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devm-helpers: Add resource managed version of work init 

A few drivers which need a work-queue must cancel work at driver detach.
Some of those implement remove() solely for this purpose. Help drivers to
avoid unnecessary remove and error-branch implementation by adding managed
verision of work initialization. This will also help drivers to avoid
mixing manual and devm based unwinding when other resources are handled by
devm.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/94ff4175e7f2ff134ed2fa7d6e7641005cc9784b.1623146580.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Matti Vaittinen 2021-06-08 13:09:34 +03:00 committed by Hans de Goede
parent 6efb943b86
commit 7a2c4cc537
1 changed files with 25 additions and 0 deletions
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25
include/linux/devm-helpers.h
View File

@ -51,4 +51,29 @@ static inline int devm_delayed_work_autocancel(struct device *dev,
return devm_add_action(dev, devm_delayed_work_drop, w);
}
static inline void devm_work_drop(void *res)
{
cancel_work_sync(res);
}
/**
* devm_work_autocancel - Resource-managed work allocation
* @dev: Device which lifetime work is bound to
* @w: Work to be added (and automatically cancelled)
* @worker: Worker function
*
* Initialize work which is automatically cancelled when driver is detached.
* A few drivers need to queue work which must be cancelled before driver
* is detached to avoid accessing removed resources.
* devm_work_autocancel() can be used to omit the explicit
* cancelleation when driver is detached.
*/
static inline int devm_work_autocancel(struct device *dev,
struct work_struct *w,
work_func_t worker)
{
INIT_WORK(w, worker);
return devm_add_action(dev, devm_work_drop, w);
}
#endif