linux-kernel - [PATCH AUTOSEL 4.20 096/304] drm: Clear state->acquire_ctx before leaving drm_atomic_helper_commit_duplicated

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Date:   Mon, 28 Jan 2019 10:40:13 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sean Paul <seanpaul@...omium.org>, Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.20 096/304] drm: Clear state->acquire_ctx before leaving drm_atomic_helper_commit_duplicated_state()

From: Sean Paul <seanpaul@...omium.org>

[ Upstream commit aa394b0dd68cb00c483e151dcd84713d4d517ed1 ]

drm_atomic_helper_commit_duplicated_state() sets state->acquire_ctx to
the context given in the argument and leaves it in state after it
quits. The lifetime of state and context are not guaranteed to be the
same, so we shouldn't leave that pointer hanging around. This patch
resets the context to NULL to avoid any oopses.

Changes in v2:
- Added to the set

Suggested-by: Daniel Vetter <daniel@...ll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20181129150423.239081-1-sean@poorly.run
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/drm_atomic_helper.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index b4e292a56046..df86c2ebfc12 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3212,7 +3212,7 @@ EXPORT_SYMBOL(drm_atomic_helper_suspend);
 int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
 					      struct drm_modeset_acquire_ctx *ctx)
 {
-	int i;
+	int i, ret;
 	struct drm_plane *plane;
 	struct drm_plane_state *new_plane_state;
 	struct drm_connector *connector;
@@ -3231,7 +3231,11 @@ int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
 	for_each_new_connector_in_state(state, connector, new_conn_state, i)
 		state->connectors[i].old_state = connector->state;
 
-	return drm_atomic_commit(state);
+	ret = drm_atomic_commit(state);
+
+	state->acquire_ctx = NULL;
+
+	return ret;
 }
 EXPORT_SYMBOL(drm_atomic_helper_commit_duplicated_state);
 
-- 
2.19.1