xserver: Branch 'master' - 5 commits

Keith Packard keithp at kemper.freedesktop.org
Tue May 11 08:40:17 PDT 2010


 dix/resource.c            |   10 ++-
 glx/glxcmds.c             |   23 ++++---
 glx/glxdri.c              |    8 +-
 glx/glxdri2.c             |   16 ++--
 glx/glxdriswrast.c        |    8 +-
 glx/glxscreens.h          |    6 +
 hw/xfree86/dri2/dri2.c    |  148 +++++++++++++++++++++++++++++++++++++++-------
 hw/xfree86/dri2/dri2.h    |    3 
 hw/xfree86/dri2/dri2ext.c |    2 
 include/list.h            |    6 +
 10 files changed, 182 insertions(+), 48 deletions(-)

New commits:
commit 3df22b293c1f1d27e7ce16662744c578d35b5aba
Merge: fa6c701... 9de0e31...
Author: Keith Packard <keithp at keithp.com>
Date:   Tue May 11 08:38:44 2010 -0700

    Merge remote branch 'krh/dri2-resource-fixes'

commit 9de0e31746d5f0d9d39d11c94ec3cbc04a9935fc
Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Thu Apr 29 16:36:10 2010 -0400

    dri2: Take an XID for tracking the DRI2 drawable
    
    Some pixmaps (window pixmaps and scratch pixmaps) don't have the
    drawable->id set and thus DRI2 gets confused when using that field
    for looking up the DRI2 drawable.  Go back to using privates for getting
    at the DRI2 drawable from a DrawablePtr.  We need to keep the resource
    tracking in place so we can remove the DRI2 drawable when the X resource
    it was created for goes away.  Additionally, we also now track the DRI2
    drawable using a client XID so we can reclaim the DRI2 drawable even if
    the client goes before the drawable and doesn't destroy the DRI2 drawable.
    
    Tested-by: Owen W. Taylor <otaylor at fishsoup.net>
    Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>

diff --git a/glx/glxcmds.c b/glx/glxcmds.c
index 087d52e..ec3bbe6 100644
--- a/glx/glxcmds.c
+++ b/glx/glxcmds.c
@@ -512,8 +512,9 @@ __glXGetDrawable(__GLXcontext *glxc, GLXDrawable drawId, ClientPtr client,
     if (!validGlxFBConfigForWindow(client, glxc->config, pDraw, error))
 	return NULL;
 
-    pGlxDraw = glxc->pGlxScreen->createDrawable(glxc->pGlxScreen,
-						pDraw, GLX_DRAWABLE_WINDOW,
+    pGlxDraw = glxc->pGlxScreen->createDrawable(client, glxc->pGlxScreen,
+						pDraw, drawId,
+						GLX_DRAWABLE_WINDOW,
 						drawId, glxc->config);
 
     /* since we are creating the drawablePrivate, drawId should be new */
@@ -1104,15 +1105,17 @@ __glXDrawableRelease(__GLXdrawable *drawable)
 }
 
 static int 
-DoCreateGLXDrawable(ClientPtr client, __GLXscreen *pGlxScreen, __GLXconfig *config,
-		    DrawablePtr pDraw, XID glxDrawableId, int type)
+DoCreateGLXDrawable(ClientPtr client, __GLXscreen *pGlxScreen,
+		    __GLXconfig *config, DrawablePtr pDraw, XID drawableId,
+		    XID glxDrawableId, int type)
 {
     __GLXdrawable *pGlxDraw;
 
     if (pGlxScreen->pScreen != pDraw->pScreen)
 	return BadMatch;
 
-    pGlxDraw = pGlxScreen->createDrawable(pGlxScreen, pDraw, type,
+    pGlxDraw = pGlxScreen->createDrawable(client, pGlxScreen, pDraw,
+					  drawableId, type,
 					  glxDrawableId, config);
     if (pGlxDraw == NULL)
 	return BadAlloc;
@@ -1125,7 +1128,7 @@ DoCreateGLXDrawable(ClientPtr client, __GLXscreen *pGlxScreen, __GLXconfig *conf
     /* Add the glx drawable under the XID of the underlying X drawable
      * too.  That way we'll get a callback in DrawableGone and can
      * clean up properly when the drawable is destroyed. */
-    if (pDraw->id != glxDrawableId &&
+    if (drawableId != glxDrawableId &&
 	!AddResource(pDraw->id, __glXDrawableRes, pGlxDraw)) {
 	pGlxDraw->destroy (pGlxDraw);
 	return BadAlloc;
@@ -1153,7 +1156,7 @@ DoCreateGLXPixmap(ClientPtr client, __GLXscreen *pGlxScreen, __GLXconfig *config
 	return BadPixmap;
     }
 
