On Mon, Jul 24, 2017 at 09:17:40AM +0300, oferh@xxxxxxxxxxx wrote:
> From: Ofer Heifetz <oferh@xxxxxxxxxxx>
>
> Since thread_group worker and raid5d kthread are not in sync, if
> worker writes stripe before raid5d then requests will be waiting
> for issue_pendig.
>
> Issue observed when building raid5 with ext4, in some build runs
> jbd2 would get hung and requests were waiting in the HW engine
> waiting to be issued.
>
> Fix this by adding a call to async_tx_issue_pending_all in the
> raid5_do_work.
applied, thanks!
> Signed-off-by: Ofer Heifetz <oferh@xxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/md/raid5.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index aeeb8d6..3c0b924 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -6237,6 +6237,8 @@ static void raid5_do_work(struct work_struct *work)
> pr_debug("%d stripes handled\n", handled);
>
> spin_unlock_irq(&conf->device_lock);
> +
> + async_tx_issue_pending_all();
> blk_finish_plug(&plug);
>
> pr_debug("--- raid5worker inactive\n");
> --
> 1.9.1
>