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md/raid5: add thread_group worker async_tx_issue_pending_all 

commit 7e96d55963 upstream.

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.

Signed-off-by: Ofer Heifetz <oferh@marvell.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Ofer Heifetz 2017-07-24 09:17:40 +03:00 committed by Greg Kroah-Hartman
parent d745f0f67b
commit fabc7dffe9
1 changed files with 2 additions and 0 deletions
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2
drivers/md/raid5.c
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@ -5843,6 +5843,8 @@ 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");