-    err = DoCreateGLXDrawable(client, pGlxScreen, config, pDraw,
+    err = DoCreateGLXDrawable(client, pGlxScreen, config, pDraw, drawableId,
 			      glxDrawableId, GLX_DRAWABLE_PIXMAP);
 
     return err;
@@ -1316,7 +1319,8 @@ DoCreatePbuffer(ClientPtr client, int screenNum, XID fbconfigId,
 	return BadAlloc;
 
     return DoCreateGLXDrawable(client, pGlxScreen, config, &pPixmap->drawable,
-			       glxDrawableId, GLX_DRAWABLE_PBUFFER);
+			       glxDrawableId, glxDrawableId,
+			       GLX_DRAWABLE_PBUFFER);
 }
 
 int __glXDisp_CreatePbuffer(__GLXclientState *cl, GLbyte *pc)
@@ -1439,7 +1443,8 @@ int __glXDisp_CreateWindow(__GLXclientState *cl, GLbyte *pc)
 	return err;
 
     return DoCreateGLXDrawable(client, pGlxScreen, config,
-			       pDraw, req->glxwindow, GLX_DRAWABLE_WINDOW);
+			       pDraw, req->window,
+			       req->glxwindow, GLX_DRAWABLE_WINDOW);
 }
 
 int __glXDisp_DestroyWindow(__GLXclientState *cl, GLbyte *pc)
diff --git a/glx/glxdri.c b/glx/glxdri.c
index 9810a73..1d8c902 100644
--- a/glx/glxdri.c
+++ b/glx/glxdri.c
@@ -683,10 +683,12 @@ __glXDRIscreenCreateContext(__GLXscreen *baseScreen,
 }
 
 static __GLXdrawable *
-__glXDRIscreenCreateDrawable(__GLXscreen *screen,
+__glXDRIscreenCreateDrawable(ClientPtr client,
+			     __GLXscreen *screen,
 			     DrawablePtr pDraw,
-			     int type,
 			     XID drawId,
+			     int type,
+			     XID glxDrawId,
 			     __GLXconfig *glxConfig)
 {
     __GLXDRIscreen *driScreen = (__GLXDRIscreen *) screen;
@@ -700,7 +702,7 @@ __glXDRIscreenCreateDrawable(__GLXscreen *screen,
 	return NULL;
 
     if (!__glXDrawableInit(&private->base, screen,
-			   pDraw, type, drawId, glxConfig)) {
+			   pDraw, type, glxDrawId, glxConfig)) {
         xfree(private);
 	return NULL;
     }
diff --git a/glx/glxdri2.c b/glx/glxdri2.c
index c34e29a..bad4516 100644
--- a/glx/glxdri2.c
+++ b/glx/glxdri2.c
@@ -430,10 +430,12 @@ __glXDRIscreenCreateContext(__GLXscreen *baseScreen,
 }
 
 static __GLXdrawable *
-__glXDRIscreenCreateDrawable(__GLXscreen *screen,
+__glXDRIscreenCreateDrawable(ClientPtr client,
+			     __GLXscreen *screen,
 			     DrawablePtr pDraw,
-			     int type,
 			     XID drawId,
+			     int type,
+			     XID glxDrawId,
 			     __GLXconfig *glxConfig)
 {
     __GLXDRIscreen *driScreen = (__GLXDRIscreen *) screen;
@@ -446,7 +448,7 @@ __glXDRIscreenCreateDrawable(__GLXscreen *screen,
 
     private->screen = driScreen;
     if (!__glXDrawableInit(&private->base, screen,
-			   pDraw, type, drawId, glxConfig)) {
+			   pDraw, type, glxDrawId, glxConfig)) {
         xfree(private);
 	return NULL;
     }
@@ -457,7 +459,7 @@ __glXDRIscreenCreateDrawable(__GLXscreen *screen,
     private->base.waitGL	= __glXDRIdrawableWaitGL;
     private->base.waitX		= __glXDRIdrawableWaitX;
 
