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scsi: scsi_debug: Strengthen defer_t accesses 

Use READ_ONCE() and WRITE_ONCE() macros when accessing the
sdebug_defer::defer_t value.

Link: https://lore.kernel.org/r/20220109012853.301953-3-dgilbert@interlog.com
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Douglas Gilbert 2022-01-08 20:28:46 -05:00 коммит произвёл Martin K. Petersen
Родитель 2aad3cd853
Коммит d9d23a5a34
1 изменённых файлов: 11 добавлений и 11 удалений
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22
drivers/scsi/scsi_debug.c
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@ -4782,7 +4782,7 @@ static void sdebug_q_cmd_complete(struct sdebug_defer *sd_dp)
return;
}
spin_lock_irqsave(&sqp->qc_lock, iflags);
sd_dp->defer_t = SDEB_DEFER_NONE;
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_NONE);
sqcp = &sqp->qc_arr[qc_idx];
scp = sqcp->a_cmnd;
if (unlikely(scp == NULL)) {
@ -5103,8 +5103,8 @@ static bool stop_queued_cmnd(struct scsi_cmnd *cmnd)
sqcp->a_cmnd = NULL;
sd_dp = sqcp->sd_dp;
if (sd_dp) {
l_defer_t = sd_dp->defer_t;
sd_dp->defer_t = SDEB_DEFER_NONE;
l_defer_t = READ_ONCE(sd_dp->defer_t);
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_NONE);
} else
l_defer_t = SDEB_DEFER_NONE;
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
@ -5145,8 +5145,8 @@ static void stop_all_queued(bool done_with_no_conn)
sqcp->a_cmnd = NULL;
sd_dp = sqcp->sd_dp;
if (sd_dp) {
l_defer_t = sd_dp->defer_t;
sd_dp->defer_t = SDEB_DEFER_NONE;
l_defer_t = READ_ONCE(sd_dp->defer_t);
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_NONE);
} else
l_defer_t = SDEB_DEFER_NONE;
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
@ -5627,7 +5627,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
sd_dp->sqa_idx = sqp - sdebug_q_arr;
sd_dp->qc_idx = k;
}
sd_dp->defer_t = SDEB_DEFER_POLL;
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_POLL);
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
} else {
if (!sd_dp->init_hrt) {
@ -5639,7 +5639,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
sd_dp->sqa_idx = sqp - sdebug_q_arr;
sd_dp->qc_idx = k;
}
sd_dp->defer_t = SDEB_DEFER_HRT;
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_HRT);
/* schedule the invocation of scsi_done() for a later time */
hrtimer_start(&sd_dp->hrt, kt, HRTIMER_MODE_REL_PINNED);
}
@ -5658,7 +5658,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
sd_dp->sqa_idx = sqp - sdebug_q_arr;
sd_dp->qc_idx = k;
}
sd_dp->defer_t = SDEB_DEFER_POLL;
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_POLL);
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
} else {
if (!sd_dp->init_wq) {
@ -5668,7 +5668,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
sd_dp->qc_idx = k;
INIT_WORK(&sd_dp->ew.work, sdebug_q_cmd_wq_complete);
}
sd_dp->defer_t = SDEB_DEFER_WQ;
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_WQ);
schedule_work(&sd_dp->ew.work);
}
if (sdebug_statistics)
@ -7436,7 +7436,7 @@ static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num)
queue_num, qc_idx, __func__);
break;
}
if (sd_dp->defer_t == SDEB_DEFER_POLL) {
if (READ_ONCE(sd_dp->defer_t) == SDEB_DEFER_POLL) {
if (kt_from_boot < sd_dp->cmpl_ts)
continue;
@ -7470,7 +7470,7 @@ static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num)
else
atomic_set(&retired_max_queue, k + 1);
}
sd_dp->defer_t = SDEB_DEFER_NONE;
WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_NONE);
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
scsi_done(scp); /* callback to mid level */
spin_lock_irqsave(&sqp->qc_lock, iflags);