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rbd: drop dev reference on error in rbd_open()

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If a read-only rbd device is opened for writing in rbd_open(), it
returns without dropping the just-acquired device reference.

Fix this by moving the read-only check before getting the reference.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 340c7a2b2c)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Elder 2012-08-10 13:12:07 -07:00 committed by Greg Kroah-Hartman
parent 2c130889f5
commit a871375b55
1 changed files with 3 additions and 4 deletions
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7
drivers/block/rbd.c
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@ -250,13 +250,12 @@ static int rbd_open(struct block_device *bdev, fmode_t mode)
{
struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
rbd_get_dev(rbd_dev);
set_device_ro(bdev, rbd_dev->read_only);
if ((mode & FMODE_WRITE) && rbd_dev->read_only)
return -EROFS;
rbd_get_dev(rbd_dev);
set_device_ro(bdev, rbd_dev->read_only);
return 0;
}