linux-kernel - [PATCH 4.19 118/118] drm/vc4: fix fb references in async update

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Message-Id: <20190613075651.218844366@linuxfoundation.org>
Date:   Thu, 13 Jun 2019 10:34:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Helen Koike <helen.koike@...labora.com>
Subject: [PATCH 4.19 118/118] drm/vc4: fix fb references in async update

From: Helen Koike <helen.koike@...labora.com>

commit c16b85559dcfb5a348cc085a7b4c75ed49b05e2c upstream.

Async update callbacks are expected to set the old_fb in the new_state
so prepare/cleanup framebuffers are balanced.

Calling drm_atomic_set_fb_for_plane() (which gets a reference of the new
fb and put the old fb) is not required, as it's taken care by
drm_mode_cursor_universal() when calling drm_atomic_helper_update_plane().

Cc: <stable@...r.kernel.org> # v4.19+
Fixes: 539c320bfa97 ("drm/vc4: update cursors asynchronously through atomic")
Suggested-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Helen Koike <helen.koike@...labora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603165610.24614-5-helen.koike@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vc4/vc4_plane.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -818,6 +818,7 @@ static void vc4_plane_atomic_async_updat
 		drm_atomic_set_fb_for_plane(plane->state, state->fb);
 	}
 
+	swap(plane->state->fb, state->fb);
 	/* Set the cursor's position on the screen.  This is the
 	 * expected change from the drm_mode_cursor_universal()
 	 * helper.