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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull final block fixes from Jens Axboe:
"This week and last we've been fixing some corner cases related to
blk-mq, mostly. I ended up pulling most of that out of for-linus
yesterday, which is why the branch looks fresh. The rest were
postponed for 3.18.
This pull request contains:
- Fix from Christoph, avoiding a stack overflow when FUA insertion
would recursive infinitely.
- Fix from David Hildenbrand on races between the timeout handler and
uninitialized requests. Fixes a real issue that virtio_blk has run
into.
- A few fixes from me:
- Ensure that request deadline/timeout is ordered before the
request is marked as started.
- A potential oops on out-of-memory, when we scale the queue
depth of the device and retry.
- A hang fix on requeue from SCSI, where the hardware queue
would be stopped when we attempt to re-run it (and hence
nothing would happen, stalling progress).
- A fix for commit 2da78092
, where the cleanup path was moved
to RCU, but a debug might_sleep() was inadvertently left in
the code. This causes warnings for people"
* 'for-linus' of git://git.kernel.dk/linux-block:
genhd: fix leftover might_sleep() in blk_free_devt()
blk-mq: use blk_mq_start_hw_queues() when running requeue work
blk-mq: fix potential oops on out-of-memory in __blk_mq_alloc_rq_maps()
blk-mq: avoid infinite recursion with the FUA flag
blk-mq: Avoid race condition with uninitialized requests
blk-mq: request deadline must be visible before marking rq as started
This commit is contained in:
commit
31f9bf46a5
@ -56,6 +56,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
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bool is_pm_resume;
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WARN_ON(irqs_disabled());
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WARN_ON(rq->cmd_type == REQ_TYPE_FS);
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rq->rq_disk = bd_disk;
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rq->end_io = done;
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@ -203,7 +203,6 @@ __blk_mq_alloc_request(struct blk_mq_alloc_data *data, int rw)
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if (tag != BLK_MQ_TAG_FAIL) {
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rq = data->hctx->tags->rqs[tag];
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rq->cmd_flags = 0;
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if (blk_mq_tag_busy(data->hctx)) {
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rq->cmd_flags = REQ_MQ_INFLIGHT;
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atomic_inc(&data->hctx->nr_active);
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@ -258,6 +257,7 @@ static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,
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if (rq->cmd_flags & REQ_MQ_INFLIGHT)
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atomic_dec(&hctx->nr_active);
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rq->cmd_flags = 0;
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clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags);
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blk_mq_put_tag(hctx, tag, &ctx->last_tag);
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@ -392,6 +392,12 @@ static void blk_mq_start_request(struct request *rq, bool last)
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blk_add_timer(rq);
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/*
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* Ensure that ->deadline is visible before set the started
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* flag and clear the completed flag.
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*/
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smp_mb__before_atomic();
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/*
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* Mark us as started and clear complete. Complete might have been
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* set if requeue raced with timeout, which then marked it as
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@ -473,7 +479,11 @@ static void blk_mq_requeue_work(struct work_struct *work)
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blk_mq_insert_request(rq, false, false, false);
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}
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blk_mq_run_queues(q, false);
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/*
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* Use the start variant of queue running here, so that running
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* the requeue work will kick stopped queues.
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*/
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blk_mq_start_hw_queues(q);
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}
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void blk_mq_add_to_requeue_list(struct request *rq, bool at_head)
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@ -957,14 +967,9 @@ void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue,
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hctx = q->mq_ops->map_queue(q, ctx->cpu);
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if (rq->cmd_flags & (REQ_FLUSH | REQ_FUA) &&
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!(rq->cmd_flags & (REQ_FLUSH_SEQ))) {
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blk_insert_flush(rq);
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} else {
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spin_lock(&ctx->lock);
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__blk_mq_insert_request(hctx, rq, at_head);
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spin_unlock(&ctx->lock);
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}
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spin_lock(&ctx->lock);
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__blk_mq_insert_request(hctx, rq, at_head);
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spin_unlock(&ctx->lock);
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if (run_queue)
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blk_mq_run_hw_queue(hctx, async);
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@ -1404,6 +1409,8 @@ static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
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left -= to_do * rq_size;
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for (j = 0; j < to_do; j++) {
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tags->rqs[i] = p;
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tags->rqs[i]->atomic_flags = 0;
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tags->rqs[i]->cmd_flags = 0;
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if (set->ops->init_request) {
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if (set->ops->init_request(set->driver_data,
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tags->rqs[i], hctx_idx, i,
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@ -1956,7 +1963,6 @@ out_unwind:
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while (--i >= 0)
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blk_mq_free_rq_map(set, set->tags[i], i);
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set->tags = NULL;
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return -ENOMEM;
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}
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@ -445,8 +445,6 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
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*/
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void blk_free_devt(dev_t devt)
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{
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might_sleep();
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if (devt == MKDEV(0, 0))
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return;
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