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md: check the return of mddev_find()

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Check the return of mddev_find(), since it may fail due to out of
memeory or out of usable minor number.

The reason I chose -ENODEV instead of -ENOMEM or something else is
md_alloc() function chose that ;)

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Yuanhan Liu 2012-05-22 13:55:32 +10:00 committed by NeilBrown
parent 4f0a5e012c
commit 0c098220e2
1 changed files with 3 additions and 0 deletions
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3
drivers/md/md.c
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@ -6618,6 +6618,9 @@ static int md_open(struct block_device *bdev, fmode_t mode)
struct mddev *mddev = mddev_find(bdev->bd_dev);
int err;
if (!mddev)
return -ENODEV;
if (mddev->gendisk != bdev->bd_disk) {
/* we are racing with mddev_put which is discarding this
* bd_disk.