linux-kernel - [PATCH] drm/atomic: Check that the config funcs exist drm_mode

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Message-Id: <1557256451-24950-1-git-send-email-jcrouse@codeaurora.org>
Date:   Tue,  7 May 2019 13:14:11 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     freedreno@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, Sean Paul <sean@...rly.run>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: [PATCH] drm/atomic: Check that the config funcs exist drm_mode_alloc

An error while initializing the msm driver ends up calling
drm_atomic_helper_shutdown() without first initializing the funcs
in mode_config. While I'm not 100% sure this isn't a ordering
problem in msm adding a check to drm_mode_alloc seems like
a nice and safe solution.

Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
---

 drivers/gpu/drm/drm_atomic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 5eb4013..1729428 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -114,6 +114,9 @@ drm_atomic_state_alloc(struct drm_device *dev)
 {
 	struct drm_mode_config *config = &dev->mode_config;
 
+	if (!config->funcs)
+		return NULL;
+
 	if (!config->funcs->atomic_state_alloc) {
 		struct drm_atomic_state *state;
 
-- 
2.7.4