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null_blk: Cleanup error recovery in null_add_dev() 

When creation of queues fails in init_driver_queues(), we free the
queues. But null_add_dev() doesn't test for this failure and continues
with the setup leading to strange consequences, likely oops. Fix the
problem by testing whether init_driver_queues() failed and do proper
error cleanup.

Coverity-id: 1148005
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2014-10-22 15:34:21 +02:00 committed by Jens Axboe
parent 76d8137a31
commit 31f9690e6e
1 changed files with 7 additions and 7 deletions
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14
drivers/block/null_blk.c
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@ -450,14 +450,10 @@ static int init_driver_queues(struct nullb *nullb)
ret = setup_commands(nq);
if (ret)
goto err_queue;
return ret;
nullb->nr_queues++;
}
return 0;
err_queue:
cleanup_queues(nullb);
return ret;
}
static int null_add_dev(void)
@ -507,7 +503,9 @@ static int null_add_dev(void)
goto out_cleanup_queues;
}
blk_queue_make_request(nullb->q, null_queue_bio);
init_driver_queues(nullb);
rv = init_driver_queues(nullb);
if (rv)
goto out_cleanup_blk_queue;
} else {
nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
if (!nullb->q) {
@ -516,7 +514,9 @@ static int null_add_dev(void)
}
blk_queue_prep_rq(nullb->q, null_rq_prep_fn);
blk_queue_softirq_done(nullb->q, null_softirq_done_fn);
init_driver_queues(nullb);
rv = init_driver_queues(nullb);
if (rv)
goto out_cleanup_blk_queue;
}
nullb->q->queuedata = nullb;