drm/vmwgfx: Handle possible ENOMEM in vmw_stdu_connector_atomic_check

[ Upstream commit 4809a017a2bc42ff239d53ade4b2e70f2fe81348 ]

Handle unlikely ENOMEN condition and other errors in
vmw_stdu_connector_atomic_check.

Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: 75c3e8a26a35 ("drm/vmwgfx: Trigger a modeset when the screen moves")
Reviewed-by: Zack Rusin <zack.rusin@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240809183756.27283-1-ian.forbes@broadcom.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
index fab155a68054a71b9840c7b8a6356be815be6505..82d18b88f4a7e7aaff2d7123fce1af05754e34d9 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
@@ -886,6 +886,10 @@ static int vmw_stdu_connector_atomic_check(struct drm_connector *conn,
        struct drm_crtc_state *new_crtc_state;
 
        conn_state = drm_atomic_get_connector_state(state, conn);
+
+       if (IS_ERR(conn_state))
+               return PTR_ERR(conn_state);
+
        du = vmw_connector_to_stdu(conn);
 
        if (!conn_state->crtc)