1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 82821ee0d57f..01175dac0db6 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5291,6 +5291,11 @@ int md_run(struct mddev *mddev)
         if (start_readonly && mddev->ro == 0)
                 mddev->ro = 2; /* read-only, but switch on first write */
 
+        /*
+         * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
+         * up mddev->thread. It is important to initialize critical
+         * resources for mddev->thread BEFORE calling pers->run().
+         */
         err = pers->run(mddev);
         if (err)
                 pr_warn("md: pers->run() failed ...\n");