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cdev: allow to open a struct cdev 

cdev_open() opens a cdev by name. This introduces cdev_do_open which
allows to open a cdev when the cdev is already found by other means.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-07-10 08:48:00 +02:00
parent bec70b3aaa
commit 2672c906a4
2 changed files with 12 additions and 5 deletions
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16
fs/devfs-core.c
View File

@ -70,6 +70,14 @@ int cdev_find_free_index(const char *basename)
return -EBUSY; /* all indexes are used */
}
int cdev_do_open(struct cdev *cdev, unsigned long flags)
{
if (cdev->ops->open)
return cdev->ops->open(cdev, flags);
return 0;
}
struct cdev *cdev_open(const char *name, unsigned long flags)
{
struct cdev *cdev = cdev_by_name(name);
@ -78,11 +86,9 @@ struct cdev *cdev_open(const char *name, unsigned long flags)
if (!cdev)
return NULL;
if (cdev->ops->open) {
ret = cdev->ops->open(cdev, flags);
if (ret)
return NULL;
}
ret = cdev_do_open(cdev, flags);
if (ret)
return NULL;
return cdev;
}

1
include/driver.h
View File

@ -460,6 +460,7 @@ int devfs_remove(struct cdev *);
int cdev_find_free_index(const char *);
struct cdev *cdev_by_name(const char *filename);
struct cdev *cdev_open(const char *name, unsigned long flags);
int cdev_do_open(struct cdev *, unsigned long flags);
void cdev_close(struct cdev *cdev);
int cdev_flush(struct cdev *cdev);
ssize_t cdev_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags);