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watchdog: clarify that stop() is optional 

The commit d0684c8a93 ("watchdog: Make stop function optional")
made stop function not mandatory, but the comments
and the doc weren't reflected. Fix it to clarify.

Signed-off-by: Bumsik Kim <k.bumsik@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200403031507.63487-1-k.bumsik@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Bumsik Kim 2020-04-03 12:15:07 +09:00 committed by Jonathan Corbet
parent fc965497d5
commit 4951d27b09
3 changed files with 4 additions and 4 deletions
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2
Documentation/watchdog/convert_drivers_to_kernel_api.rst
View File

@ -115,7 +115,7 @@ Add the watchdog operations
---------------------------
All possible callbacks are defined in 'struct watchdog_ops'. You can find it
explained in 'watchdog-kernel-api.txt' in this directory. start(), stop() and
explained in 'watchdog-kernel-api.txt' in this directory. start() and
owner must be set, the rest are optional. You will easily find corresponding
functions in the old driver. Note that you will now get a pointer to the
watchdog_device as a parameter to these functions, so you probably have to

2
Documentation/watchdog/watchdog-kernel-api.rst
View File

@ -123,8 +123,8 @@ The list of watchdog operations is defined as::
struct module *owner;
/* mandatory operations */
int (*start)(struct watchdog_device *);
int (*stop)(struct watchdog_device *);
/* optional operations */
int (*stop)(struct watchdog_device *);
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);

4
include/linux/watchdog.h
View File

@ -37,15 +37,15 @@ struct watchdog_governor;
*
* The watchdog_ops structure contains a list of low-level operations
* that control a watchdog device. It also contains the module that owns
* these operations. The start and stop function are mandatory, all other
* these operations. The start function is mandatory, all other
* functions are optional.
*/
struct watchdog_ops {
struct module *owner;
/* mandatory operations */
int (*start)(struct watchdog_device *);
int (*stop)(struct watchdog_device *);
/* optional operations */
int (*stop)(struct watchdog_device *);
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);