diff mbox series

[5.15,141/207] drm/vc4: kms: Add missing drm_crtc_commit_put

Message ID 20211206145615.114552684@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Dec. 6, 2021, 2:56 p.m. UTC 
From: Maxime Ripard <maxime@cerno.tech>

commit 049cfff8d53a30cae3349ff71a4c01b7d9981bc2 upstream.

Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a
commit") introduced a global state for the HVS, with each FIFO storing
the current CRTC commit so that we can properly synchronize commits.

However, the refcounting was off and we thus ended up leaking the
drm_crtc_commit structure every commit. Add a drm_crtc_commit_put to
prevent the leakage.

Fixes: 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Tested-by: Jian-Hong Pan <jhp@endlessos.org>
Link: https://lore.kernel.org/r/20211117094527.146275-4-maxime@cerno.tech
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/vc4/vc4_kms.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -361,6 +361,7 @@  static void vc4_atomic_commit_tail(struc
 		struct vc4_crtc_state *vc4_crtc_state =
 			to_vc4_crtc_state(old_crtc_state);
 		unsigned int channel = vc4_crtc_state->assigned_channel;
+		struct drm_crtc_commit *commit;
 		int ret;
 
 		if (channel == VC4_HVS_CHANNEL_DISABLED)
@@ -369,9 +370,15 @@  static void vc4_atomic_commit_tail(struc
 		if (!old_hvs_state->fifo_state[channel].in_use)
 			continue;
 
-		ret = drm_crtc_commit_wait(old_hvs_state->fifo_state[channel].pending_commit);
+		commit = old_hvs_state->fifo_state[channel].pending_commit;
+		if (!commit)
+			continue;
+
+		ret = drm_crtc_commit_wait(commit);
 		if (ret)
 			drm_err(dev, "Timed out waiting for commit\n");
+
+		drm_crtc_commit_put(commit);
 	}
 
 	if (vc4->hvs->hvs5)