-    if (DRI2CreateDrawable(pDraw)) {
+    if (DRI2CreateDrawable(client, pDraw, drawId)) {
 	    xfree(private);
 	    return NULL;
     }
diff --git a/glx/glxdriswrast.c b/glx/glxdriswrast.c
index 918383c..4ba448a 100644
--- a/glx/glxdriswrast.c
+++ b/glx/glxdriswrast.c
@@ -301,10 +301,12 @@ glxChangeGC(GCPtr gc, BITS32 mask, CARD32 val)
 }
 
 static __GLXdrawable *
-__glXDRIscreenCreateDrawable(__GLXscreen *screen,
+__glXDRIscreenCreateDrawable(ClientPtr client,
+			     __GLXscreen *screen,
 			     DrawablePtr pDraw,
-			     int type,
 			     XID drawId,
+			     int type,
+			     XID glxDrawId,
 			     __GLXconfig *glxConfig)
 {
     __GLXDRIscreen *driScreen = (__GLXDRIscreen *) screen;
@@ -319,7 +321,7 @@ __glXDRIscreenCreateDrawable(__GLXscreen *screen,
 
     private->screen = driScreen;
     if (!__glXDrawableInit(&private->base, screen,
-			   pDraw, type, drawId, glxConfig)) {
+			   pDraw, type, glxDrawId, glxConfig)) {
         xfree(private);
 	return NULL;
     }
diff --git a/glx/glxscreens.h b/glx/glxscreens.h
index d52099f..861e03c 100644
--- a/glx/glxscreens.h
+++ b/glx/glxscreens.h
@@ -134,10 +134,12 @@ struct __GLXscreen {
 				    __GLXconfig *modes,
 				    __GLXcontext *shareContext);
 
-    __GLXdrawable *(*createDrawable)(__GLXscreen *context,
+    __GLXdrawable *(*createDrawable)(ClientPtr client,
+				     __GLXscreen *context,
 				     DrawablePtr pDraw,
-				     int type,
 				     XID drawId,
+				     int type,
+				     XID glxDrawId,
 				     __GLXconfig *modes);
     int            (*swapInterval)  (__GLXdrawable *drawable,
 				     int interval);
diff --git a/hw/xfree86/dri2/dri2.c b/hw/xfree86/dri2/dri2.c
index 6c4dabc..11442d0 100644
--- a/hw/xfree86/dri2/dri2.c
+++ b/hw/xfree86/dri2/dri2.c
@@ -37,6 +37,7 @@
 #include <errno.h>
 #include <xf86drm.h>
 #include "xf86Module.h"
+#include "list.h"
 #include "scrnintstr.h"
 #include "windowstr.h"
 #include "dixstruct.h"
@@ -50,12 +51,18 @@ CARD8 dri2_minor;
 
 static int           dri2ScreenPrivateKeyIndex;
 static DevPrivateKey dri2ScreenPrivateKey = &dri2ScreenPrivateKeyIndex;
+static int dri2WindowPrivateKeyIndex;
+static DevPrivateKey dri2WindowPrivateKey = &dri2WindowPrivateKeyIndex;
+static int dri2PixmapPrivateKeyIndex;
+static DevPrivateKey dri2PixmapPrivateKey = &dri2PixmapPrivateKeyIndex;
 static RESTYPE       dri2DrawableRes;
 
 typedef struct _DRI2Screen *DRI2ScreenPtr;
 
 typedef struct _DRI2Drawable {
     DRI2ScreenPtr        dri2_screen;
+    DrawablePtr		 drawable;
+    struct list		 reference_list;
     int			 width;
     int			 height;
     DRI2BufferPtr	*buffers;
@@ -74,6 +81,7 @@ typedef struct _DRI2Drawable {
 
 typedef struct _DRI2Screen {
     ScreenPtr			 screen;
+    int				 refcnt;
     unsigned int		 numDrivers;
     const char			**driverNames;
     const char			*deviceName;
@@ -99,35 +107,33 @@ DRI2GetScreen(ScreenPtr pScreen)
 static DRI2DrawablePtr
 DRI2GetDrawable(DrawablePtr pDraw)
 {
-    DRI2DrawablePtr pPriv;
-    int rc;
+    WindowPtr pWin;
+    PixmapPtr pPixmap;
 
-    rc = dixLookupResourceByType((pointer *) &pPriv, pDraw->id,
-				 dri2DrawableRes, NULL, DixReadAccess);
-    if (rc != Success)
-	return NULL;
-
-    return pPriv;
+    if (pDraw->type == DRAWABLE_WINDOW) {
+	pWin = (WindowPtr) pDraw;
+	return dixLookupPrivate(&pWin->devPrivates, dri2WindowPrivateKey);
+    } else {
+	pPixmap = (PixmapPtr) pDraw;
+	return dixLookupPrivate(&pPixmap->devPrivates, dri2PixmapPrivateKey);
+    }
 }
 
