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author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-08-23 19:56:32 +0200 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2017-08-23 20:02:34 +0200 |
commit | f2fe445986c8c53d2c324062f2e2c34263cd79a1 (patch) | |
tree | 87289aeccf707a7a0d009f1c99c9e475139831b9 | |
parent | skd: Inline skd_process_request() (diff) | |
download | linux-f2fe445986c8c53d2c324062f2e2c34263cd79a1.tar.xz linux-f2fe445986c8c53d2c324062f2e2c34263cd79a1.zip |
skd: Avoid double completions in case of a timeout
Avoid that normal request completion and the timeout handler can
run concurrently by calling blk_mq_complete_request() instead of
blk_mq_end_request() from skd_end_request(). Avoid that the block
layer can reuse a request while the firmware is still processing
it. Convert skd_softirq_done() to blk-mq. Pass the pointer to
skd_softirq_done() to the block layer core through
blk_mq_ops.complete instead of by calling blk_queue_softirq_done().
Pass the pointer to skd_timed_out() to the block layer core
through blk_mq_ops.timeout instead of by calling
blk_queue_timed_out(). The timeout handler has been tested as
follows:
echo 1 > /sys/block/skd0/io-timeout-fail &&
(cd /sys/kernel/debug/fail_io_timeout &&
echo 100 > probability &&
echo N > task-filter &&
echo 1 > times)
Fixes: commit a74d5b76fab9 ("skd: Switch to block layer timeout mechanism")
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.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>
-rw-r--r-- | drivers/block/skd_main.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c index 0d6340884009..ff288f1a5dec 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -184,6 +184,7 @@ struct skd_request_context { struct fit_comp_error_info err_info; + blk_status_t status; }; struct skd_special_context { @@ -596,19 +597,22 @@ static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx, return BLK_STS_OK; } -static enum blk_eh_timer_return skd_timed_out(struct request *req) +static enum blk_eh_timer_return skd_timed_out(struct request *req, + bool reserved) { struct skd_device *skdev = req->q->queuedata; dev_err(&skdev->pdev->dev, "request with tag %#x timed out\n", blk_mq_unique_tag(req)); - return BLK_EH_HANDLED; + return BLK_EH_RESET_TIMER; } static void skd_end_request(struct skd_device *skdev, struct request *req, blk_status_t error) { + struct skd_request_context *skreq = blk_mq_rq_to_pdu(req); + if (unlikely(error)) { char *cmd = (rq_data_dir(req) == READ) ? "read" : "write"; u32 lba = (u32)blk_rq_pos(req); @@ -621,19 +625,15 @@ static void skd_end_request(struct skd_device *skdev, struct request *req, dev_dbg(&skdev->pdev->dev, "id=0x%x error=%d\n", req->tag, error); - blk_mq_end_request(req, error); + skreq->status = error; + blk_mq_complete_request(req); } -/* Only called in case of a request timeout */ static void skd_softirq_done(struct request *req) { - struct skd_device *skdev = req->q->queuedata; struct skd_request_context *skreq = blk_mq_rq_to_pdu(req); - unsigned long flags; - spin_lock_irqsave(&skdev->lock, flags); - skd_end_request(skdev, blk_mq_rq_from_pdu(skreq), BLK_STS_TIMEOUT); - spin_unlock_irqrestore(&skdev->lock, flags); + blk_mq_end_request(req, skreq->status); } static bool skd_preop_sg_list(struct skd_device *skdev, @@ -2821,6 +2821,8 @@ err_out: static const struct blk_mq_ops skd_mq_ops = { .queue_rq = skd_mq_queue_rq, + .complete = skd_softirq_done, + .timeout = skd_timed_out, .init_request = skd_init_request, .exit_request = skd_exit_request, }; @@ -2884,8 +2886,6 @@ static int skd_cons_disk(struct skd_device *skdev) queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q); blk_queue_rq_timeout(q, 8 * HZ); - blk_queue_rq_timed_out(q, skd_timed_out); - blk_queue_softirq_done(q, skd_softirq_done); spin_lock_irqsave(&skdev->lock, flags); dev_dbg(&skdev->pdev->dev, "stopping queue\n"); |