scsi: libsas: Add sas_task_find_rq()

[ Upstream commit a9ee3f840646e2ec419c734e592ffe997195435e ]

blk-mq already provides a unique tag per request. Some libsas LLDDs - like
hisi_sas - already use this tag as the unique per-I/O HW tag.

Add a common function to provide the request associated with a sas_task for
all libsas LLDDs.

Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1666091763-11023-2-git-send-email-john.garry@huawei.com
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Stable-dep-of: 60cd16a3b743 ("scsi: mvsas: Fix use-after-free bugs in mvs_work_queue")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 2dbead74a2afeca361f7ffa0c141114f9326e9bf..9e9dff75a02bc01134e3f76d2d2ec46a4e0d61fe 100644 (file)
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -648,6 +648,24 @@ static inline bool sas_is_internal_abort(struct sas_task *task)
        return task->task_proto == SAS_PROTOCOL_INTERNAL_ABORT;
 }
 
+static inline struct request *sas_task_find_rq(struct sas_task *task)
+{
+       struct scsi_cmnd *scmd;
+
+       if (task->task_proto & SAS_PROTOCOL_STP_ALL) {
+               struct ata_queued_cmd *qc = task->uldd_task;
+
+               scmd = qc ? qc->scsicmd : NULL;
+       } else {
+               scmd = task->uldd_task;
+       }
+
+       if (!scmd)
+               return NULL;
+
+       return scsi_cmd_to_rq(scmd);
+}
+
 struct sas_domain_function_template {
        /* The class calls these to notify the LLDD of an event. */
        void (*lldd_port_formed)(struct asd_sas_phy *);