* [PATCH] Software Suspend: Fix suspend when console is in VT_AUTO+KD_GRAPHICS mode
@ 2007-03-12 20:29 Andrew Johnson
2007-03-12 20:58 ` Pavel Machek
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Johnson @ 2007-03-12 20:29 UTC (permalink / raw)
To: linux-kernel; +Cc: Pavel Machek, akpm
Hi All,
When the console is in VT_AUTO+KD_GRAPHICS mode, switching to the
SUSPEND_CONSOLE fails, resulting in vt_waitactive() waiting indefinitely
or until the task is interrupted. This patch tests if a console switch
can occur in set_console() and returns early if a console switch is not
possible.
-- Andrew
Signed-off-by: Andrew Johnson <ajohnson@intrinsyc.com>
---
diff -rup linux-2.6.20.1/drivers/char/vt.c linux/drivers/char/vt.c
--- linux-2.6.20.1/drivers/char/vt.c 2007-02-19 22:34:32.000000000 -0800
+++ linux/drivers/char/vt.c 2007-03-12 12:37:44.000000000 -0700
@@ -2188,10 +2188,30 @@ static void console_callback(struct work
release_console_sem();
}
-void set_console(int nr)
+extern char vt_dont_switch;
+
+int set_console(int nr)
{
+ struct vc_data *vc = vc_cons[fg_console].d;
+
+ if (!vc_cons_allocated(nr) || vt_dont_switch ||
+ (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+ /*
+ * Console switch will fail in console_callback() or
+ * change_console() so there is no point scheduling
+ * the callback
+ *
+ * Existing set_console() users don't check the return
+ * value so this shouldn't break anything
+ */
+ return -EINVAL;
+ }
+
want_console = nr;
schedule_console_callback();
+
+ return 0;
}
struct tty_driver *console_driver;
diff -rup linux-2.6.20.1/drivers/char/vt_ioctl.c linux/drivers/char/vt_ioctl.c
--- linux-2.6.20.1/drivers/char/vt_ioctl.c 2007-02-19 22:34:32.000000000 -0800
+++ linux/drivers/char/vt_ioctl.c 2007-03-08 14:15:41.000000000 -0800
@@ -34,7 +34,7 @@
#include <linux/kbd_diacr.h>
#include <linux/selection.h>
-static char vt_dont_switch;
+char vt_dont_switch;
extern struct tty_driver *console_driver;
#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
diff -rup linux-2.6.20.1/include/linux/kbd_kern.h linux/include/linux/kbd_kern.h
--- linux-2.6.20.1/include/linux/kbd_kern.h 2007-02-19 22:34:32.000000000 -0800
+++ linux/include/linux/kbd_kern.h 2007-03-08 14:15:41.000000000 -0800
@@ -75,7 +75,7 @@ extern int do_poke_blanked_console;
extern void (*kbd_ledfunc)(unsigned int led);
-extern void set_console(int nr);
+extern int set_console(int nr);
extern void schedule_console_callback(void);
static inline void set_leds(void)
diff -rup linux-2.6.20.1/kernel/power/console.c linux/kernel/power/console.c
--- linux-2.6.20.1/kernel/power/console.c 2007-02-19 22:34:32.000000000 -0800
+++ linux/kernel/power/console.c 2007-03-09 15:52:32.000000000 -0800
@@ -27,7 +27,15 @@ int pm_prepare_console(void)
return 1;
}
- set_console(SUSPEND_CONSOLE);
+ if (set_console(SUSPEND_CONSOLE)) {
+ /*
+ * We're unable to switch to the SUSPEND_CONSOLE.
+ * Let the calling function know so it can decide
+ * what to do.
+ */
+ release_console_sem();
+ return 1;
+ }
release_console_sem();
if (vt_waitactive(SUSPEND_CONSOLE)) {
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Software Suspend: Fix suspend when console is in VT_AUTO+KD_GRAPHICS mode
2007-03-12 20:29 [PATCH] Software Suspend: Fix suspend when console is in VT_AUTO+KD_GRAPHICS mode Andrew Johnson
@ 2007-03-12 20:58 ` Pavel Machek
0 siblings, 0 replies; 2+ messages in thread
From: Pavel Machek @ 2007-03-12 20:58 UTC (permalink / raw)
To: Andrew Johnson; +Cc: linux-kernel, akpm
Hi!
> When the console is in VT_AUTO+KD_GRAPHICS mode, switching to the
> SUSPEND_CONSOLE fails, resulting in vt_waitactive() waiting indefinitely
> or until the task is interrupted. This patch tests if a console switch
> can occur in set_console() and returns early if a console switch is not
> possible.
> Signed-off-by: Andrew Johnson <ajohnson@intrinsyc.com>
ACK. (I hope it still applies to latest mainline).
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-03-12 20:58 ` Pavel Machek
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