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pktcdvd: Fix pkt_setup_dev() error path 

commit 5a0ec388ef upstream.

Commit 523e1d399c ("block: make gendisk hold a reference to its queue")
modified add_disk() and disk_release() but did not update any of the
error paths that trigger a put_disk() call after disk->queue has been
assigned. That introduced the following behavior in the pktcdvd driver
if pkt_new_dev() fails:

Kernel BUG at 00000000e98fd882 [verbose debug info unavailable]

Since disk_release() calls blk_put_queue() anyway if disk->queue != NULL,
fix this by removing the blk_cleanup_queue() call from the pkt_setup_dev()
error path.

Fixes: commit 523e1d399c ("block: make gendisk hold a reference to its queue")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Bart Van Assche 2018-01-02 11:39:47 -08:00 committed by Greg Kroah-Hartman
parent f04fe1192e
commit 030dcf7d1a
1 changed files with 1 additions and 3 deletions
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4
drivers/block/pktcdvd.c
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@ -2745,7 +2745,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
pd->pkt_dev = MKDEV(pktdev_major, idx);
ret = pkt_new_dev(pd, dev);
if (ret)
goto out_new_dev;
goto out_mem2;
/* inherit events of the host device */
disk->events = pd->bdev->bd_disk->events;
@ -2763,8 +2763,6 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
mutex_unlock(&ctl_mutex);
return 0;
out_new_dev:
blk_cleanup_queue(disk->queue);
out_mem2:
put_disk(disk);
out_mem: