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authorThomas Zimmermann <tzimmermann@suse.de>2023-02-16 17:06:20 +0300
committerThomas Zimmermann <tzimmermann@suse.de>2023-02-21 15:26:18 +0300
commit3fb1f62f80a1d249260db5ea9e22c51e52fab9ae (patch)
tree55e0969d0ec4048a2a937187516e9476500b130d /drivers/gpu/drm/omapdrm
parentfb073aa27a7e1b8c968c05c5447a77d49e832ec5 (diff)
downloadlinux-3fb1f62f80a1d249260db5ea9e22c51e52fab9ae.tar.xz
drm/fb-helper: Remove drm_fb_helper_unprepare() from drm_fb_helper_fini()
Move drm_fb_helper_unprepare() from drm_fb_helper_fini() into the calling fbdev implementation. Avoids a possible stale mutex with generic fbdev code. As indicated by its name, drm_fb_helper_prepare() prepares struct drm_fb_helper before setting up the fbdev support with a call to drm_fb_helper_init(). In legacy fbdev emulation, this happens next to each other. If successful, drm_fb_helper_fini() later tear down the fbdev device and also unprepare via drm_fb_helper_unprepare(). Generic fbdev emulation prepares struct drm_fb_helper immediately after allocating the instance. It only calls drm_fb_helper_init() as part of processing a hotplug event. If the hotplug-handling fails, it runs drm_fb_helper_fini(). This unprepares the fb-helper instance and the next hotplug event runs on stale data. Solve this by moving drm_fb_helper_unprepare() from drm_fb_helper_fini() into the fbdev implementations. Call it right before freeing the fb-helper instance. Fixes: 643231b28380 ("drm/fbdev-generic: Minimize hotplug error handling") Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Javier Martinez Canillas <javierm@redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: David Airlie <airlied@gmail.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230216140620.17699-1-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/omapdrm')
-rw-r--r--drivers/gpu/drm/omapdrm/omap_fbdev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index fc5f52d567c6..84429728347f 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -256,6 +256,7 @@ void omap_fbdev_init(struct drm_device *dev)
fini:
drm_fb_helper_fini(helper);
fail:
+ drm_fb_helper_unprepare(helper);
kfree(fbdev);
dev_warn(dev->dev, "omap_fbdev_init failed\n");
@@ -286,6 +287,7 @@ void omap_fbdev_fini(struct drm_device *dev)
if (fbdev->fb)
drm_framebuffer_remove(fbdev->fb);
+ drm_fb_helper_unprepare(helper);
kfree(fbdev);
priv->fbdev = NULL;