linux-kernel - [PATCH 2/2] drm: Change deadlock-avoidance algorithm for the modeset locks.

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Date:   Wed, 13 Jun 2018 09:47:45 +0200
From:   Thomas Hellstrom <thellstrom@...are.com>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Thomas Hellstrom <thellstrom@...are.com>
Subject: [PATCH 2/2] drm: Change deadlock-avoidance algorithm for the modeset locks.

For modeset locks we don't expect a high number of contending
transactions so change algorithm from Wait-Die to Wound-Wait.

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
---
 drivers/gpu/drm/drm_modeset_lock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index f22a7ef41de1..294997765a2c 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -70,7 +70,7 @@
  * lists and lookup data structures.
  */

-static DEFINE_WW_CLASS(crtc_ww_class, true);
+static DEFINE_WW_CLASS(crtc_ww_class, false);

 /**
  * drm_modeset_lock_all - take all modeset locks
-- 
2.14.3