Messages in this thread Patch in this message |  | | | From | "Rafael J. Wysocki" <> | | Subject | [PATCH -mm 2/3] pm: check console before suspending devices | | Date | Sun, 19 Mar 2006 12:05:31 +0100 |
From: "Rafael J. Wysocki" <rjw@sisk.pl>
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> --- drivers/base/power/suspend.c | 5 ++++- drivers/char/vt.c | 8 ++++++++ include/linux/vt_kern.h | 5 +++++ 3 files changed, 17 insertions(+), 1 deletion(-) Index: linux-2.6.16-rc6-mm2/drivers/base/power/suspend.c =================================================================== --- linux-2.6.16-rc6-mm2.orig/drivers/base/power/suspend.c +++ linux-2.6.16-rc6-mm2/drivers/base/power/suspend.c @@ -8,6 +8,7 @@ * */ +#include <linux/vt_kern.h> #include <linux/device.h> #include <linux/kallsyms.h> #include <linux/pm.h> @@ -65,7 +66,6 @@ int suspend_device(struct device * dev, return error; } - /** * device_suspend - Save state and stop all devices in system. * @state: Power state to put each device in. @@ -85,6 +85,9 @@ 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) { Index: linux-2.6.16-rc6-mm2/drivers/char/vt.c =================================================================== --- linux-2.6.16-rc6-mm2.orig/drivers/char/vt.c +++ linux-2.6.16-rc6-mm2/drivers/char/vt.c @@ -3234,6 +3234,14 @@ void vcs_scr_writew(struct vc_data *vc, } } +/* It is unsafe to suspend devices while X has control of the + * hardware. Check if we are running on a kernel-controlled console. + */ +int is_console_suspend_safe(void) +{ + return vc_cons[fg_console].d->vc_mode == KD_TEXT; +} + /* * Visible symbols for modules */ Index: linux-2.6.16-rc6-mm2/include/linux/vt_kern.h =================================================================== --- linux-2.6.16-rc6-mm2.orig/include/linux/vt_kern.h +++ linux-2.6.16-rc6-mm2/include/linux/vt_kern.h @@ -73,6 +73,11 @@ int con_copy_unimap(struct vc_data *dst_ 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |