4.19-stable review patch. If anyone has any objections, please let me know.
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From: Sean Paul seanpaul@chromium.org
[ Upstream commit c232e9f41b136c141df9938024e521191a7b910d ]
Instead of always re-initializing the variables we need to clean up on out, move the re-initialization into the branch that goes back to retry label.
This is a lateral move right now, but will allow us to pull out the modeset locking into common code. I kept this change separate to make things easier to review.
Changes in v2: - None
Reviewed-by: Daniel Vetter daniel@ffwll.ch Signed-off-by: Sean Paul seanpaul@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20181129150423.239081-2-sean@p... Stable-dep-of: b6802b61a9d0 ("drm/crtc: fix uninitialized variable use even harder") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_crtc.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 22eba10af165d..82ad38ee3fea7 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -567,9 +567,9 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, struct drm_mode_crtc *crtc_req = data; struct drm_crtc *crtc; struct drm_plane *plane; - struct drm_connector **connector_set, *connector; - struct drm_framebuffer *fb; - struct drm_display_mode *mode; + struct drm_connector **connector_set = NULL, *connector; + struct drm_framebuffer *fb = NULL; + struct drm_display_mode *mode = NULL; struct drm_mode_set set; uint32_t __user *set_connectors_ptr; struct drm_modeset_acquire_ctx ctx; @@ -601,10 +601,6 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, mutex_lock(&crtc->dev->mode_config.mutex); drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE); retry: - connector_set = NULL; - fb = NULL; - mode = NULL; - ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx); if (ret) goto out; @@ -767,6 +763,12 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, } kfree(connector_set); drm_mode_destroy(dev, mode); + + /* In case we need to retry... */ + connector_set = NULL; + fb = NULL; + mode = NULL; + if (ret == -EDEADLK) { ret = drm_modeset_backoff(&ctx); if (!ret)