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uio: add resource managed devm_uio_register_device() function

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This change adds a resource managed equivalent of uio_register_device().
Not adding devm_uio_unregister_device(), since the intent is to discourage
it's usage. Having such a function may allow some bad driver designs. Most
users of devm_*register*() functions rarely use the unregister equivalents.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20200306161853.25368-1-alexandru.ardelean@analog.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandru Ardelean 2020-03-06 18:18:52 +02:00 committed by Greg Kroah-Hartman
parent 05d67ec3ca
commit 86a78b1cfc
2 changed files with 47 additions and 0 deletions
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38
drivers/uio/uio.c
View File

@ -996,6 +996,44 @@ err_device_create:
}
EXPORT_SYMBOL_GPL(__uio_register_device);
static void devm_uio_unregister_device(struct device *dev, void *res)
{
uio_unregister_device(*(struct uio_info **)res);
}
/**
* devm_uio_register_device - Resource managed uio_register_device()
* @owner: module that creates the new device
* @parent: parent device
* @info: UIO device capabilities
*
* returns zero on success or a negative error code.
*/
int __devm_uio_register_device(struct module *owner,
struct device *parent,
struct uio_info *info)
{
struct uio_info **ptr;
int ret;
ptr = devres_alloc(devm_uio_unregister_device, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
*ptr = info;
ret = __uio_register_device(owner, parent, info);
if (ret) {
devres_free(ptr);
return ret;
}
devres_add(parent, ptr);
return 0;
}
EXPORT_SYMBOL_GPL(__devm_uio_register_device);
/**
* uio_unregister_device - unregister a industrial IO device
* @info: UIO device capabilities

9
include/linux/uio_driver.h
View File

@ -123,6 +123,15 @@ extern int __must_check
extern void uio_unregister_device(struct uio_info *info);
extern void uio_event_notify(struct uio_info *info);
extern int __must_check
__devm_uio_register_device(struct module *owner,
struct device *parent,
struct uio_info *info);
/* use a define to avoid include chaining to get THIS_MODULE */
#define devm_uio_register_device(parent, info) \
__devm_uio_register_device(THIS_MODULE, parent, info)
/* defines for uio_info->irq */
#define UIO_IRQ_CUSTOM -1
#define UIO_IRQ_NONE 0