From ff4da2e262d2509fe1bacff70dd00934be569c66 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rjw@sisk.pl>
Date: Thu, 23 Mar 2006 03:00:07 -0800
Subject: [PATCH] [PATCH] swsusp: add check for suspension of X-controlled
devices
It is unsafe to suspend devices if the hardware is controlled by X. Add an
extra check to prevent this from happening.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
drivers/base/power/suspend.c | 5 ++++-
drivers/char/vt.c | 8 ++++++++
include/linux/vt_kern.h | 5 +++++
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/base/power/suspend.c b/drivers/base/power/suspend.c
index 8660779fb288b..bdb60663f2eff 100644
--- a/drivers/base/power/suspend.c
+++ b/drivers/base/power/suspend.c
@@ -8,6 +8,7 @@
*
*/
+#include <linux/vt_kern.h>
#include <linux/device.h>
#include "../base.h"
#include "power.h"
@@ -62,7 +63,6 @@ int suspend_device(struct device * dev, pm_message_t state)
return error;
}
-
/**
* device_suspend - Save state and stop all devices in system.
* @state: Power state to put each device in.
@@ -82,6 +82,9 @@ int device_suspend(pm_message_t state)
{
int error = 0;
+ if (!is_console_suspend_safe())
+ return -EINVAL;
+
down(&dpm_sem);
down(&dpm_list_sem);
while (!list_empty(&dpm_active) && error == 0) {
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 0900d1dbee599..86b31b87eb850 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -3234,6 +3234,14 @@ void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
}
}
+int is_console_suspend_safe(void)
+{
+ /* It is unsafe to suspend devices while X has control of the
+ * hardware. Make sure we are running on a kernel-controlled console.
+ */
+ return vc_cons[fg_console].d->vc_mode == KD_TEXT;
+}
+
/*
* Visible symbols for modules
*/
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index fab5aed8ca315..530ae3f4248cc 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -73,6 +73,11 @@ int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc);
int vt_waitactive(int vt);
void change_console(struct vc_data *new_vc);
void reset_vc(struct vc_data *vc);
+#ifdef CONFIG_VT
+int is_console_suspend_safe(void);
+#else
+static inline int is_console_suspend_safe(void) { return 1; }
+#endif
/*
* vc_screen.c shares this temporary buffer with the console write code so that
--
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