md/raid10: factor out code from wait_barrier() to stop_waiting_barrier()

mainline inclusion
from mainline-v6.1-rc1
commit ed2e063f
category: bugfix
bugzilla: 188380, https://gitee.com/openeuler/kernel/issues/I6GISC
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ed2e063f92c44c891ccd883e289dde6ca870edcc

--------------------------------

Currently the nasty condition in wait_barrier() is hard to read. This
patch factors out the condition into a function.

There are no functional changes.
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Acked-by: NPaul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: NLogan Gunthorpe <logang@deltatee.com>
Acked-by: NGuoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: NSong Liu <song@kernel.org>

conflict:
	drivers/md/raid10.c
Signed-off-by: NLi Nan <linan122@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
(cherry picked from commit 7aad54e0)

drivers/md/raid10.c

@@ -953,36 +953,41 @@ static void lower_barrier(struct r10conf *conf)
 	spin_unlock_irqrestore(&conf->resync_lock, flags);
 	wake_up(&conf->wait_barrier);
 }
+static bool stop_waiting_barrier(struct r10conf *conf)
+{
+	struct bio_list *bio_list = current->bio_list;
+
+	/* barrier is dropped */
+	if (!conf->barrier)
+		return true;
+
+	/*
+	 * If there are already pending requests (preventing the barrier from
+	 * rising completely), and the pre-process bio queue isn't empty, then
+	 * don't wait, as we need to empty that queue to get the nr_pending
+	 * count down.
+	 */
+	if (atomic_read(&conf->nr_pending) && bio_list &&
+	    (!bio_list_empty(&bio_list[0]) || !bio_list_empty(&bio_list[1])))
+		return true;
+
+	/* move on if recovery thread is blocked by us */
+	if (conf->mddev->thread->tsk == current &&
+	    test_bit(MD_RECOVERY_RUNNING, &conf->mddev->recovery) &&
+	    conf->nr_queued > 0)
+		return true;
+
+	return false;
+}
 
 static void wait_barrier(struct r10conf *conf)
 {
 	spin_lock_irq(&conf->resync_lock);
 	if (conf->barrier) {
-		struct bio_list *bio_list = current->bio_list;
 		conf->nr_waiting++;
-		/* Wait for the barrier to drop.
-		 * However if there are already pending
-		 * requests (preventing the barrier from
-		 * rising completely), and the
-		 * pre-process bio queue isn't empty,
-		 * then don't wait, as we need to empty
-		 * that queue to get the nr_pending
-		 * count down.
-		 */
 		raid10_log(conf->mddev, "wait barrier");
 		wait_event_lock_irq(conf->wait_barrier,
-				    !conf->barrier ||
-				    (atomic_read(&conf->nr_pending) &&
-				     bio_list &&
-				     (!bio_list_empty(&bio_list[0]) ||
-				      !bio_list_empty(&bio_list[1]))) ||
-				     /* move on if recovery thread is
-				      * blocked by us
-				      */
-				     (conf->mddev->thread->tsk == current &&
-				      test_bit(MD_RECOVERY_RUNNING,
-					       &conf->mddev->recovery) &&
-				      conf->nr_queued > 0),
+				    stop_waiting_barrier(conf),
 				    conf->resync_lock);
 		conf->nr_waiting--;
 		if (!conf->nr_waiting)