[PATCH v4 5/5] scsi: set shost as hctx driver_data

[Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>]

hctx->driver_data is not set for SCSI currently.
Separately set hctx->driver_data = shost.

Suggested-by: John Garry <john.garry@xxxxxxxxxx>
Signed-off-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Reviewed-by: John Garry <john.garry@xxxxxxxxxx>
---
 drivers/scsi/scsi_lib.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 8c29bf0e4cfd..f661c50f3b88 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1792,9 +1792,7 @@ static void scsi_mq_exit_request(struct blk_mq_tag_set *set, struct request *rq,
 
 static int scsi_mq_poll(struct blk_mq_hw_ctx *hctx)
 {
-	struct request_queue *q = hctx->queue;
-	struct scsi_device *sdev = q->queuedata;
-	struct Scsi_Host *shost = sdev->host;
+	struct Scsi_Host *shost = hctx->driver_data;
 
 	if (shost->hostt->mq_poll)
 		return shost->hostt->mq_poll(shost, hctx->queue_num);
@@ -1802,6 +1800,15 @@ static int scsi_mq_poll(struct blk_mq_hw_ctx *hctx)
 	return 0;
 }
 
+static int scsi_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+			  unsigned int hctx_idx)
+{
+	struct Scsi_Host *shost = data;
+
+	hctx->driver_data = shost;
+	return 0;
+}
+
 static int scsi_map_queues(struct blk_mq_tag_set *set)
 {
 	struct Scsi_Host *shost = container_of(set, struct Scsi_Host, tag_set);
@@ -1869,15 +1876,14 @@ static const struct blk_mq_ops scsi_mq_ops_no_commit = {
 	.cleanup_rq	= scsi_cleanup_rq,
 	.busy		= scsi_mq_lld_busy,
 	.map_queues	= scsi_map_queues,
+	.init_hctx	= scsi_init_hctx,
 	.poll		= scsi_mq_poll,
 };
 
 
 static void scsi_commit_rqs(struct blk_mq_hw_ctx *hctx)
 {
-	struct request_queue *q = hctx->queue;
-	struct scsi_device *sdev = q->queuedata;
-	struct Scsi_Host *shost = sdev->host;
+	struct Scsi_Host *shost = hctx->driver_data;
 
 	shost->hostt->commit_rqs(shost, hctx->queue_num);
 }
@@ -1898,6 +1904,7 @@ static const struct blk_mq_ops scsi_mq_ops = {
 	.cleanup_rq	= scsi_cleanup_rq,
 	.busy		= scsi_mq_lld_busy,
 	.map_queues	= scsi_map_queues,
+	.init_hctx	= scsi_init_hctx,
 	.poll		= scsi_mq_poll,
 };
 
-- 
2.18.1

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