Messages in this thread | | | Date | Mon, 20 Feb 2006 11:38:55 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH -mm] swsusp/pm: refuse to suspend devices if wrong console is active |
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On Ne 19-02-06 21:35:26, Andrew Morton wrote: > "Rafael J. Wysocki" <rjw@sisk.pl> wrote: > > > > 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. > > > > ... > > @@ -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); > > Does this mean that swsusp simply won't work if invoked while X is running > and being displayed? If so, that sounds like a pretty severe limitation.
No, no. Kernel with switch to text console before doing this in swsusp case, and userspace has to switch to text console before doing this in uswsusp case.
This is just a sanity check, to guard against misuse by uswsusp program.
Pavel -- Web maintainer for suspend.sf.net (www.sf.net/projects/suspend) wanted... - 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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