6.14-stable review patch. If anyone has any objections, please let me know.
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From: Guixin Liu kanie@linux.alibaba.com
[ Upstream commit 1909b643034ef741af9f24a57ab735440c4b5d1a ]
When the tcm_loop_nr_hw_queues is set to a value greater than 1, the tags of requests in the block layer are no longer unique. This may lead to erroneous aborting of commands with the same tag. The issue can be resolved by using blk_mq_unique_tag to generate globally unique identifiers by combining the hardware queue index and per-queue tags.
Fixes: 6375f8908255 ("tcm_loop: Fixup tag handling") Signed-off-by: Guixin Liu kanie@linux.alibaba.com Link: https://lore.kernel.org/r/20250313014728.105849-1-kanie@linux.alibaba.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/target/loopback/tcm_loop.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c index 761c511aea07c..c7b7da6297418 100644 --- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -176,7 +176,7 @@ static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
memset(tl_cmd, 0, sizeof(*tl_cmd)); tl_cmd->sc = sc; - tl_cmd->sc_cmd_tag = scsi_cmd_to_rq(sc)->tag; + tl_cmd->sc_cmd_tag = blk_mq_unique_tag(scsi_cmd_to_rq(sc));
tcm_loop_target_queue_cmd(tl_cmd); return 0; @@ -242,7 +242,8 @@ static int tcm_loop_abort_task(struct scsi_cmnd *sc) tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, - scsi_cmd_to_rq(sc)->tag, TMR_ABORT_TASK); + blk_mq_unique_tag(scsi_cmd_to_rq(sc)), + TMR_ABORT_TASK); return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; }