Merge branch 'md-next' of https://git.kernel.org/pub/scm/linux/kernel…

…/git/song/md into for-6.3/block

Pull MD fix from Song:

"This commit fixes a rare crash during the takeover process."

* 'md-next' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md:
  md: account io_acct_set usage with active_io

drivers/md/md.c

@@ -8628,12 +8628,15 @@ static void md_end_io_acct(struct bio *bio)
 {
 	struct md_io_acct *md_io_acct = bio->bi_private;
 	struct bio *orig_bio = md_io_acct->orig_bio;
+	struct mddev *mddev = md_io_acct->mddev;
 
 	orig_bio->bi_status = bio->bi_status;
 
 	bio_end_io_acct(orig_bio, md_io_acct->start_time);
 	bio_put(bio);
 	bio_endio(orig_bio);
+
+	percpu_ref_put(&mddev->active_io);
 }
 
 /*
@@ -8649,10 +8652,13 @@ void md_account_bio(struct mddev *mddev, struct bio **bio)
 	if (!blk_queue_io_stat(bdev->bd_disk->queue))
 		return;
 
+	percpu_ref_get(&mddev->active_io);
+
 	clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set);
 	md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
 	md_io_acct->orig_bio = *bio;
 	md_io_acct->start_time = bio_start_io_acct(*bio);
+	md_io_acct->mddev = mddev;
 
 	clone->bi_end_io = md_end_io_acct;
 	clone->bi_private = md_io_acct;

drivers/md/md.h

@@ -710,9 +710,10 @@ struct md_thread {
 };
 
 struct md_io_acct {
-	struct bio *orig_bio;
-	unsigned long start_time;
-	struct bio bio_clone;
+	struct mddev	*mddev;
+	struct bio	*orig_bio;
+	unsigned long	start_time;
+	struct bio	bio_clone;
 };
 
 #define THREAD_WAKEUP  0