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skd: Make it easier for static analyzers to analyze skd_free_disk() 

Although it is easy to see that skdev->disk != NULL if skdev->queue
!= NULL, add a test for skdev->disk to avoid that smatch reports the
following warning:

drivers/block/skd_main.c:3080 skd_free_disk()
         error: we previously assumed 'disk' could be null (see line 3074)

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2017-08-25 14:24:13 -07:00 committed by Jens Axboe
parent 795bc1b542
commit 4633504c1a
1 changed files with 2 additions and 1 deletions
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3
drivers/block/skd_main.c
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@ -3041,7 +3041,8 @@ static void skd_free_disk(struct skd_device *skdev)
if (skdev->queue) {
blk_cleanup_queue(skdev->queue);
skdev->queue = NULL;
disk->queue = NULL;
if (disk)
disk->queue = NULL;
}
if (skdev->tag_set.tags)