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![Kees Cook](/assets/img/avatar_default.png)
Calling dev_set_name with a single paramter causes it to be handled as a format string. Many callers are passing potentially dynamic string content, so use "%s" in those cases to avoid any potential accidents, including wrappers like device_create*() and bdi_register(). Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
507 lines
12 KiB
C
507 lines
12 KiB
C
/*
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* HSI core.
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*
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* Copyright (C) 2010 Nokia Corporation. All rights reserved.
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*
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* Contact: Carlos Chinea <carlos.chinea@nokia.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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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/hsi/hsi.h>
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#include <linux/compiler.h>
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#include <linux/list.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/notifier.h>
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#include "hsi_core.h"
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *a __maybe_unused, char *buf)
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{
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return sprintf(buf, "hsi:%s\n", dev_name(dev));
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}
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static struct device_attribute hsi_bus_dev_attrs[] = {
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__ATTR_RO(modalias),
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__ATTR_NULL,
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};
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static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
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return 0;
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}
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static int hsi_bus_match(struct device *dev, struct device_driver *driver)
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{
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return strcmp(dev_name(dev), driver->name) == 0;
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}
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static struct bus_type hsi_bus_type = {
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.name = "hsi",
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.dev_attrs = hsi_bus_dev_attrs,
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.match = hsi_bus_match,
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.uevent = hsi_bus_uevent,
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};
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static void hsi_client_release(struct device *dev)
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{
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kfree(to_hsi_client(dev));
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}
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static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
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{
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struct hsi_client *cl;
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cl = kzalloc(sizeof(*cl), GFP_KERNEL);
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if (!cl)
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return;
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cl->tx_cfg = info->tx_cfg;
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cl->rx_cfg = info->rx_cfg;
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cl->device.bus = &hsi_bus_type;
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cl->device.parent = &port->device;
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cl->device.release = hsi_client_release;
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dev_set_name(&cl->device, "%s", info->name);
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cl->device.platform_data = info->platform_data;
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if (info->archdata)
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cl->device.archdata = *info->archdata;
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if (device_register(&cl->device) < 0) {
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pr_err("hsi: failed to register client: %s\n", info->name);
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put_device(&cl->device);
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}
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}
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static void hsi_scan_board_info(struct hsi_controller *hsi)
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{
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struct hsi_cl_info *cl_info;
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struct hsi_port *p;
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list_for_each_entry(cl_info, &hsi_board_list, list)
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if (cl_info->info.hsi_id == hsi->id) {
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p = hsi_find_port_num(hsi, cl_info->info.port);
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if (!p)
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continue;
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hsi_new_client(p, &cl_info->info);
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}
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}
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static int hsi_remove_client(struct device *dev, void *data __maybe_unused)
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{
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device_unregister(dev);
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return 0;
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}
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static int hsi_remove_port(struct device *dev, void *data __maybe_unused)
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{
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device_for_each_child(dev, NULL, hsi_remove_client);
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device_unregister(dev);
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return 0;
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}
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static void hsi_controller_release(struct device *dev)
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{
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struct hsi_controller *hsi = to_hsi_controller(dev);
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kfree(hsi->port);
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kfree(hsi);
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}
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static void hsi_port_release(struct device *dev)
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{
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kfree(to_hsi_port(dev));
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}
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/**
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* hsi_unregister_controller - Unregister an HSI controller
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* @hsi: The HSI controller to register
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*/
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void hsi_unregister_controller(struct hsi_controller *hsi)
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{
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device_for_each_child(&hsi->device, NULL, hsi_remove_port);
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device_unregister(&hsi->device);
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}
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EXPORT_SYMBOL_GPL(hsi_unregister_controller);
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/**
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* hsi_register_controller - Register an HSI controller and its ports
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* @hsi: The HSI controller to register
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*
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* Returns -errno on failure, 0 on success.
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*/
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int hsi_register_controller(struct hsi_controller *hsi)
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{
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unsigned int i;
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int err;
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err = device_add(&hsi->device);
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if (err < 0)
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return err;
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for (i = 0; i < hsi->num_ports; i++) {
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hsi->port[i]->device.parent = &hsi->device;
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err = device_add(&hsi->port[i]->device);
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if (err < 0)
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goto out;
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}
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/* Populate HSI bus with HSI clients */
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hsi_scan_board_info(hsi);
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return 0;
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out:
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while (i-- > 0)
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device_del(&hsi->port[i]->device);
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device_del(&hsi->device);
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return err;
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}
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EXPORT_SYMBOL_GPL(hsi_register_controller);
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/**
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* hsi_register_client_driver - Register an HSI client to the HSI bus
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* @drv: HSI client driver to register
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*
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* Returns -errno on failure, 0 on success.
