From: Noralf Trønnes noralf@tronnes.org
commit 6e3f17ee73f7e3c2ef0e2c8fd8624b2ece8ef2c9 upstream.
Hotplug can happen while drm_fbdev_generic_setup() is running so move drm_client_add() call after setup is done to avoid drm_fbdev_client_hotplug() running in two threads at the same time.
Fixes: 9060d7f49376 ("drm/fb-helper: Finish the generic fbdev emulation") Cc: stable@vger.kernel.org Reported-by: Daniel Vetter daniel.vetter@ffwll.ch Signed-off-by: Noralf Trønnes noralf@tronnes.org Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Link: https://patchwork.freedesktop.org/patch/msgid/20190401141358.25309-1-noralf@... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/drm_fb_helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -3317,8 +3317,6 @@ int drm_fbdev_generic_setup(struct drm_d return ret; }
- drm_client_add(&fb_helper->client); - if (!preferred_bpp) preferred_bpp = dev->mode_config.preferred_depth; if (!preferred_bpp) @@ -3329,6 +3327,8 @@ int drm_fbdev_generic_setup(struct drm_d if (ret) DRM_DEV_DEBUG(dev->dev, "client hotplug ret=%d\n", ret);
+ drm_client_add(&fb_helper->client); + return 0; } EXPORT_SYMBOL(drm_fbdev_generic_setup);