[PATCH xf86-video-ati 1/2] present: Clear drmmode->fb_id before calling set_mode_major for unflip

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

Without this, drmmode_set_mode_major may just re-set the FB for the
last flipped BO, in which case the display will probably freeze.

Reproduction recipe: Enable rotation while a fullscreen client is
flipping.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 src/radeon_present.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/radeon_present.c b/src/radeon_present.c
index 68be1c7..286b3f4 100644
--- a/src/radeon_present.c
+++ b/src/radeon_present.c
@@ -382,6 +382,12 @@ radeon_present_unflip(ScreenPtr screen, uint64_t event_id)
 	return;
 
 modeset:
+    /* info->drmmode.fb_id still points to the FB for the last flipped BO.
+     * Clear it, drmmode_set_mode_major will re-create it
+     */
+    drmModeRmFB(info->drmmode.fd, info->drmmode.fb_id);
+    info->drmmode.fb_id = 0;
+
     for (i = 0; i < config->num_crtc; i++) {
 	xf86CrtcPtr crtc = config->crtc[i];
 	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
-- 
2.7.0