail,
|
|
call->acks_winsz) > 0) {
|
|
struct rxrpc_skb_priv *sp;
|
|
unsigned long _skb;
|
|
|
|
_skb = call->acks_window[call->acks_tail] & ~1;
|
|
sp = rxrpc_skb((struct sk_buff *)_skb);
|
|
_debug("+++ clear Tx %u", sp->hdr.seq);
|
|
rxrpc_free_skb((struct sk_buff *)_skb);
|
|
call->acks_tail =
|
|
(call->acks_tail + 1) & (call->acks_winsz - 1);
|
|
}
|
|
|
|
kfree(call->acks_window);
|
|
}
|
|
|
|
rxrpc_free_skb(call->tx_pending);
|
|
|
|
rxrpc_purge_queue(&call->rx_queue);
|
|
ASSERT(skb_queue_empty(&call->rx_oos_queue));
|
|
sock_put(&call->socket->sk);
|
|
call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
|
|
}
|
|
|
|
/*
|
|
* destroy a call
|
|
*/
|
|
static void rxrpc_destroy_call(struct work_struct *work)
|
|
{
|
|
struct rxrpc_call *call =
|
|
container_of(work, struct rxrpc_call, destroyer);
|
|
|
|
_enter("%p{%d,%d,%p}",
|
|
call, atomic_read(&call->usage), call->channel, call->conn);
|
|
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
|
|
|
|
write_lock_bh(&rxrpc_call_lock);
|
|
list_del_init(&call->link);
|
|
write_unlock_bh(&rxrpc_call_lock);
|
|
|
|
rxrpc_cleanup_call(call);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* preemptively destroy all the call records from a transport endpoint rather
|
|
* than waiting for them to time out
|
|
*/
|
|
void __exit rxrpc_destroy_all_calls(void)
|
|
{
|
|
struct rxrpc_call *call;
|
|
|
|
_enter("");
|
|
write_lock_bh(&rxrpc_call_lock);
|
|
|
|
while (!list_empty(&rxrpc_calls)) {
|
|
call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
|
|
_debug("Zapping call %p", call);
|
|
|
|
list_del_init(&call->link);
|
|
|
|
switch (atomic_read(&call->usage)) {
|
|
case 0:
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
|
|
break;
|
|
case 1:
|
|
if (del_timer_sync(&call->deadspan) != 0 &&
|
|
call->state != RXRPC_CALL_DEAD)
|
|
rxrpc_dead_call_expired((unsigned long) call);
|
|
if (call->state != RXRPC_CALL_DEAD)
|
|
break;
|
|
default:
|
|
pr_err("Call %p still in use (%d,%d,%s,%lx,%lx)!\n",
|
|
call, atomic_read(&call->usage),
|
|
atomic_read(&call->ackr_not_idle),
|
|
rxrpc_call_states[call->state],
|
|
call->flags, call->events);
|
|
if (!skb_queue_empty(&call->rx_queue))
|
|
pr_err("Rx queue occupied\n");
|
|
if (!skb_queue_empty(&call->rx_oos_queue))
|
|
pr_err("OOS queue occupied\n");
|
|
break;
|
|
}
|
|
|
|
write_unlock_bh(&rxrpc_call_lock);
|
|
cond_resched();
|
|
write_lock_bh(&rxrpc_call_lock);
|
|
}
|
|
|
|
write_unlock_bh(&rxrpc_call_lock);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* handle call lifetime being exceeded
|
|
*/
|
|
static void rxrpc_call_life_expired(unsigned long _call)
|
|
{
|
|
struct rxrpc_call *call = (struct rxrpc_call *) _call;
|
|
|
|
if (call->state >= RXRPC_CALL_COMPLETE)
|
|
return;
|
|
|
|
_enter("{%d}", call->debug_id);
|
|
read_lock_bh(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_COMPLETE) {
|
|
set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events);
|
|
rxrpc_queue_call(call);
|
|
}
|
|
read_unlock_bh(&call->state_lock);
|
|
}
|
|
|
|
/*
|
|
* handle resend timer expiry
|
|
* - may not take call->state_lock as this can deadlock against del_timer_sync()
|
|
*/
|
|
static void rxrpc_resend_time_expired(unsigned long _call)
|
|
{
|
|
struct rxrpc_call *call = (struct rxrpc_call *) _call;
|
|
|
|
_enter("{%d}", call->debug_id);
|
|
|
|
if (call->state >= RXRPC_CALL_COMPLETE)
|
|
return;
|
|
|
|
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
|
|
if (!test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
|
|
rxrpc_queue_call(call);
|
|
}
|
|
|
|
/*
|
|
* handle ACK timer expiry
|
|
*/
|
|
static void rxrpc_ack_time_expired(unsigned long _call)
|
|
{
|
|
struct rxrpc_call *call = (struct rxrpc_call *) _call;
|
|
|
|
_enter("{%d}", call->debug_id);
|
|
|
|
if (call->state >= RXRPC_CALL_COMPLETE)
|
|
return;
|
|
|
|
read_lock_bh(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_COMPLETE &&
|
|
!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
|
|
rxrpc_queue_call(call);
|
|
read_unlock_bh(&call->state_lock);
|
|
}
|