From a6b9e8f1e5d5d0b3b0f121a6f677eeca7aab1950 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Wed, 25 Aug 2010 15:06:38 +0000
Subject: linux: Fix CPU usage bug in console fd flushing

If the vt gets a vhangup from under us, then the tty will appear ready
in select(), but trying to tcflush() it will return -EIO, so we'll spin
around at 100% CPU for no reason.  Notice this condition and unregister
the handler if it happens.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
diff --git a/hw/xfree86/os-support/linux/lnx_init.c b/hw/xfree86/os-support/linux/lnx_init.c
index bf61ceb..7ee9046 100644
--- a/hw/xfree86/os-support/linux/lnx_init.c
+++ b/hw/xfree86/os-support/linux/lnx_init.c
@@ -85,7 +85,11 @@ static void *console_handler;
 static void
 drain_console(int fd, void *closure)
 {
-    tcflush(fd, TCIOFLUSH);
+    errno = 0;
+    if (tcflush(fd, TCIOFLUSH) == -1 && errno == EIO) {
+	xf86RemoveGeneralHandler(console_handler);
+	console_handler = NULL;
+    }
 }
 
 void
--
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