drm/imx: ignore plane updates on disabled crtcs

This patch fixes backtraces like the following when sending SIGKILL to a
process with a currently pending plane update:

    [drm:ipu_plane_atomic_check] CRTC should be enabled
    [drm:drm_framebuffer_remove] *ERROR* failed to commit
    ------------[ cut here ]------------
    WARNING: CPU: 3 PID: 63 at drivers/gpu/drm/drm_framebuffer.c:926 drm_framebuffer_remove+0x47c/0x498
    atomic remove_fb failed with -22

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
index c390924de93d978d3acb4200c846fe6b53f753c8..21e964f6ab5cf58559e059d7d34c4bb26359c042 100644 (file)
--- a/drivers/gpu/drm/imx/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3-plane.c
@@ -370,9 +370,9 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
        if (ret)
                return ret;
 
-       /* CRTC should be enabled */
+       /* nothing to check when disabling or disabled */
        if (!crtc_state->enable)
-               return -EINVAL;
+               return 0;
 
        switch (plane->type) {
        case DRM_PLANE_TYPE_PRIMARY: