5.4-stable review patch. If anyone has any objections, please let me know.
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From: John Garry john.garry@huawei.com
[ 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@huawe... 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 --- include/scsi/libsas.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h index 4e2d61e8fb1ed..8461fad88a119 100644 --- a/include/scsi/libsas.h +++ b/include/scsi/libsas.h @@ -620,6 +620,24 @@ extern struct sas_task *sas_alloc_task(gfp_t flags); extern struct sas_task *sas_alloc_slow_task(gfp_t flags); extern void sas_free_task(struct sas_task *task);
+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 *);