drbd: Make sure tl_restart(, resend) can not get called multiple times for a new...

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 8d14635..c6658f5 100644 (file)
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1209,6 +1209,7 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
                           union drbd_state ns, enum chg_state_flags flags)
 {
        enum drbd_fencing_p fp;
+       enum drbd_req_event what = nothing;
 
        if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
                clear_bit(CRASHED_PRIMARY, &mdev->flags);
@@ -1234,21 +1235,14 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
 
        if (os.susp && ns.susp && mdev->sync_conf.on_no_data == OND_SUSPEND_IO) {
                if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
-                       if (ns.conn == C_CONNECTED) {
-                               spin_lock_irq(&mdev->req_lock);
-                               _tl_restart(mdev, resend);
-                               _drbd_set_state(_NS(mdev, susp, 0), CS_VERBOSE, NULL);
-                               spin_unlock_irq(&mdev->req_lock);
-                       } else /* ns.conn > C_CONNECTED */
+                       if (ns.conn == C_CONNECTED)
+                               what = resend;
+                       else /* ns.conn > C_CONNECTED */
                                dev_err(DEV, "Unexpected Resynd going on!\n");
                }
 
-               if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING) {
-                       spin_lock_irq(&mdev->req_lock);
-                       _tl_restart(mdev, restart_frozen_disk_io);
-                       _drbd_set_state(_NS(mdev, susp, 0), CS_VERBOSE, NULL);
-                       spin_unlock_irq(&mdev->req_lock);
-               }
+               if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
+                       what = restart_frozen_disk_io;
        }
 
        if (fp == FP_STONITH && ns.susp) {
@@ -1267,12 +1261,17 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
                /* case2: The connection was established again: */
                if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
                        clear_bit(NEW_CUR_UUID, &mdev->flags);
-                       spin_lock_irq(&mdev->req_lock);
-                       _tl_restart(mdev, resend);
-                       _drbd_set_state(_NS(mdev, susp, 0), CS_VERBOSE, NULL);
-                       spin_unlock_irq(&mdev->req_lock);
+                       what = resend;
                }
        }
+
+       if (what != nothing) {
+               spin_lock_irq(&mdev->req_lock);
+               _tl_restart(mdev, what);
+               _drbd_set_state(_NS(mdev, susp, 0), CS_VERBOSE, NULL);
+               spin_unlock_irq(&mdev->req_lock);
+       }
+
        /* Do not change the order of the if above and the two below... */
        if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) {      /* attach on the peer */
                drbd_send_uuids(mdev);