Unwrap/rewrap EnterVT/LeaveVT completely, Fixes 28998

Because some EnterVT code needs to remove it self from the
call chain, we need to fix all of the wrappers to correctly
unwrap/rewrap during the call chain. This is a follow-on to the fix
for bug 27114 in commit 68a9ee8370.

Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Jesse Barnes <jesse.barnes@intel.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Tiago Vignatti <tiago.vignatti@nokia.com>

glx/glxdri.c

@@ -866,12 +866,21 @@ static const char dri_driver_path[] = DRI_DRIVER_PATH;
 static Bool
 glxDRIEnterVT (int index, int flags)
 {
+    ScrnInfoPtr scrn = xf86Screens[index];
+    Bool	ret;
     __GLXDRIscreen *screen = (__GLXDRIscreen *) 
 	glxGetScreen(screenInfo.screens[index]);
 
     LogMessage(X_INFO, "AIGLX: Resuming AIGLX clients after VT switch\n");
 
-    if (!(*screen->enterVT) (index, flags))
+    scrn->EnterVT = screen->enterVT;
+
+    ret = scrn->EnterVT (index, flags);
+
+    screen->enterVT = scrn->EnterVT;
+    scrn->EnterVT = glxDRIEnterVT;
+
+    if (!ret)
 	return FALSE;
     
     glxResumeClients();
@@ -882,6 +891,7 @@ glxDRIEnterVT (int index, int flags)
 static void
 glxDRILeaveVT (int index, int flags)
 {
+    ScrnInfoPtr scrn = xf86Screens[index];
     __GLXDRIscreen *screen = (__GLXDRIscreen *)
 	glxGetScreen(screenInfo.screens[index]);
 
@@ -889,7 +899,10 @@ glxDRILeaveVT (int index, int flags)
 
     glxSuspendClients();
 
-    return (*screen->leaveVT) (index, flags);
+    scrn->LeaveVT = screen->leaveVT;
+    (*screen->leaveVT) (index, flags);
+    screen->leaveVT = scrn->LeaveVT;
+    scrn->LeaveVT = glxDRILeaveVT;
 }
 
 static void

glx/glxdri2.c

@@ -605,12 +605,21 @@ static const char dri_driver_path[] = DRI_DRIVER_PATH;
 static Bool
 glxDRIEnterVT (int index, int flags)
 {
+    ScrnInfoPtr scrn = xf86Screens[index];
+    Bool	ret;
     __GLXDRIscreen *screen = (__GLXDRIscreen *) 
 	glxGetScreen(screenInfo.screens[index]);
 
     LogMessage(X_INFO, "AIGLX: Resuming AIGLX clients after VT switch\n");
 
-    if (!(*screen->enterVT) (index, flags))
+    scrn->EnterVT = screen->enterVT;
+
+    ret = scrn->EnterVT (index, flags);
+
+    screen->enterVT = scrn->EnterVT;
+    scrn->EnterVT = glxDRIEnterVT;
+
+    if (!ret)
 	return FALSE;
     
     glxResumeClients();
@@ -621,6 +630,7 @@ glxDRIEnterVT (int index, int flags)
 static void
 glxDRILeaveVT (int index, int flags)
 {
+    ScrnInfoPtr scrn = xf86Screens[index];
     __GLXDRIscreen *screen = (__GLXDRIscreen *)
 	glxGetScreen(screenInfo.screens[index]);
 
@@ -628,7 +638,10 @@ glxDRILeaveVT (int index, int flags)
 
     glxSuspendClients();
 
-    return (*screen->leaveVT) (index, flags);
+    scrn->LeaveVT = screen->leaveVT;
+    (*screen->leaveVT) (index, flags);
+    screen->leaveVT = scrn->LeaveVT;
+    scrn->LeaveVT = glxDRILeaveVT;
 }
 
 static void

hw/xfree86/common/xf86VGAarbiter.c

@@ -523,12 +523,16 @@ static Bool
 VGAarbiterEnterVT(int index, int flags)
 {
     Bool val;
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ScreenPtr pScreen = screenInfo.screens[index];
     VGAarbiterScreenPtr pScreenPriv = (VGAarbiterScreenPtr)dixLookupPrivate(
         &pScreen->devPrivates, VGAarbiterScreenKey);
 
     VGAGet();
-    val = (*pScreenPriv->EnterVT)(index, flags);
+    pScrn->EnterVT = pScreenPriv->EnterVT;
+    val = (*pScrn->EnterVT)(index, flags);
+    pScreenPriv->EnterVT = pScrn->EnterVT;
+    pScrn->EnterVT = VGAarbiterEnterVT;
     VGAPut();
     return val;
 }
@@ -536,12 +540,16 @@ VGAarbiterEnterVT(int index, int flags)
 static void
 VGAarbiterLeaveVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ScreenPtr pScreen = screenInfo.screens[index];
     VGAarbiterScreenPtr pScreenPriv = (VGAarbiterScreenPtr)dixLookupPrivate(
         &pScreen->devPrivates, VGAarbiterScreenKey);
 
     VGAGet();
+    pScrn->LeaveVT = pScreenPriv->LeaveVT;
     (*pScreenPriv->LeaveVT)(index, flags);
+    pScreenPriv->LeaveVT = pScrn->LeaveVT;
+    pScrn->LeaveVT = VGAarbiterLeaveVT;
     VGAPut();
 }
 

hw/xfree86/common/xf86cmap.c

@@ -466,11 +466,17 @@ CMapInstallColormap(ColormapPtr pmap)
 static Bool 
 CMapEnterVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ScreenPtr pScreen = screenInfo.screens[index];
+    Bool ret;
     CMapScreenPtr pScreenPriv = (CMapScreenPtr)dixLookupPrivate(
 	&pScreen->devPrivates, CMapScreenKey);
 
-    if((*pScreenPriv->EnterVT)(index, flags)) {
+    pScrn->EnterVT = pScreenPriv->EnterVT;
+    ret = (*pScreenPriv->EnterVT)(index, flags);
+    pScreenPriv->EnterVT = pScrn->EnterVT;
+    pScrn->EnterVT = CMapEnterVT;
+    if(ret) {
 	if(GetInstalledmiColormap(pScreen))
 	    CMapReinstallMap(GetInstalledmiColormap(pScreen));
 	return TRUE;

hw/xfree86/common/xf86xv.c

@@ -1229,11 +1229,15 @@ xf86XVQueryAdaptors(
 static Bool
 xf86XVEnterVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ScreenPtr pScreen = screenInfo.screens[index];
     XF86XVScreenPtr ScreenPriv = GET_XF86XV_SCREEN(pScreen);
     Bool ret;
 
+    pScrn->EnterVT = ScreenPriv->EnterVT;
     ret = (*ScreenPriv->EnterVT)(index, flags);
+    ScreenPriv->EnterVT = pScrn->EnterVT;
+    pScrn->EnterVT = xf86XVEnterVT;
 
     if(ret) WalkTree(pScreen, xf86XVReputAllVideo, 0);
 
@@ -1243,6 +1247,7 @@ xf86XVEnterVT(int index, int flags)
 static void
 xf86XVLeaveVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ScreenPtr pScreen = screenInfo.screens[index];
     XvScreenPtr pxvs = GET_XV_SCREEN(pScreen);
     XF86XVScreenPtr ScreenPriv = GET_XF86XV_SCREEN(pScreen);
@@ -1274,7 +1279,10 @@ xf86XVLeaveVT(int index, int flags)
 	}
     }
 
+    pScrn->LeaveVT = ScreenPriv->LeaveVT;
     (*ScreenPriv->LeaveVT)(index, flags);
+    ScreenPriv->LeaveVT = pScrn->LeaveVT;
+    pScrn->LeaveVT = xf86XVLeaveVT;
 }
 
 static void

hw/xfree86/shadowfb/shadow.c

@@ -216,9 +216,14 @@ static Bool
 ShadowEnterVT(int index, int flags)
 {
     ScrnInfoPtr pScrn = xf86Screens[index];
+    Bool ret;
     ShadowScreenPtr pPriv = GET_SCREEN_PRIVATE(pScrn->pScreen);
 
-    if((*pPriv->EnterVT)(index, flags)) {
+    pScrn->EnterVT = pPriv->EnterVT;
+    ret = (*pPriv->EnterVT)(index, flags);
+    pPriv->EnterVT = pScrn->EnterVT;
+    pScrn->EnterVT = ShadowEnterVT;
+    if(ret) {
 	pPriv->vtSema = TRUE;
         return TRUE;
     }
@@ -229,11 +234,15 @@ ShadowEnterVT(int index, int flags)
 static void
 ShadowLeaveVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ShadowScreenPtr pPriv = GET_SCREEN_PRIVATE(xf86Screens[index]->pScreen);
 
     pPriv->vtSema = FALSE;
 
+    pScrn->LeaveVT = pPriv->LeaveVT;
     (*pPriv->LeaveVT)(index, flags);
+    pPriv->LeaveVT = pScrn->LeaveVT;
+    pScrn->LeaveVT = ShadowLeaveVT;
 }
 
 /**********************************************************/

hw/xfree86/xaa/xaaInit.c

@@ -508,16 +508,23 @@ XAAChangeWindowAttributes (WindowPtr pWin, unsigned long mask)
 static Bool 
 XAAEnterVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
+    Bool ret;
     ScreenPtr pScreen = screenInfo.screens[index];
     XAAScreenPtr pScreenPriv = 
 	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);
 
-    return((*pScreenPriv->EnterVT)(index, flags));
+    pScrn->EnterVT = pScreenPriv->EnterVT;
+    ret = ((*pScreenPriv->EnterVT)(index, flags));
+    pScreenPriv->EnterVT = pScrn->EnterVT;
+    pScrn->EnterVT = XAAEnterVT;
+    return ret;
 }
 
 static void 
 XAALeaveVT(int index, int flags)
 {
+    ScrnInfoPtr pScrn = xf86Screens[index];
     ScreenPtr pScreen = screenInfo.screens[index];
     XAAScreenPtr pScreenPriv = 
 	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);
@@ -528,7 +535,10 @@ XAALeaveVT(int index, int flags)
         infoRec->NeedToSync = FALSE;
     }
 
+    pScrn->LeaveVT = pScreenPriv->LeaveVT;
     (*pScreenPriv->LeaveVT)(index, flags);
+    pScreenPriv->LeaveVT = pScrn->LeaveVT;
+    pScrn->LeaveVT = XAALeaveVT;
 }
 
 typedef struct {