From: peter chang dpf@google.com
[ Upstream commit 7640e1eb8c5de33dafa6c68fd4389214ff9ec1f9 ]
Driver submits all internal requests (like abort_task, event acknowledgment etc.) through inbound queue 0. While submitting those, driver does not acquire any lock and this may lead to a race when there is an I/O request coming in on CPU0 and submitted through inbound queue 0. To avoid this, lock acquisition has been moved to pm8001_mpi_build_cmd(). All command submission will go through this path.
Link: https://lore.kernel.org/r/20201102165528.26510-2-Viswas.G@microchip.com.com Acked-by: Jack Wang jinpu.wang@cloud.ionos.com Signed-off-by: peter chang dpf@google.com Signed-off-by: Viswas G Viswas.G@microchip.com Signed-off-by: Ruksar Devadi Ruksar.devadi@microchip.com Signed-off-by: Radha Ramachandran radha@google.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/pm8001/pm8001_hwi.c | 21 +++++++++++++++------ drivers/scsi/pm8001/pm80xx_hwi.c | 8 -------- 2 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c index 2b7b2954ec31a..597d7a096a972 100644 --- a/drivers/scsi/pm8001/pm8001_hwi.c +++ b/drivers/scsi/pm8001/pm8001_hwi.c @@ -1356,12 +1356,19 @@ int pm8001_mpi_build_cmd(struct pm8001_hba_info *pm8001_ha, { u32 Header = 0, hpriority = 0, bc = 1, category = 0x02; void *pMessage; - - if (pm8001_mpi_msg_free_get(circularQ, pm8001_ha->iomb_size, - &pMessage) < 0) { + unsigned long flags; + int q_index = circularQ - pm8001_ha->inbnd_q_tbl; + int rv = -1; + + WARN_ON(q_index >= PM8001_MAX_INB_NUM); + spin_lock_irqsave(&circularQ->iq_lock, flags); + rv = pm8001_mpi_msg_free_get(circularQ, pm8001_ha->iomb_size, + &pMessage); + if (rv < 0) { PM8001_IO_DBG(pm8001_ha, - pm8001_printk("No free mpi buffer\n")); - return -ENOMEM; + pm8001_printk("No free mpi buffer\n")); + rv = -ENOMEM; + goto done; }
if (nb > (pm8001_ha->iomb_size - sizeof(struct mpi_msg_hdr))) @@ -1384,7 +1391,9 @@ int pm8001_mpi_build_cmd(struct pm8001_hba_info *pm8001_ha, pm8001_printk("INB Q %x OPCODE:%x , UPDATED PI=%d CI=%d\n", responseQueue, opCode, circularQ->producer_idx, circularQ->consumer_index)); - return 0; +done: + spin_unlock_irqrestore(&circularQ->iq_lock, flags); + return rv; }
u32 pm8001_mpi_msg_free_set(struct pm8001_hba_info *pm8001_ha, void *pMsg, diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c index 7593f248afb2c..5fe50e0effcd5 100644 --- a/drivers/scsi/pm8001/pm80xx_hwi.c +++ b/drivers/scsi/pm8001/pm80xx_hwi.c @@ -4281,7 +4281,6 @@ static int pm80xx_chip_smp_req(struct pm8001_hba_info *pm8001_ha, char *preq_dma_addr = NULL; __le64 tmp_addr; u32 i, length; - unsigned long flags;
memset(&smp_cmd, 0, sizeof(smp_cmd)); /* @@ -4377,10 +4376,8 @@ static int pm80xx_chip_smp_req(struct pm8001_hba_info *pm8001_ha,
build_smp_cmd(pm8001_dev->device_id, smp_cmd.tag, &smp_cmd, pm8001_ha->smp_exp_mode, length); - spin_lock_irqsave(&circularQ->iq_lock, flags); rc = pm8001_mpi_build_cmd(pm8001_ha, circularQ, opc, &smp_cmd, sizeof(smp_cmd), 0); - spin_unlock_irqrestore(&circularQ->iq_lock, flags); if (rc) goto err_out_2; return 0; @@ -4444,7 +4441,6 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha, u64 phys_addr, start_addr, end_addr; u32 end_addr_high, end_addr_low; struct inbound_queue_table *circularQ; - unsigned long flags; u32 q_index, cpu_id; u32 opc = OPC_INB_SSPINIIOSTART; memset(&ssp_cmd, 0, sizeof(ssp_cmd)); @@ -4582,10 +4578,8 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha, ssp_cmd.esgl = 0; } } - spin_lock_irqsave(&circularQ->iq_lock, flags); ret = pm8001_mpi_build_cmd(pm8001_ha, circularQ, opc, &ssp_cmd, sizeof(ssp_cmd), q_index); - spin_unlock_irqrestore(&circularQ->iq_lock, flags); return ret; }
@@ -4819,10 +4813,8 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha, } } } - spin_lock_irqsave(&circularQ->iq_lock, flags); ret = pm8001_mpi_build_cmd(pm8001_ha, circularQ, opc, &sata_cmd, sizeof(sata_cmd), q_index); - spin_unlock_irqrestore(&circularQ->iq_lock, flags); return ret; }