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um-ubd: Entrust re-queue to the upper layers 

Fixes crashes due to ubd requeue logic conflicting with the block-mq
logic. Crash is reproducible in 5.0 - 5.3.

Fixes: 53766defb8 ("um: Clean-up command processing in UML UBD driver")
Cc: stable@vger.kernel.org # v5.0+
Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Anton Ivanov 2019-10-29 09:13:34 +00:00 committed by Jens Axboe
parent 86cccfbf77
commit d848074b2f
1 changed files with 6 additions and 2 deletions
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8
arch/um/drivers/ubd_kern.c
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@ -1403,8 +1403,12 @@ static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
spin_unlock_irq(&ubd_dev->lock);
if (ret < 0)
blk_mq_requeue_request(req, true);
if (ret < 0) {
if (ret == -ENOMEM)
res = BLK_STS_RESOURCE;
else
res = BLK_STS_DEV_RESOURCE;
}
return res;
}