From 68e989dc044346a7941370c48a96a64f42a36be1 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sat, 13 May 2017 11:52:01 +0100
Subject: [PATCH] drm/dp: Wait up all outstanding tx waiters
Git-commit: 68e989dc044346a7941370c48a96a64f42a36be1
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

As we can have multiple tx in the queue, with individual waiters, make
sure that all are woken when any state changes (so that we are sure the
right owner of the txmsg is woken).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170513105201.17658-2-chris@chris-wilson.co.uk
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/drm_dp_mst_topology.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -862,7 +862,7 @@ static void drm_dp_destroy_mst_branch_de
 	mutex_unlock(&mstb->mgr->qlock);
 
 	if (wake_tx)
-		wake_up(&mstb->mgr->tx_waitq);
+		wake_up_all(&mstb->mgr->tx_waitq);
 
 	kref_put(kref, drm_dp_free_mst_branch_device);
 }
@@ -1517,7 +1517,7 @@ static void process_single_down_tx_qlock
 		if (txmsg->seqno != -1)
 			txmsg->dst->tx_slots[txmsg->seqno] = NULL;
 		txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
-		wake_up(&mgr->tx_waitq);
+		wake_up_all(&mgr->tx_waitq);
 	}
 }
 
@@ -2276,7 +2276,7 @@ static int drm_dp_mst_handle_down_rep(st
 		mstb->tx_slots[slot] = NULL;
 		mutex_unlock(&mgr->qlock);
 
-		wake_up(&mgr->tx_waitq);
+		wake_up_all(&mgr->tx_waitq);
 	}
 	return ret;
 }