linux-kernel - [PATCH 3/5] ublk: get ubq from pdu in ublk_cmd_list_tw

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Message-ID: <20250328180411.2696494-4-csander@purestorage.com>
Date: Fri, 28 Mar 2025 12:04:09 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Ming Lei <ming.lei@...hat.com>,
	Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH 3/5] ublk: get ubq from pdu in ublk_cmd_list_tw_cb()

Save a few pointer dereferences by obtaining struct ublk_queue *ubq from
the ublk_uring_cmd_pdu instead of the request's mq_hctx.

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 drivers/block/ublk_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 8b9780c0feab..9276d1fcc100 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -1285,11 +1285,11 @@ static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq)
 static void ublk_cmd_list_tw_cb(struct io_uring_cmd *cmd,
 		unsigned int issue_flags)
 {
 	struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
 	struct request *rq = pdu->req_list;
-	struct ublk_queue *ubq = rq->mq_hctx->driver_data;
+	struct ublk_queue *ubq = pdu->ubq;
 	struct request *next;
 
 	do {
 		next = rq->rq_next;
 		rq->rq_next = NULL;
-- 
2.45.2