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*/
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int hsi_register_client_driver(struct hsi_client_driver *drv)
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{
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drv->driver.bus = &hsi_bus_type;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(hsi_register_client_driver);
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static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused)
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{
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return 0;
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}
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static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused)
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{
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return 0;
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}
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/**
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* hsi_put_controller - Free an HSI controller
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*
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* @hsi: Pointer to the HSI controller to freed
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*
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* HSI controller drivers should only use this function if they need
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* to free their allocated hsi_controller structures before a successful
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* call to hsi_register_controller. Other use is not allowed.
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*/
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void hsi_put_controller(struct hsi_controller *hsi)
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{
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unsigned int i;
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if (!hsi)
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return;
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for (i = 0; i < hsi->num_ports; i++)
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if (hsi->port && hsi->port[i])
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put_device(&hsi->port[i]->device);
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put_device(&hsi->device);
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}
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EXPORT_SYMBOL_GPL(hsi_put_controller);
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/**
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* hsi_alloc_controller - Allocate an HSI controller and its ports
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* @n_ports: Number of ports on the HSI controller
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* @flags: Kernel allocation flags
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*
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* Return NULL on failure or a pointer to an hsi_controller on success.
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*/
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struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags)
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{
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struct hsi_controller *hsi;
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struct hsi_port **port;
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unsigned int i;
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if (!n_ports)
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return NULL;
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hsi = kzalloc(sizeof(*hsi), flags);
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if (!hsi)
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return NULL;
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port = kzalloc(sizeof(*port)*n_ports, flags);
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if (!port) {
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kfree(hsi);
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return NULL;
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}
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hsi->num_ports = n_ports;
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hsi->port = port;
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hsi->device.release = hsi_controller_release;
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device_initialize(&hsi->device);
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for (i = 0; i < n_ports; i++) {
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port[i] = kzalloc(sizeof(**port), flags);
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if (port[i] == NULL)
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goto out;
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port[i]->num = i;
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port[i]->async = hsi_dummy_msg;
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port[i]->setup = hsi_dummy_cl;
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port[i]->flush = hsi_dummy_cl;
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port[i]->start_tx = hsi_dummy_cl;
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port[i]->stop_tx = hsi_dummy_cl;
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port[i]->release = hsi_dummy_cl;
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mutex_init(&port[i]->lock);
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ATOMIC_INIT_NOTIFIER_HEAD(&port[i]->n_head);
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dev_set_name(&port[i]->device, "port%d", i);
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hsi->port[i]->device.release = hsi_port_release;
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device_initialize(&hsi->port[i]->device);
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}
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return hsi;
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out:
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hsi_put_controller(hsi);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(hsi_alloc_controller);
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/**
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* hsi_free_msg - Free an HSI message
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* @msg: Pointer to the HSI message
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*
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* Client is responsible to free the buffers pointed by the scatterlists.
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*/
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void hsi_free_msg(struct hsi_msg *msg)
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{
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if (!msg)
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return;
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sg_free_table(&msg->sgt);
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kfree(msg);
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}
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EXPORT_SYMBOL_GPL(hsi_free_msg);
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/**
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* hsi_alloc_msg - Allocate an HSI message
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* @nents: Number of memory entries
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* @flags: Kernel allocation flags
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*
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* nents can be 0. This mainly makes sense for read transfer.
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* In that case, HSI drivers will call the complete callback when
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* there is data to be read without consuming it.
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*
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* Return NULL on failure or a pointer to an hsi_msg on success.
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*/
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struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags)
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{
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struct hsi_msg *msg;
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int err;
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msg = kzalloc(sizeof(*msg), flags);
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if (!msg)
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return NULL;
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if (!nents)
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return msg;
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err = sg_alloc_table(&msg->sgt, nents, flags);
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if (unlikely(err)) {
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kfree(msg);
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msg = NULL;
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}
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return msg;
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}
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EXPORT_SYMBOL_GPL(hsi_alloc_msg);
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/**
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* hsi_async - Submit an HSI transfer to the controller
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* @cl: HSI client sending the transfer
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* @msg: The HSI transfer passed to controller
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*
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* The HSI message must have the channel, ttype, complete and destructor
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* fields set beforehand. If nents > 0 then the client has to initialize
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* also the scatterlists to point to the buffers to write to or read from.
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*
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* HSI controllers relay on pre-allocated buffers from their clients and they
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* do not allocate buffers on their own.
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*
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* Once the HSI message transfer finishes, the HSI controller calls the
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* complete callback with the status and actual_len fields of the HSI message
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* updated. The complete callback can be called before returning from
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* hsi_async.
