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mailbox: Add device-managed registration functions 

Add device-managed equivalents of the mbox_controller_register() and
mbox_controller_unregister() functions that can be used to have the
devres infrastructure automatically unregister mailbox controllers on
driver probe failure or driver removal. This can help remove a lot of
boiler plate code from drivers.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Thierry Reding 2018-12-20 18:19:44 +01:00 committed by Jassi Brar
parent e2affdbef2
commit e898d9cdd3
2 changed files with 75 additions and 0 deletions
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70
drivers/mailbox/mailbox.c
View File

@ -515,3 +515,73 @@ void mbox_controller_unregister(struct mbox_controller *mbox)
mutex_unlock(&con_mutex);
}
EXPORT_SYMBOL_GPL(mbox_controller_unregister);
static void __devm_mbox_controller_unregister(struct device *dev, void *res)
{
struct mbox_controller **mbox = res;
mbox_controller_unregister(*mbox);
}
static int devm_mbox_controller_match(struct device *dev, void *res, void *data)
{
struct mbox_controller **mbox = res;
if (WARN_ON(!mbox || !*mbox))
return 0;
return *mbox == data;
}
/**
* devm_mbox_controller_register() - managed mbox_controller_register()
* @dev: device owning the mailbox controller being registered
* @mbox: mailbox controller being registered
*
* This function adds a device-managed resource that will make sure that the
* mailbox controller, which is registered using mbox_controller_register()
* as part of this function, will be unregistered along with the rest of
* device-managed resources upon driver probe failure or driver removal.
*
* Returns 0 on success or a negative error code on failure.
*/
int devm_mbox_controller_register(struct device *dev,
struct mbox_controller *mbox)
{
struct mbox_controller **ptr;
int err;
ptr = devres_alloc(__devm_mbox_controller_unregister, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
err = mbox_controller_register(mbox);
if (err < 0) {
devres_free(ptr);
return err;
}
devres_add(dev, ptr);
*ptr = mbox;
return 0;
}
EXPORT_SYMBOL_GPL(devm_mbox_controller_register);
/**
* devm_mbox_controller_unregister() - managed mbox_controller_unregister()
* @dev: device owning the mailbox controller being unregistered
* @mbox: mailbox controller being unregistered
*
* This function unregisters the mailbox controller and removes the device-
* managed resource that was set up to automatically unregister the mailbox
* controller on driver probe failure or driver removal. It's typically not
* necessary to call this function.
*/
void devm_mbox_controller_unregister(struct device *dev, struct mbox_controller *mbox)
{
WARN_ON(devres_release(dev, __devm_mbox_controller_unregister,
devm_mbox_controller_match, mbox));
}
EXPORT_SYMBOL_GPL(devm_mbox_controller_unregister);

5
include/linux/mailbox_controller.h
View File

@ -131,4 +131,9 @@ void mbox_controller_unregister(struct mbox_controller *mbox); /* can sleep */
void mbox_chan_received_data(struct mbox_chan *chan, void *data); /* atomic */
void mbox_chan_txdone(struct mbox_chan *chan, int r); /* atomic */
int devm_mbox_controller_register(struct device *dev,
struct mbox_controller *mbox);
void devm_mbox_controller_unregister(struct device *dev,
struct mbox_controller *mbox);
#endif /* __MAILBOX_CONTROLLER_H */