4.9-stable review patch. If anyone has any objections, please let me know.
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From: Guoqing Jiang gqjiang@suse.com
[ Upstream commit cf25ae78fc50010f66b9be945017796da34c434d ]
Since nr_queued is changed, we need to call wake_up here if the array is already frozen and waiting for condition "nr_pending == nr_queued + extra" to be true.
And commit 824e47daddbf ("RAID1: avoid unnecessary spin locks in I/O barrier code") which has already added the wake_up for raid1.
Signed-off-by: Guoqing Jiang gqjiang@suse.com Reviewed-by: NeilBrown neilb@suse.com Signed-off-by: Shaohua Li shli@fb.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/raid10.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -2704,6 +2704,11 @@ static void handle_write_completed(struc list_add(&r10_bio->retry_list, &conf->bio_end_io_list); conf->nr_queued++; spin_unlock_irq(&conf->device_lock); + /* + * In case freeze_array() is waiting for condition + * nr_pending == nr_queued + extra to be true. + */ + wake_up(&conf->wait_barrier); md_wakeup_thread(conf->mddev->thread); } else { if (test_bit(R10BIO_WriteError,