On Mon, Jul 25 2016 at 9:16pm -0400,
Mike Snitzer <snitzer@xxxxxxxxxx> wrote:
> Hi Bart,
>
> Please try this patch to see if it fixes your issue, thanks.
>
> diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
> index 52baf8a..287caa7 100644
> --- a/drivers/md/dm-mpath.c
> +++ b/drivers/md/dm-mpath.c
> @@ -433,10 +433,17 @@ failed:
> */
> static int must_push_back(struct multipath *m)
> {
> - return (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) ||
> - ((test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) !=
> - test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags)) &&
> - dm_noflush_suspending(m->ti)));
> + bool r;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&m->lock, flags);
> + r = (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) ||
> + ((test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) !=
> + test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags)) &&
> + dm_noflush_suspending(m->ti)));
> + spin_unlock_irqrestore(&m->lock, flags);
> +
> + return r;
> }
>
> /*
In addition to the above patch, please apply this patch and retest your
4.7 kernel:
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 287caa7..16583c1 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1416,12 +1416,14 @@ static void multipath_postsuspend(struct dm_target *ti)
static void multipath_resume(struct dm_target *ti)
{
struct multipath *m = ti->private;
+ unsigned long flags;
+ spin_lock_irqsave(&m->lock, flags);
if (test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags))
set_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);
else
clear_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);
- smp_mb__after_atomic();
+ spin_unlock_irqrestore(&m->lock, flags);
}
/*
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