[PATCH 22/29] drm/tidss: crtc: Cleanup reset implementation

[Maxime Ripard <mripard@kernel.org>]

The tidss_crtc_reset() function will (rightfully) destroy any
pre-existing state.

However, the tidss CRTC driver has its own CRTC state structure that
subclasses drm_crtc_state, and yet will destroy the previous state
by calling __drm_atomic_helper_crtc_destroy_state() and kfree() on its
drm_crtc_state pointer.

It works only because the drm_crtc_state is the first field in the
structure, and thus its offset is 0. It's incredibly fragile however, so
let's call our destroy implementation in such a case to deal with it
properly.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tidss/tidss_crtc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c
index eb431a238b11d22349d61f0e17f05994f50d5f2f..8fcc6a2f94770ae825eeb2a3b09856a2bf2d6a1e 100644
--- a/drivers/gpu/drm/tidss/tidss_crtc.c
+++ b/drivers/gpu/drm/tidss/tidss_crtc.c
@@ -355,13 +355,11 @@ static void tidss_crtc_destroy_state(struct drm_crtc *crtc,
 static void tidss_crtc_reset(struct drm_crtc *crtc)
 {
 	struct tidss_crtc_state *tstate;
 
 	if (crtc->state)
-		__drm_atomic_helper_crtc_destroy_state(crtc->state);
-
-	kfree(crtc->state);
+		tidss_crtc_destroy_state(crtc, crtc->state);
 
 	tstate = kzalloc(sizeof(*tstate), GFP_KERNEL);
 	if (!tstate) {
 		crtc->state = NULL;
 		return;

-- 
2.50.1