6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Quinn Tran <qutran@xxxxxxxxxxx>
commit 6d0b65569c0a10b27c49bacd8d25bcd406003533 upstream.
Fix race condition between Interrupt thread and Chip reset thread in trying
to flush the same mailbox. With the race condition, the "ha->mbx_intr_comp"
will get an extra complete() call. The extra complete call create erroneous
mailbox timeout condition when the next mailbox is sent where the mailbox
call does not wait for interrupt to arrive. Instead, it advances without
waiting.
Add lock protection around the check for mailbox completion.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: b2000805a975 ("scsi: qla2xxx: Flush mailbox commands on chip reset")
Signed-off-by: Quinn Tran <quinn.tran@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230821130045.34850-3-njavali@xxxxxxxxxxx
Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/qla2xxx/qla_def.h | 1 -
drivers/scsi/qla2xxx/qla_init.c | 7 ++++---
drivers/scsi/qla2xxx/qla_mbx.c | 4 ----
drivers/scsi/qla2xxx/qla_os.c | 1 -
4 files changed, 4 insertions(+), 9 deletions(-)
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -4384,7 +4384,6 @@ struct qla_hw_data {
uint8_t aen_mbx_count;
atomic_t num_pend_mbx_stage1;
atomic_t num_pend_mbx_stage2;
- atomic_t num_pend_mbx_stage3;
uint16_t frame_payload_size;
uint32_t login_retry_count;
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -7390,14 +7390,15 @@ qla2x00_abort_isp_cleanup(scsi_qla_host_
}
/* purge MBox commands */
- if (atomic_read(&ha->num_pend_mbx_stage3)) {
+ spin_lock_irqsave(&ha->hardware_lock, flags);
+ if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags)) {
clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
complete(&ha->mbx_intr_comp);
}
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
i = 0;
- while (atomic_read(&ha->num_pend_mbx_stage3) ||
- atomic_read(&ha->num_pend_mbx_stage2) ||
+ while (atomic_read(&ha->num_pend_mbx_stage2) ||
atomic_read(&ha->num_pend_mbx_stage1)) {
msleep(20);
i++;
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -273,7 +273,6 @@ qla2x00_mailbox_command(scsi_qla_host_t
spin_unlock_irqrestore(&ha->hardware_lock, flags);
wait_time = jiffies;
- atomic_inc(&ha->num_pend_mbx_stage3);
if (!wait_for_completion_timeout(&ha->mbx_intr_comp,
mcp->tov * HZ)) {
ql_dbg(ql_dbg_mbx, vha, 0x117a,
@@ -290,7 +289,6 @@ qla2x00_mailbox_command(scsi_qla_host_t
spin_unlock_irqrestore(&ha->hardware_lock,
flags);
atomic_dec(&ha->num_pend_mbx_stage2);
- atomic_dec(&ha->num_pend_mbx_stage3);
rval = QLA_ABORTED;
goto premature_exit;
}
@@ -302,11 +300,9 @@ qla2x00_mailbox_command(scsi_qla_host_t
ha->flags.mbox_busy = 0;
spin_unlock_irqrestore(&ha->hardware_lock, flags);
atomic_dec(&ha->num_pend_mbx_stage2);
- atomic_dec(&ha->num_pend_mbx_stage3);
rval = QLA_ABORTED;
goto premature_exit;
}
- atomic_dec(&ha->num_pend_mbx_stage3);
if (time_after(jiffies, wait_time + 5 * HZ))
ql_log(ql_log_warn, vha, 0x1015, "cmd=0x%x, waited %d msecs\n",
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3007,7 +3007,6 @@ qla2x00_probe_one(struct pci_dev *pdev,
ha->max_exchg = FW_MAX_EXCHANGES_CNT;
atomic_set(&ha->num_pend_mbx_stage1, 0);
atomic_set(&ha->num_pend_mbx_stage2, 0);
- atomic_set(&ha->num_pend_mbx_stage3, 0);
atomic_set(&ha->zio_threshold, DEFAULT_ZIO_THRESHOLD);
ha->last_zio_threshold = DEFAULT_ZIO_THRESHOLD;
INIT_LIST_HEAD(&ha->tmf_pending);
