The GPU may still have a reference to the SHM segment which would only be finally released when the Pixmap is destroy. So we can only detach the SHM segment (and thereby making the memory unaccessible) after the backend has had a chance to flush any remaining references.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=85058 Signed-off-by: Chris Wilson <[email protected]> --- Xext/shm.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/Xext/shm.c b/Xext/shm.c index 4dad8b6..b787918 100644 --- a/Xext/shm.c +++ b/Xext/shm.c @@ -248,21 +248,20 @@ ShmDestroyPixmap(PixmapPtr pPixmap) { ScreenPtr pScreen = pPixmap->drawable.pScreen; ShmScrPrivateRec *screen_priv = ShmGetScreenPriv(pScreen); + void *shmdesc = NULL; Bool ret; - if (pPixmap->refcnt == 1) { - ShmDescPtr shmdesc; - - shmdesc = (ShmDescPtr) dixLookupPrivate(&pPixmap->devPrivates, - shmPixmapPrivateKey); - if (shmdesc) - ShmDetachSegment((void *) shmdesc, pPixmap->drawable.id); - } + if (pPixmap->refcnt == 1) + shmdesc = dixLookupPrivate(&pPixmap->devPrivates, shmPixmapPrivateKey); pScreen->DestroyPixmap = screen_priv->destroyPixmap; ret = (*pScreen->DestroyPixmap) (pPixmap); screen_priv->destroyPixmap = pScreen->DestroyPixmap; pScreen->DestroyPixmap = ShmDestroyPixmap; + + if (shmdesc) + ShmDetachSegment(shmdesc, pPixmap->drawable.id); + return ret; } -- 1.9.1 _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
