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| author | Christoph Hellwig <hch@lst.de> | 2014-09-13 16:40:09 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-22 12:00:07 -0600 |
| commit | e2490073cd7c3d6f6ef6e029a208edd4d38efac4 (patch) | |
| tree | 48465e67b335f6d696d698641365b4a4d1e89d32 /drivers | |
| parent | bf57229745f849e500ba69ff91e35bc8160a7373 (diff) | |
| download | linux-stable-e2490073cd7c3d6f6ef6e029a208edd4d38efac4.tar.gz linux-stable-e2490073cd7c3d6f6ef6e029a208edd4d38efac4.tar.bz2 linux-stable-e2490073cd7c3d6f6ef6e029a208edd4d38efac4.zip | |
blk-mq: call blk_mq_start_request from ->queue_rq
When we call blk_mq_start_request from the core blk-mq code before calling into
->queue_rq there is a racy window where the timeout handler can hit before we've
fully set up the driver specific part of the command.
Move the call to blk_mq_start_request into the driver so the driver can start
the request only once it is fully set up.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/mtip32xx/mtip32xx.c | 2 | ||||
| -rw-r--r-- | drivers/block/null_blk.c | 2 | ||||
| -rw-r--r-- | drivers/block/virtio_blk.c | 2 | ||||
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 1 |
4 files changed, 7 insertions, 0 deletions
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index 0e2084f37c67..4042440a0470 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -3783,6 +3783,8 @@ static int mtip_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *rq, if (unlikely(mtip_check_unal_depth(hctx, rq))) return BLK_MQ_RQ_QUEUE_BUSY; + blk_mq_start_request(rq); + ret = mtip_submit_request(hctx, rq); if (likely(!ret)) return BLK_MQ_RQ_QUEUE_OK; diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index c5b7315c2c13..332ce20d45da 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -321,6 +321,8 @@ static int null_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *rq, cmd->rq = rq; cmd->nq = hctx->driver_data; + blk_mq_start_request(rq); + null_handle_cmd(cmd); return BLK_MQ_RQ_QUEUE_OK; } diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 13756e016797..83816bf6882f 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -205,6 +205,8 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req, } } + blk_mq_start_request(req); + num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg); if (num) { if (rq_data_dir(vbr->req) == WRITE) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index f1df41168391..2dcd9078de48 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1890,6 +1890,7 @@ static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req, scsi_init_cmd_errh(cmd); cmd->scsi_done = scsi_mq_done; + blk_mq_start_request(req); reason = scsi_dispatch_cmd(cmd); if (reason) { scsi_set_blocked(cmd, reason); |