-int
-DRI2CreateDrawable(DrawablePtr pDraw)
+static DRI2DrawablePtr
+DRI2AllocateDrawable(DrawablePtr pDraw)
 {
     DRI2ScreenPtr   ds = DRI2GetScreen(pDraw->pScreen);
     DRI2DrawablePtr pPriv;
     CARD64          ust;
-    int		    rc;
-
-    rc = dixLookupResourceByType((pointer *) &pPriv, pDraw->id,
-				 dri2DrawableRes, NULL, DixReadAccess);
-    if (rc == Success || rc != BadValue)
-	return rc;
+    WindowPtr pWin;
+    PixmapPtr pPixmap;
 
     pPriv = xalloc(sizeof *pPriv);
     if (pPriv == NULL)
-	return BadAlloc;
+	return NULL;
 
     pPriv->dri2_screen = ds;
+    pPriv->drawable = pDraw;
     pPriv->width = pDraw->width;
     pPriv->height = pDraw->height;
     pPriv->buffers = NULL;
@@ -145,9 +151,77 @@ DRI2CreateDrawable(DrawablePtr pDraw)
     pPriv->swap_limit = 1; /* default to double buffering */
     pPriv->last_swap_msc = 0;
     pPriv->last_swap_ust = 0;
+    list_init(&pPriv->reference_list);
+
+    if (pDraw->type == DRAWABLE_WINDOW) {
+	pWin = (WindowPtr) pDraw;
+	dixSetPrivate(&pWin->devPrivates, dri2WindowPrivateKey, pPriv);
+    } else {
+	pPixmap = (PixmapPtr) pDraw;
+	dixSetPrivate(&pPixmap->devPrivates, dri2PixmapPrivateKey, pPriv);
+    }
+
+    return pPriv;
+}
+
+typedef struct DRI2DrawableRefRec {
+    XID id;
+    XID dri2_id;
+    struct list link;
+} DRI2DrawableRefRec, *DRI2DrawableRefPtr;
+
+static DRI2DrawableRefPtr
+DRI2LookupDrawableRef(DRI2DrawablePtr pPriv, XID id)
+{
+    DRI2DrawableRefPtr ref;
+
+    list_for_each_entry(ref, &pPriv->reference_list, link) {
+	if (ref->id == id)
+	    return ref;
+    }
+    
+    return NULL;
+}
+
+static int
+DRI2AddDrawableRef(DRI2DrawablePtr pPriv, XID id, XID dri2_id)
+{
+    DRI2DrawableRefPtr ref;
+
+    ref = malloc(sizeof *ref);
+    if (ref == NULL)
+	return BadAlloc;
+	
+    if (!AddResource(dri2_id, dri2DrawableRes, pPriv))
+	return BadAlloc;
+    if (!DRI2LookupDrawableRef(pPriv, id))
+	if (!AddResource(id, dri2DrawableRes, pPriv))
+	    return BadAlloc;
+
+    ref->id = id;
+    ref->dri2_id = dri2_id; 
+    list_add(&ref->link, &pPriv->reference_list);
+
+    return Success;
+}
 
-    if (!AddResource(pDraw->id, dri2DrawableRes, pPriv))
+int
+DRI2CreateDrawable(ClientPtr client, DrawablePtr pDraw, XID id)
+{
+    DRI2DrawablePtr pPriv;
+    XID dri2_id;
+    int rc;
+
+    pPriv = DRI2GetDrawable(pDraw);
+    if (pPriv == NULL)
+	pPriv = DRI2AllocateDrawable(pDraw);
+    if (pPriv == NULL)
 	return BadAlloc;
+    
+    dri2_id = FakeClientID(client->index);
+    rc = DRI2AddDrawableRef(pPriv, id, dri2_id);
+    if (rc != Success)
+	return rc;
 
     return Success;
 }
@@ -156,13 +230,45 @@ static int DRI2DrawableGone(pointer p, XID id)
 {
     DRI2DrawablePtr pPriv = p;
     DRI2ScreenPtr   ds = pPriv->dri2_screen;
-    DrawablePtr     root;
+    DRI2DrawableRefPtr ref, next;
+    WindowPtr pWin;
+    PixmapPtr pPixmap;
+    DrawablePtr pDraw;
     int i;
 
