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sysfs: make bin attr open get active reference of parent too 

All bin attr operations require active references of itself and its
parent.  There's no reason to allow open when its parent has been
deactivated and allowing it is inconsistent with regular sysfs file.
Use sysfs_get_active_two() in bin attribute open function.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo 2007-09-20 16:05:10 +09:00 committed by Greg Kroah-Hartman
parent 50ab1a7286
commit 078ce6409c
1 changed files with 5 additions and 5 deletions
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10
fs/sysfs/bin.c
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@ -171,8 +171,8 @@ static int open(struct inode * inode, struct file * file)
struct bin_buffer *bb = NULL;
int error;
/* need attr_sd for attr */
if (!sysfs_get_active(attr_sd))
/* binary file operations requires both @sd and its parent */
if (!sysfs_get_active_two(attr_sd))
return -ENODEV;
error = -EACCES;
@ -193,12 +193,12 @@ static int open(struct inode * inode, struct file * file)
mutex_init(&bb->mutex);
file->private_data = bb;
/* open succeeded, put active reference */
sysfs_put_active(attr_sd);
/* open succeeded, put active references */
sysfs_put_active_two(attr_sd);
return 0;
err_out:
sysfs_put_active(attr_sd);
sysfs_put_active_two(attr_sd);
kfree(bb);
return error;
}