From: Yu Kuai <yukuai3@xxxxxxxxxx>
md_wakeup_thread() can't wakeup md_thread->tsk if md_thread->run is
still in progress, and in some cases md_thread->tsk need to be woke up
directly, like md_set_readonly(), do_md_stop(), and perhaps later in
action_store().
This patch factor out a helper to wake up md_thread directly, prepare to
protect md_thread with rcu.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
drivers/md/md.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1459c2cfb0dd..139c7b0202e3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -92,6 +92,7 @@ static struct workqueue_struct *md_rdev_misc_wq;
static int remove_and_add_spares(struct mddev *mddev,
struct md_rdev *this);
static void mddev_detach(struct mddev *mddev);
+static void md_wakeup_thread_directly(struct md_thread *thread);
enum md_ro_state {
MD_RDWR,
@@ -6269,10 +6270,12 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
}
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
- if (mddev->sync_thread)
- /* Thread might be blocked waiting for metadata update
- * which will now never happen */
- wake_up_process(mddev->sync_thread->tsk);
+
+ /*
+ * Thread might be blocked waiting for metadata update which will now
+ * never happen
+ */
+ md_wakeup_thread_directly(mddev->sync_thread);
if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
return -EBUSY;
@@ -6333,10 +6336,12 @@ static int do_md_stop(struct mddev *mddev, int mode,
}
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
- if (mddev->sync_thread)
- /* Thread might be blocked waiting for metadata update
- * which will now never happen */
- wake_up_process(mddev->sync_thread->tsk);
+
+ /*
+ * Thread might be blocked waiting for metadata update which will now
+ * never happen
+ */
+ md_wakeup_thread_directly(mddev->sync_thread);
mddev_unlock(mddev);
wait_event(resync_wait, (mddev->sync_thread == NULL &&
@@ -7886,6 +7891,12 @@ static int md_thread(void *arg)
return 0;
}
+static void md_wakeup_thread_directly(struct md_thread *thread)
+{
+ if (thread)
+ wake_up_process(thread->tsk);
+}
+
void md_wakeup_thread(struct md_thread *thread)
{
if (thread) {
--
2.39.2
