[PATCH xserver] modesetting: Set ppix->fb_id to 0 after removing the fb

[Hans de Goede]

This ensures the fb gets re-added when a shared pixmap is re-used for
a second drmmode_set_scanout_pixmap_cpu call.

Note currently the xserver never re-uses a shared pixmap in this way,
so this is mostly a sanity fix.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 hw/xfree86/drivers/modesetting/drmmode_display.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index 4c55c4e..e8a722e 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -701,6 +701,7 @@ drmmode_set_scanout_pixmap_cpu(xf86CrtcPtr crtc, PixmapPtr ppix)
         if (crtc->randr_crtc->scanout_pixmap) {
             ppriv = msGetPixmapPriv(drmmode, crtc->randr_crtc->scanout_pixmap);
             drmModeRmFB(drmmode->fd, ppriv->fb_id);
+            ppriv->fb_id = 0;
         }
         if (drmmode_crtc->slave_damage) {
             DamageUnregister(drmmode_crtc->slave_damage);
-- 
2.7.4