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From 41bdb6c003cca3ef0ff88d9c7de318115bab1ba2 Mon Sep 17 00:00:00 2001
From: Pierre-Loup A. Griffais <pgriffais@nvidia.com>
Date: Wed, 21 Apr 2010 18:11:05 -0700
Subject: [PATCH] xf86: Don't crash when switching modes through RandR without owning the VT.
While VT-switched, FB access is disabled and should remain so. Trying to switch
modes in that state would re-enable it, potentially causing crashes if trying
to access it before the driver has recovered from the mode switch.
Signed-off-by: Pierre-Loup A. Griffais <pgriffais@nvidia.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/xfree86/common/xf86RandR.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/xfree86/common/xf86RandR.c b/hw/xfree86/common/xf86RandR.c
index 02dcc34..d4beb2c 100644
--- a/hw/xfree86/common/xf86RandR.c
+++ b/hw/xfree86/common/xf86RandR.c
@@ -163,7 +163,7 @@ xf86RandRSetMode (ScreenPtr pScreen,
WindowPtr pRoot = WindowTable[pScreen->myNum];
Bool ret = TRUE;
- if (pRoot)
+ if (pRoot && scrp->vtSema)
(*scrp->EnableDisableFBAccess) (pScreen->myNum, FALSE);
if (useVirtual)
{
@@ -229,7 +229,7 @@ xf86RandRSetMode (ScreenPtr pScreen,
*/
xf86SetViewport (pScreen, pScreen->width, pScreen->height);
xf86SetViewport (pScreen, 0, 0);
- if (pRoot)
+ if (pRoot && scrp->vtSema)
(*scrp->EnableDisableFBAccess) (pScreen->myNum, TRUE);
return ret;
}
--
1.7.0.1
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