drbd: use sched_setscheduler()

It was unnoticed for some time that assigning to current->policy is
no longer sufficient to set a real time priority for a kernel thread.

Reported-by: Charlie Suffin <Charlie.Suffin@stratus.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 5 insertions, 3 deletions

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index a75c0b134856..0f449bbf0edf 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -5257,9 +5257,11 @@ int drbd_asender(struct drbd_thread *thi)
         bool ping_timeout_active = false;
         struct net_conf *nc;
         int ping_timeo, tcp_cork, ping_int;
+        struct sched_param param = { .sched_priority = 2 };
 
-        current->policy = SCHED_RR;  /* Make this a realtime task! */
-        current->rt_priority = 2;    /* more important than all other tasks */
+        rv = sched_setscheduler(current, SCHED_RR, &param);
+        if (rv < 0)
+                conn_err(tconn, "drbd_asender: ERROR set priority, ret=%d\n", rv);
 
         while (get_t_state(thi) == RUNNING) {
                 drbd_thread_current_set_cpu(thi);
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 316330705fd7..1b4d4ee1168f 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -52,7 +52,7 @@
 #endif
 
 extern const char *drbd_buildtag(void);
-#define REL_VERSION "8.4.2"
+#define REL_VERSION "8.4.3"
 #define API_VERSION 1
 #define PRO_VERSION_MIN 86
 #define PRO_VERSION_MAX 101