[PATCH 5.14 556/849] scsi: pm80xx: Fix lockup in outbound queue management

Greg Kroah-Hartman
2021-11-16T01:26:26Z

From: Ajish Koshy <Ajish.Koshy@microchip.com>

[ Upstream commit b27a40534ef76a22628a5c12f98ea489823a8ba5 ]

Commit 1f02beff224e ("scsi: pm80xx: Remove global lock from outbound queue
processing") introduced a lock per outbound queue. Prior to that change the
driver was using a global lock for all outbound queues.

While processing the I/O responses and events the driver takes the outbound
queue spinlock and is supposed to release it in pm8001_ccb_task_free_done()
before calling command done(). Since the older code was using a global
lock, pm8001_ccb_task_free_done() was releasing the global spin lock. The
change that split the lock per outbound queue did not consider this and
pm8001_ccb_task_free_done() was still releasing the global lock.

Link: https://lore.kernel.org/r/20210906170404.5682-3-Ajish.Koshy@microchip.com
Fixes: 1f02beff224e ("scsi: pm80xx: Remove global lock from outbound queue processing")
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Ajish Koshy <Ajish.Koshy@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/pm8001/pm8001_sas.h | 3 +-
drivers/scsi/pm8001/pm80xx_hwi.c | 53 ++++++++++++++++++++++++++------
2 files changed, 45 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index 62d08b535a4b6..e18f2b60371db 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -457,6 +457,7 @@ struct outbound_queue_table {
__le32 producer_index;
u32 consumer_idx;
spinlock_t oq_lock;
+ unsigned long lock_flags;
};
struct pm8001_hba_memspace {
void __iomem *memvirtaddr;
@@ -738,9 +739,7 @@ pm8001_ccb_task_free_done(struct pm8001_hba_info *pm8001_ha,
{
pm8001_ccb_task_free(pm8001_ha, task, ccb, ccb_idx);
smp_mb(); /*in order to force CPU ordering*/
- spin_unlock(&pm8001_ha->lock);
task->task_done(task);
- spin_lock(&pm8001_ha->lock);
}

#endif
diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index 6ffe17b849ae8..ed02e1aaf868c 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -2379,7 +2379,8 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha, void *piomb)

/*See the comments for mpi_ssp_completion */
static void
-mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
+mpi_sata_completion(struct pm8001_hba_info *pm8001_ha,
+ struct outbound_queue_table *circularQ, void *piomb)
{
struct sas_task *t;
struct pm8001_ccb_info *ccb;
@@ -2616,7 +2617,11 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS);
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_QUEUE_FULL;
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
return;
}
break;
@@ -2632,7 +2637,11 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS);
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_QUEUE_FULL;
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
return;
}
break;
@@ -2656,7 +2665,11 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
IO_OPEN_CNX_ERROR_STP_RESOURCES_BUSY);
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_QUEUE_FULL;
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
return;
}
break;
@@ -2727,7 +2740,11 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
IO_DS_NON_OPERATIONAL);
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_QUEUE_FULL;
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
return;
}
break;
@@ -2747,7 +2764,11 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
IO_DS_IN_ERROR);
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_QUEUE_FULL;
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
return;
}
break;
@@ -2785,12 +2806,17 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
} else {
spin_unlock_irqrestore(&t->task_state_lock, flags);
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
}
}

/*See the comments for mpi_ssp_completion */
-static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
+static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha,
+ struct outbound_queue_table *circularQ, void *piomb)
{
struct sas_task *t;
struct task_status_struct *ts;
@@ -2890,7 +2916,11 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS);
ts->resp = SAS_TASK_COMPLETE;
ts->stat = SAS_QUEUE_FULL;
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
return;
}
break;
@@ -3002,7 +3032,11 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
} else {
spin_unlock_irqrestore(&t->task_state_lock, flags);
+ spin_unlock_irqrestore(&circularQ->oq_lock,
+ circularQ->lock_flags);
pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag);
+ spin_lock_irqsave(&circularQ->oq_lock,
+ circularQ->lock_flags);
}
}

@@ -3902,7 +3936,8 @@ static int ssp_coalesced_comp_resp(struct pm8001_hba_info *pm8001_ha,
* @pm8001_ha: our hba card information
* @piomb: IO message buffer
*/
-static void process_one_iomb(struct pm8001_hba_info *pm8001_ha, void *piomb)
+static void process_one_iomb(struct pm8001_hba_info *pm8001_ha,
+ struct outbound_queue_table *circularQ, void *piomb)
{
__le32 pHeader = *(__le32 *)piomb;
u32 opc = (u32)((le32_to_cpu(pHeader)) & 0xFFF);
@@ -3944,11 +3979,11 @@ static void process_one_iomb(struct pm8001_hba_info *pm8001_ha, void *piomb)
break;
case OPC_OUB_SATA_COMP:
pm8001_dbg(pm8001_ha, MSG, "OPC_OUB_SATA_COMP\n");
- mpi_sata_completion(pm8001_ha, piomb);
+ mpi_sata_completion(pm8001_ha, circularQ, piomb);
break;
case OPC_OUB_SATA_EVENT:
pm8001_dbg(pm8001_ha, MSG, "OPC_OUB_SATA_EVENT\n");
- mpi_sata_event(pm8001_ha, piomb);
+ mpi_sata_event(pm8001_ha, circularQ, piomb);
break;
case OPC_OUB_SSP_EVENT:
pm8001_dbg(pm8001_ha, MSG, "OPC_OUB_SSP_EVENT\n");
@@ -4117,7 +4152,6 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
void *pMsg1 = NULL;
u8 bc;
u32 ret = MPI_IO_STATUS_FAIL;
- unsigned long flags;
u32 regval;

if (vec == (pm8001_ha->max_q_num - 1)) {
@@ -4134,7 +4168,7 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
}
}
circularQ = &pm8001_ha->outbnd_q_tbl[vec];
- spin_lock_irqsave(&circularQ->oq_lock, flags);
+ spin_lock_irqsave(&circularQ->oq_lock, circularQ->lock_flags);
do {
/* spurious interrupt during setup if kexec-ing and
* driver doing a doorbell access w/ the pre-kexec oq
@@ -4145,7 +4179,8 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
ret = pm8001_mpi_msg_consume(pm8001_ha, circularQ, &pMsg1, &bc);
if (MPI_IO_STATUS_SUCCESS == ret) {
/* process the outbound message */
- process_one_iomb(pm8001_ha, (void *)(pMsg1 - 4));
+ process_one_iomb(pm8001_ha, circularQ,
+ (void *)(pMsg1 - 4));
/* free the message from the outbound circular buffer */
pm8001_mpi_msg_free_set(pm8001_ha, pMsg1,
circularQ, bc);
@@ -4160,7 +4195,7 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
break;
}
} while (1);
- spin_unlock_irqrestore(&circularQ->oq_lock, flags);
+ spin_unlock_irqrestore(&circularQ->oq_lock, circularQ->lock_flags);
return ret;
}

--
2.33.0