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From 0254e953537c92df3e7d0176f401a211e944fd61 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Sun, 3 Jan 2016 15:11:58 -0800
Subject: watchdog: Drop pointer to watchdog device from struct watchdog_device
The lifetime of the watchdog device pointer is different from the lifetime
of its character device. Remove it entirely to avoid race conditions.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
---
Documentation/watchdog/watchdog-kernel-api.txt | 2 --
drivers/watchdog/watchdog_core.c | 8 ++++----
drivers/watchdog/watchdog_dev.c | 9 ++++-----
include/linux/watchdog.h | 2 --
4 files changed, 8 insertions(+), 13 deletions(-)
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -44,7 +44,6 @@ The watchdog device structure looks like
struct watchdog_device {
int id;
- struct device *dev;
struct device *parent;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
@@ -65,7 +64,6 @@ It contains following fields:
/dev/watchdog0 cdev (dynamic major, minor 0) as well as the old
/dev/watchdog miscdev. The id is set automatically when calling
watchdog_register_device.
-* dev: device under the watchdog class (created by watchdog_register_device).
* parent: set this to the parent device (or NULL) before calling
watchdog_register_device.
* info: a pointer to a watchdog_info structure. This structure gives some
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -249,8 +249,8 @@ static int __watchdog_register_device(st
ret = register_reboot_notifier(&wdd->reboot_nb);
if (ret) {
- dev_err(wdd->dev, "Cannot register reboot notifier (%d)\n",
- ret);
+ pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
+ wdd->id, ret);
watchdog_dev_unregister(wdd);
ida_simple_remove(&watchdog_ida, wdd->id);
return ret;
@@ -262,8 +262,8 @@ static int __watchdog_register_device(st
ret = register_restart_handler(&wdd->restart_nb);
if (ret)
- dev_warn(wdd->dev, "Cannot register restart handler (%d)\n",
- ret);
+ pr_warn("watchog%d: Cannot register restart handler (%d)\n",
+ wdd->id, ret);
}
return 0;
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -143,7 +143,8 @@ static int watchdog_stop(struct watchdog
return 0;
if (test_bit(WDOG_NO_WAY_OUT, &wdd->status)) {
- dev_info(wdd->dev, "nowayout prevents watchdog being stopped!\n");
+ pr_info("watchdog%d: nowayout prevents watchdog being stopped!\n",
+ wdd->id);
return -EBUSY;
}
@@ -604,7 +605,7 @@ static int watchdog_release(struct inode
/* If the watchdog was not stopped, send a keepalive ping */
if (err < 0) {
- dev_crit(wdd->dev, "watchdog did not stop!\n");
+ pr_crit("watchdog%d: watchdog did not stop!\n", wdd->id);
watchdog_ping(wdd);
}
@@ -750,7 +751,6 @@ int watchdog_dev_register(struct watchdo
watchdog_cdev_unregister(wdd);
return PTR_ERR(dev);
}
- wdd->dev = dev;
return ret;
}
@@ -765,8 +765,7 @@ int watchdog_dev_register(struct watchdo
void watchdog_dev_unregister(struct watchdog_device *wdd)
{
- device_destroy(&watchdog_class, wdd->dev->devt);
- wdd->dev = NULL;
+ device_destroy(&watchdog_class, wdd->wd_data->cdev.dev);
watchdog_cdev_unregister(wdd);
}
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -55,7 +55,6 @@ struct watchdog_ops {
/** struct watchdog_device - The structure that defines a watchdog device
*
* @id: The watchdog's ID. (Allocated by watchdog_register_device)
- * @dev: The device for our watchdog
* @parent: The parent bus device
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
@@ -82,7 +81,6 @@ struct watchdog_ops {
*/
struct watchdog_device {
int id;
- struct device *dev;
struct device *parent;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
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