From 29dc0d1de18239cf3ef8bab578b8321ed340d81c Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 22 Mar 2017 22:50:49 +0100 Subject: [PATCH] drm: Roll out acquire context for the page_flip ioctl Again just prep work. Reviewed-by: Harry Wentland Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-11-daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_plane.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c index 8535dc17db7e..62e833ffeffd 100644 --- a/drivers/gpu/drm/drm_plane.c +++ b/drivers/gpu/drm/drm_plane.c @@ -803,6 +803,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, struct drm_framebuffer *fb = NULL; struct drm_pending_vblank_event *e = NULL; u32 target_vblank = page_flip->sequence; + struct drm_modeset_acquire_ctx ctx; int ret = -EINVAL; if (!drm_core_check_feature(dev, DRIVER_MODESET)) @@ -866,7 +867,16 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, return -EINVAL; } - drm_modeset_lock_crtc(crtc, crtc->primary); + drm_modeset_acquire_init(&ctx, 0); +retry: + ret = drm_modeset_lock(&crtc->mutex, &ctx); + if (ret) + goto out; + ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx); + if (ret) + goto out; + crtc->acquire_ctx = &ctx; + if (crtc->primary->fb == NULL) { /* The framebuffer is currently unbound, presumably * due to a hotplug event, that userspace has not @@ -944,7 +954,14 @@ out: if (crtc->primary->old_fb) drm_framebuffer_put(crtc->primary->old_fb); crtc->primary->old_fb = NULL; - drm_modeset_unlock_crtc(crtc); + + if (ret == -EDEADLK) { + drm_modeset_backoff(&ctx); + goto retry; + } + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); return ret; } -- 2.20.1