-    root = &WindowTable[ds->screen->myNum]->drawable;
+    list_for_each_entry_safe(ref, next, &pPriv->reference_list, link) {
+	if (ref->dri2_id == id) {
+	    list_del(&ref->link);
+	    /* If this was the last ref under this X drawable XID,
+	     * unregister the X drawable resource. */
+	    if (!DRI2LookupDrawableRef(pPriv, ref->id))
+		FreeResourceByType(ref->id, dri2DrawableRes, TRUE);
+	    free(ref);
+	    break;
+	}
+
+	if (ref->id == id) {
+	    list_del(&ref->link);
+	    FreeResourceByType(ref->dri2_id, dri2DrawableRes, TRUE);
+	    free(ref);
+	}
+    }
+
+    if (!list_is_empty(&pPriv->reference_list))
+	return Success;
+
+    pDraw = pPriv->drawable;
+    if (pDraw->type == DRAWABLE_WINDOW) {
+	pWin = (WindowPtr) pDraw;
+	dixSetPrivate(&pWin->devPrivates, dri2WindowPrivateKey, NULL);
+    } else {
+	pPixmap = (PixmapPtr) pDraw;
+	dixSetPrivate(&pPixmap->devPrivates, dri2PixmapPrivateKey, NULL);
+    }
+
     if (pPriv->buffers != NULL) {
 	for (i = 0; i < pPriv->bufferCount; i++)
-	    (*ds->DestroyBuffer)(root, pPriv->buffers[i]);
+	    (*ds->DestroyBuffer)(pDraw, pPriv->buffers[i]);
 
 	xfree(pPriv->buffers);
     }
diff --git a/hw/xfree86/dri2/dri2.h b/hw/xfree86/dri2/dri2.h
index ce8a5df..5415a0b 100644
--- a/hw/xfree86/dri2/dri2.h
+++ b/hw/xfree86/dri2/dri2.h
@@ -198,7 +198,8 @@ extern _X_EXPORT Bool DRI2Connect(ScreenPtr pScreen,
 
 extern _X_EXPORT Bool DRI2Authenticate(ScreenPtr pScreen, drm_magic_t magic);
 
-extern _X_EXPORT int DRI2CreateDrawable(DrawablePtr pDraw);
+extern _X_EXPORT int DRI2CreateDrawable(ClientPtr client,
+					DrawablePtr pDraw, XID id);
 
 extern _X_EXPORT void DRI2DestroyDrawable(DrawablePtr pDraw);
 
diff --git a/hw/xfree86/dri2/dri2ext.c b/hw/xfree86/dri2/dri2ext.c
index 17df130..58eaa10 100644
--- a/hw/xfree86/dri2/dri2ext.c
+++ b/hw/xfree86/dri2/dri2ext.c
@@ -167,7 +167,7 @@ ProcDRI2CreateDrawable(ClientPtr client)
 		       &pDrawable, &status))
 	return status;
 
-    status = DRI2CreateDrawable(pDrawable);
+    status = DRI2CreateDrawable(client, pDrawable, stuff->drawable);
     if (status != Success)
 	return status;
 
commit 32381363cd8f43aeb741bad70bcf96a287dac0c9
Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Sat May 1 13:15:00 2010 -0400

    list.h: Add list_for_each_entry_safe()
    
    Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
    Reviewed-by: Adam Jackson <ajax at redhat.com>

diff --git a/include/list.h b/include/list.h
index a126a65..89dc29d 100644
--- a/include/list.h
+++ b/include/list.h
@@ -94,4 +94,10 @@ list_is_empty(struct list *head)
 	 &pos->member != (head);					\
 	 pos = __container_of(pos->member.next, pos, member))
 
+#define list_for_each_entry_safe(pos, next, head, member)		\
+    for (pos = __container_of((head)->next, pos, member),		\
+	 next = __container_of(pos->member.next, pos, member);		\
+	 &pos->member != (head);					\
+	 pos = next, next = __container_of(next->member.next, next, member))
+
 #endif
commit 4a8a615d01b9ed18c272414bd11dc2fc661727e5
Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Sat May 1 13:13:54 2010 -0400

    glxdri2: Hard-code the extension version we need
    
    If we use the #define'd version from dri_interface.h, the server will
    require at least that version of the extension.  If we're compiling against
    a dri_interface.h with a newer version we don't really require, glxdri2
    will require a too high version of the extension.
    
    The right approach is to just hard-code the version we need instead of
    using the #defines.
    
    Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
    Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
    Reviewed-by: Adam Jackson <ajax at redhat.com>

diff --git a/glx/glxdri2.c b/glx/glxdri2.c
index 74d6ebc..c34e29a 100644
--- a/glx/glxdri2.c
+++ b/glx/glxdri2.c
@@ -653,7 +653,7 @@ initializeExtensions(__GLXDRIscreen *screen)
 
 #ifdef __DRI2_FLUSH
 	if (strcmp(extensions[i]->name, __DRI2_FLUSH) == 0 &&
-	    extensions[i]->version >= __DRI2_FLUSH_VERSION) {
+	    extensions[i]->version >= 3) {
 		screen->flush = (__DRI2flushExtension *) extensions[i];
 	}
 #endif
@@ -713,11 +713,11 @@ __glXDRIscreenProbe(ScreenPtr pScreen)
     
     for (i = 0; extensions[i]; i++) {
         if (strcmp(extensions[i]->name, __DRI_CORE) == 0 &&
-	    extensions[i]->version >= __DRI_CORE_VERSION) {
+	    extensions[i]->version >= 1) {
 		screen->core = (const __DRIcoreExtension *) extensions[i];
 	}
         if (strcmp(extensions[i]->name, __DRI_DRI2) == 0 &&
-	    extensions[i]->version >= __DRI_DRI2_VERSION) {
+	    extensions[i]->version >= 1) {
 		screen->dri2 = (const __DRIdri2Extension *) extensions[i];
 	}
     }
commit 6d7ba5e0fcb5d1bce6bb213dec009f3a0f802d26
Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Sat May 1 13:07:46 2010 -0400

    dix: Update element count in FreeResource*()
    
    FreeResource() keeps clientTable[cid].elements up to date with the
    number of resources allocated to the client.  The other free
    resource functions (FreeResourceByType(),
    FreeClientNeverRetainResources() and FreeClientResources()) don't
    maintain this invariant.
    
    Typically, the only consequence is that the element count is too high
    and we end up allocating the hash table bigger than necessary.  However,
    FreeResource() also relies on the element count to restart the search if
    the list of resources has been changed during a resource destruction
    callback.  Since FreeResourceByType() doesn't update the count, if we call
    that from a resource destruction callback from FreeResource(), the
    loop isn't restarted and we end up following an invalid next pointer.
    
    Furthermore, LookupClientResourceComplex() and
    FreeClientNeverRetainResources() don't use the element count to detect
    if a callback deleted a resource and may end up following an invalid
    next pointer if the resource system is called into recursively.
    
    Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
    Reviewed-by: Keith Packard <keithp at keithp.com>

diff --git a/dix/resource.c b/dix/resource.c
index 91d0cfb..ab3762e 100644
--- a/dix/resource.c
+++ b/dix/resource.c
@@ -589,6 +589,7 @@ FreeResourceByType(XID id, RESTYPE type, Bool skipFree)
 			      res->value, TypeNameString(res->type));
 #endif		    		    
 		*prev = res->next;
+		clientTable[cid].elements--;
 
 		CallResourceStateCallback(ResourceStateFreeing, res);
 
@@ -734,12 +735,14 @@ FreeClientNeverRetainResources(ClientPtr client)
     ResourcePtr *resources;
     ResourcePtr this;
     ResourcePtr *prev;
-    int j;
+    int j, elements;
+    int *eltptr;
 
     if (!client)
 	return;
 
     resources = clientTable[client->index].resources;
+    eltptr = &clientTable[client->index].elements;
     for (j=0; j < clientTable[client->index].buckets; j++) 
     {
 	prev = &resources[j];
@@ -753,11 +756,15 @@ FreeClientNeverRetainResources(ClientPtr client)
 			      this->value, TypeNameString(this->type));
 #endif		    
 		*prev = this->next;
+		clientTable[client->index].elements--;
 
 		CallResourceStateCallback(ResourceStateFreeing, this);
 
+		elements = *eltptr;
 		(*DeleteFuncs[rtype & TypeMask])(this->value, this->id);
 		xfree(this);
+		if (*eltptr != elements)
+		    prev = &resources[j]; /* prev may no longer be valid */
 	    }
 	    else
 		prev = &this->next;
@@ -804,6 +811,7 @@ FreeClientResources(ClientPtr client)
 			  this->value, TypeNameString(this->type));
 #endif		    
 	    *head = this->next;
+	    clientTable[client->index].elements--;
 
 	    CallResourceStateCallback(ResourceStateFreeing, this);
 


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