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*
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* Returns -errno on failure or 0 on success
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*/
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int hsi_async(struct hsi_client *cl, struct hsi_msg *msg)
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{
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struct hsi_port *port = hsi_get_port(cl);
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if (!hsi_port_claimed(cl))
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return -EACCES;
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WARN_ON_ONCE(!msg->destructor || !msg->complete);
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msg->cl = cl;
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return port->async(msg);
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}
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EXPORT_SYMBOL_GPL(hsi_async);
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/**
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* hsi_claim_port - Claim the HSI client's port
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* @cl: HSI client that wants to claim its port
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* @share: Flag to indicate if the client wants to share the port or not.
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*
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* Returns -errno on failure, 0 on success.
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*/
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int hsi_claim_port(struct hsi_client *cl, unsigned int share)
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{
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struct hsi_port *port = hsi_get_port(cl);
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int err = 0;
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mutex_lock(&port->lock);
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if ((port->claimed) && (!port->shared || !share)) {
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err = -EBUSY;
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goto out;
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}
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if (!try_module_get(to_hsi_controller(port->device.parent)->owner)) {
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err = -ENODEV;
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goto out;
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}
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port->claimed++;
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port->shared = !!share;
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cl->pclaimed = 1;
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out:
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mutex_unlock(&port->lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(hsi_claim_port);
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/**
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* hsi_release_port - Release the HSI client's port
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* @cl: HSI client which previously claimed its port
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*/
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void hsi_release_port(struct hsi_client *cl)
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{
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struct hsi_port *port = hsi_get_port(cl);
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mutex_lock(&port->lock);
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/* Allow HW driver to do some cleanup */
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port->release(cl);
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if (cl->pclaimed)
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port->claimed--;
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BUG_ON(port->claimed < 0);
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cl->pclaimed = 0;
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if (!port->claimed)
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port->shared = 0;
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module_put(to_hsi_controller(port->device.parent)->owner);
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mutex_unlock(&port->lock);
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}
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EXPORT_SYMBOL_GPL(hsi_release_port);
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static int hsi_event_notifier_call(struct notifier_block *nb,
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unsigned long event, void *data __maybe_unused)
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{
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struct hsi_client *cl = container_of(nb, struct hsi_client, nb);
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(*cl->ehandler)(cl, event);
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return 0;
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}
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/**
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* hsi_register_port_event - Register a client to receive port events
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* @cl: HSI client that wants to receive port events
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* @handler: Event handler callback
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*
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* Clients should register a callback to be able to receive
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* events from the ports. Registration should happen after
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* claiming the port.
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* The handler can be called in interrupt context.
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*
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* Returns -errno on error, or 0 on success.
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*/
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int hsi_register_port_event(struct hsi_client *cl,
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void (*handler)(struct hsi_client *, unsigned long))
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{
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struct hsi_port *port = hsi_get_port(cl);
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if (!handler || cl->ehandler)
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return -EINVAL;
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if (!hsi_port_claimed(cl))
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return -EACCES;
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cl->ehandler = handler;
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cl->nb.notifier_call = hsi_event_notifier_call;
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return atomic_notifier_chain_register(&port->n_head, &cl->nb);
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}
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EXPORT_SYMBOL_GPL(hsi_register_port_event);
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/**
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* hsi_unregister_port_event - Stop receiving port events for a client
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* @cl: HSI client that wants to stop receiving port events
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*
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* Clients should call this function before releasing their associated
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* port.
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*
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* Returns -errno on error, or 0 on success.
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*/
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int hsi_unregister_port_event(struct hsi_client *cl)
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{
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struct hsi_port *port = hsi_get_port(cl);
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int err;
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WARN_ON(!hsi_port_claimed(cl));
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err = atomic_notifier_chain_unregister(&port->n_head, &cl->nb);
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if (!err)
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cl->ehandler = NULL;
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return err;
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}
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EXPORT_SYMBOL_GPL(hsi_unregister_port_event);
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/**
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* hsi_event -Notifies clients about port events
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* @port: Port where the event occurred
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* @event: The event type
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*
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* Clients should not be concerned about wake line behavior. However, due
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* to a race condition in HSI HW protocol, clients need to be notified
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* about wake line changes, so they can implement a workaround for it.
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*
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* Events:
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* HSI_EVENT_START_RX - Incoming wake line high
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* HSI_EVENT_STOP_RX - Incoming wake line down
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*
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* Returns -errno on error, or 0 on success.
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*/
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int hsi_event(struct hsi_port *port, unsigned long event)
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{
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return atomic_notifier_call_chain(&port->n_head, event, NULL);
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}
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EXPORT_SYMBOL_GPL(hsi_event);
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static int __init hsi_init(void)
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{
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return bus_register(&hsi_bus_type);
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}
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postcore_initcall(hsi_init);
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static void __exit hsi_exit(void)
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{
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bus_unregister(&hsi_bus_type);
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}
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module_exit(hsi_exit);
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MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
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MODULE_DESCRIPTION("High-speed Synchronous Serial Interface (HSI) framework");
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MODULE_LICENSE("GPL v2");
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