diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/009-7-watchdog-Drop-pointer-to-watchdog-device-from-struct-watchdog_device.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.4/009-7-watchdog-Drop-pointer-to-watchdog-device-from-struct-watchdog_device.patch | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.4/009-7-watchdog-Drop-pointer-to-watchdog-device-from-struct-watchdog_device.patch b/target/linux/ipq806x/patches-4.4/009-7-watchdog-Drop-pointer-to-watchdog-device-from-struct-watchdog_device.patch new file mode 100644 index 0000000000..9640cd4757 --- /dev/null +++ b/target/linux/ipq806x/patches-4.4/009-7-watchdog-Drop-pointer-to-watchdog-device-from-struct-watchdog_device.patch @@ -0,0 +1,117 @@ +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; |