Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH -mm] swsusp/pm: refuse to suspend devices if wrong console is active | Date | Sun, 19 Feb 2006 23:26:35 +0100 |
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1) Remove the console-switching code from the suspend part of the swsusp userland interface and let the userland tools switch the console.
2) 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> Acked-by: Pavel Machek <pavel@suse.cz> --- drivers/base/power/suspend.c | 9 +++++++++ kernel/power/user.c | 3 --- 2 files changed, 9 insertions(+), 3 deletions(-)
Index: linux-2.6.16-rc3-mm1/kernel/power/user.c =================================================================== --- linux-2.6.16-rc3-mm1.orig/kernel/power/user.c +++ linux-2.6.16-rc3-mm1/kernel/power/user.c @@ -138,12 +138,10 @@ static int snapshot_ioctl(struct inode * if (data->frozen) break; down(&pm_sem); - pm_prepare_console(); disable_nonboot_cpus(); if (freeze_processes()) { thaw_processes(); enable_nonboot_cpus(); - pm_restore_console(); error = -EBUSY; } up(&pm_sem); @@ -157,7 +155,6 @@ static int snapshot_ioctl(struct inode * down(&pm_sem); thaw_processes(); enable_nonboot_cpus(); - pm_restore_console(); up(&pm_sem); data->frozen = 0; break; Index: linux-2.6.16-rc3-mm1/drivers/base/power/suspend.c =================================================================== --- linux-2.6.16-rc3-mm1.orig/drivers/base/power/suspend.c +++ linux-2.6.16-rc3-mm1/drivers/base/power/suspend.c @@ -8,6 +8,9 @@ * */ +#include <linux/vt_kern.h> +#include <linux/kbd_kern.h> +#include <linux/console.h> #include <linux/device.h> #include "../base.h" #include "power.h" @@ -82,6 +85,12 @@ int device_suspend(pm_message_t state) { int error = 0; + /* It is unsafe to suspend devices while X has control of the + * hardware. Make sure we are running on a kernel-controlled console. + */ + if (vc_cons[fg_console].d->vc_mode != KD_TEXT) + return -EINVAL; + down(&dpm_sem); down(&dpm_list_sem); while (!list_empty(&dpm_active) && error == 0) { - 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/
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