md: delay notification of 'active_idle' to the recovery thread

sysfs_notify might sleep, so do not call it from md_safemode_timeout.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index c2ff77ccec50..0f1b83096425 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3483,7 +3483,7 @@ static void md_safemode_timeout(unsigned long data)
         if (!atomic_read(&mddev->writes_pending)) {
                 mddev->safemode = 1;
                 if (mddev->external)
-                        sysfs_notify(&mddev->kobj, NULL, "array_state");
+                        set_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags);
         }
         md_wakeup_thread(mddev->thread);
 }
@@ -6051,6 +6051,9 @@ void md_check_recovery(mddev_t *mddev)
         if (mddev->bitmap)
                 bitmap_daemon_work(mddev->bitmap);
 
+        if (test_and_clear_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags))
+                sysfs_notify(&mddev->kobj, NULL, "array_state");
+
         if (mddev->ro)
                 return;
 
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 9f2549ac0e2d..c200b9a34aff 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -128,6 +128,7 @@ struct mddev_s
 #define MD_CHANGE_DEVS  0       /* Some device status has changed */
 #define MD_CHANGE_CLEAN 1       /* transition to or from 'clean' */
 #define MD_CHANGE_PENDING 2     /* superblock update in progress */
+#define MD_NOTIFY_ARRAY_STATE 3 /* atomic context wants to notify userspace */
 
         int                             ro;