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USB: usb-skeleton.c: fix compilation error and restored kref_put on fail in skel_open 

Fixing compilaton error.
Incrementing usage counter only on successful execution of skel_open.
Removing redundant locking

Some last changes in function skel_open and finally commit
52a7499 Revert "USB: usb-skeleton.c: fix open/disconnect race"
introduced a bug in function skel_open, which this patch fixes.

Changes since v2:
- refactoring
- Removing redundant mutex synchronization.

Changes since v1:
- Fixed accordingly feedback of Oliver Neukum oneukum@suse.de: also need to drop the lock.

Signed-off-by: Constantine Shulyupin <const@MakeLinux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Constantine Shulyupin 2012-10-10 16:14:00 +02:00 committed by Greg Kroah-Hartman
parent 801f006335
commit e8cebb9cde
1 changed files with 4 additions and 9 deletions
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13
drivers/usb/usb-skeleton.c
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@ -105,20 +105,15 @@ static int skel_open(struct inode *inode, struct file *file)
goto exit;
}
retval = usb_autopm_get_interface(interface);
if (retval)
goto exit;
/* increment our usage count for the device */
kref_get(&dev->kref);
/* lock the device to allow correctly handling errors
* in resumption */
mutex_lock(&dev->io_mutex);
retval = usb_autopm_get_interface(interface);
if (retval)
goto out_err;
/* save our object in the file's private structure */
file->private_data = dev;
mutex_unlock(&dev->io_mutex);
exit:
return retval;