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watchdog: Add support for creating driver specific sysfs attributes

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The Zodiac watchdog driver attaches additional sysfs attributes to the
watchdog device. This has a number of problems: The watchdog device
lifetime differs from the driver lifetime, and the device structure
should therefore not be accessed from drivers. Also, creating sysfs
attributes after driver registration results in a potential race condition
if user space expects the attributes to exist but they don't exist yet.

Add support for creating driver specific sysfs attributes to the watchdog
core to solve the problems.

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>
This commit is contained in:
Guenter Roeck 2016-01-03 15:11:56 -08:00 • committed by Wim Van Sebroeck
parent 62cd1c40ce
commit faa584757b
3 changed files with 9 additions and 2 deletions
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3
include/linux/watchdog.h
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@ -55,6 +55,8 @@ struct watchdog_ops {
* @id: The watchdog's ID. (Allocated by watchdog_register_device)
* @dev: The device for our watchdog
* @parent: The parent bus device
* @groups: List of sysfs attribute groups to create when creating the
* watchdog device.
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
* @bootstatus: Status of the watchdog device at boot.
@ -82,6 +84,7 @@ struct watchdog_device {
int id;
struct device *dev;
struct device *parent;
const struct attribute_group **groups;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;