[PATCH 5.18 0964/1095] scsi: qla2xxx: Fix crash due to stale SRB access around I/O timeouts

Greg Kroah-Hartman
2022-08-15T23:08:37Z

From: Arun Easi <aeasi@marvell.com>

commit c39587bc0abaf16593f7abcdf8aeec3c038c7d52 upstream.

Ensure SRB is returned during I/O timeout error escalation. If that is not
possible fail the escalation path.

Following crash stack was seen:

BUG: unable to handle kernel paging request at 0000002f56aa90f8
IP: qla_chk_edif_rx_sa_delete_pending+0x14/0x30 [qla2xxx]
Call Trace:
? qla2x00_status_entry+0x19f/0x1c50 [qla2xxx]
? qla2x00_start_sp+0x116/0x1170 [qla2xxx]
? dma_pool_alloc+0x1d6/0x210
? mempool_alloc+0x54/0x130
? qla24xx_process_response_queue+0x548/0x12b0 [qla2xxx]
? qla_do_work+0x2d/0x40 [qla2xxx]
? process_one_work+0x14c/0x390

Link: https://lore.kernel.org/r/20220616053508.27186-6-njavali@marvell.com
Fixes: d74595278f4a ("scsi: qla2xxx: Add multiple queue pair functionality.")
Cc: stable@vger.kernel.org
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/qla2xxx/qla_os.c | 43 ++++++++++++++++++++++++++++++------------
1 file changed, 31 insertions(+), 12 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -1337,21 +1337,20 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd)
/*
* Returns: QLA_SUCCESS or QLA_FUNCTION_FAILED.
*/
-int
-qla2x00_eh_wait_for_pending_commands(scsi_qla_host_t *vha, unsigned int t,
- uint64_t l, enum nexus_wait_type type)
+static int
+__qla2x00_eh_wait_for_pending_commands(struct qla_qpair *qpair, unsigned int t,
+ uint64_t l, enum nexus_wait_type type)
{
int cnt, match, status;
unsigned long flags;
- struct qla_hw_data *ha = vha->hw;
- struct req_que *req;
+ scsi_qla_host_t *vha = qpair->vha;
+ struct req_que *req = qpair->req;
srb_t *sp;
struct scsi_cmnd *cmd;

status = QLA_SUCCESS;

- spin_lock_irqsave(&ha->hardware_lock, flags);
- req = vha->req;
+ spin_lock_irqsave(qpair->qp_lock_ptr, flags);
for (cnt = 1; status == QLA_SUCCESS &&
cnt < req->num_outstanding_cmds; cnt++) {
sp = req->outstanding_cmds[cnt];
@@ -1378,12 +1377,32 @@ qla2x00_eh_wait_for_pending_commands(scs
if (!match)
continue;

- spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
status = qla2x00_eh_wait_on_command(cmd);
- spin_lock_irqsave(&ha->hardware_lock, flags);
+ spin_lock_irqsave(qpair->qp_lock_ptr, flags);
}
- spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
+
+ return status;
+}
+
+int
+qla2x00_eh_wait_for_pending_commands(scsi_qla_host_t *vha, unsigned int t,
+ uint64_t l, enum nexus_wait_type type)
+{
+ struct qla_qpair *qpair;
+ struct qla_hw_data *ha = vha->hw;
+ int i, status = QLA_SUCCESS;

+ status = __qla2x00_eh_wait_for_pending_commands(ha->base_qpair, t, l,
+ type);
+ for (i = 0; status == QLA_SUCCESS && i < ha->max_qpairs; i++) {
+ qpair = ha->queue_pair_map[i];
+ if (!qpair)
+ continue;
+ status = __qla2x00_eh_wait_for_pending_commands(qpair, t, l,
+ type);
+ }
return status;
}

@@ -1420,7 +1439,7 @@ qla2xxx_eh_device_reset(struct scsi_cmnd
return err;

if (fcport->deleted)
- return SUCCESS;
+ return FAILED;

ql_log(ql_log_info, vha, 0x8009,
"DEVICE RESET ISSUED nexus=%ld:%d:%llu cmd=%p.\n", vha->host_no,
@@ -1488,7 +1507,7 @@ qla2xxx_eh_target_reset(struct scsi_cmnd
return err;

if (fcport->deleted)
- return SUCCESS;
+ return FAILED;

ql_log(ql_log_info, vha, 0x8009,
"TARGET RESET ISSUED nexus=%ld:%d cmd=%p.\n", vha->host_no,