linux-kernel - [PATCH 1/3] drm/fb_cma_helper: do not free fbdev if there is none

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Message-Id: <20161020003221.2941-2-stefan@agner.ch>
Date:   Wed, 19 Oct 2016 17:32:19 -0700
From:   Stefan Agner <stefan@...er.ch>
To:     daniel.vetter@...ll.ch, meng.yi@....com,
        dri-devel@...ts.freedesktop.org
Cc:     alison.wang@...escale.com, jianwei.wang.chn@...il.com,
        linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH 1/3] drm/fb_cma_helper: do not free fbdev if there is none

If fbdev emulation is not in use (or not built-in), fb_helper.fbdev
is NULL. Don't call calling drm_fbdev_cma_defio_fini in this case.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 drivers/gpu/drm/drm_fb_cma_helper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index 1fd6eac..12d654d 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -557,7 +557,8 @@ EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
 void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
 {
 	drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
-	drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
+	if (fbdev_cma->fb_helper.fbdev)
+		drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
 	drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);
 
 	if (fbdev_cma->fb) {
-- 
2.10.0