linux-kernel - [PATCH] drm/atomic-helper: Call stall_checks() before allocate drm_crtc

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Date:   Thu, 26 Oct 2023 11:02:13 +0800
From:   oushixiong <oushixiong@...inos.cn>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Shixiong Ou <oushixiong@...inos.cn>
Subject: [PATCH] drm/atomic-helper: Call stall_checks() before allocate drm_crtc_commit

From: Shixiong Ou <oushixiong@...inos.cn>

It is wrong to call stall_checks() after allocating memory
for struct drm_crtc_commit as it will cause memory leaks if
too many nonblock commit works return -EBUSY.
So it needs to call stall_checks() before allocate drm_crtc_commit.

Signed-off-by: Shixiong Ou <oushixiong@...inos.cn>
---
 drivers/gpu/drm/drm_atomic_helper.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 2444fc33dd7c..94ea878b240d 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2283,6 +2283,10 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
 	funcs = state->dev->mode_config.helper_private;
 
 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
+		ret = stall_checks(crtc, nonblock);
+		if (ret)
+			return ret;
+
 		commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 		if (!commit)
 			return -ENOMEM;
@@ -2291,10 +2295,6 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
 
 		new_crtc_state->commit = commit;
 
-		ret = stall_checks(crtc, nonblock);
-		if (ret)
-			return ret;
-
 		/*
 		 * Drivers only send out events when at least either current or
 		 * new CRTC state is active. Complete right away if everything
-- 
2.25.1