From 53f9601e908d42481addd67cdb01a9288c611124 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Wed, 17 Nov 2021 10:45:24 +0100 Subject: [PATCH] drm/vc4: kms: Add missing drm_crtc_commit_put 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 Reviewed-by: Dave Stevenson Tested-by: Jian-Hong Pan Link: https://lore.kernel.org/r/20211117094527.146275-4-maxime@cerno.tech Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/vc4/vc4_kms.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index 3f780c1..7c1d0c3 100644 --- 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(struct drm_atomic_state *state) 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(struct drm_atomic_state *state) 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) -- 2.7.4