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Message-ID: <1303116687.5997.109.camel@zakaz.uk.xensource.com>
Date: Mon, 18 Apr 2011 09:51:27 +0100
From: Ian Campbell <ijc@...lion.org.uk>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: LKML <linux-kernel@...r.kernel.org>, Greg KH <gregkh@...e.de>,
Kay Sievers <kay.sievers@...e.de>,
Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
Russell King <linux@....linux.org.uk>,
linux-omap@...r.kernel.org, Kevin Hilman <khilman@...com>,
linux-arm-kernel@...ts.infradead.org,
Ben Dooks <ben-linux@...ff.org>,
Mike Frysinger <vapier@...too.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>,
Guan Xuetao <gxt@...c.pku.edu.cn>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org, Jiri Kosina <jkosina@...e.cz>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 2/14] PM: Add missing syscore_suspend() and
syscore_resume() calls
On Sun, 2011-04-17 at 23:06 +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Device suspend/resume infrastructure is used not only by the suspend
> and hibernate code in kernel/power, but also by , APM, Xen and the
> kexec jump feature. However, commit 40dc166cb5dddbd36aa4ad11c03915ea
> (PM / Core: Introduce struct syscore_ops for core subsystems PM)
> failed to add syscore_suspend() and syscore_resume() calls to that
> code, which generally leads to breakage when the features in question
> are used.
>
> To fix this problem, add the missing syscore_suspend() and
> syscore_resume() calls to arch/x86/kernel/apm_32.c, kernel/kexec.c
> and drivers/xen/manage.c.
Xen bit looks ok to me:
Acked-by: Ian Campbell <ian.campbell@...rix.com>
>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
> arch/x86/kernel/apm_32.c | 5 +++++
> drivers/xen/manage.c | 9 ++++++++-
> kernel/kexec.c | 7 +++++++
> 3 files changed, 20 insertions(+), 1 deletion(-)
>
> Index: linux-2.6/kernel/kexec.c
> ===================================================================
> --- linux-2.6.orig/kernel/kexec.c
> +++ linux-2.6/kernel/kexec.c
> @@ -33,6 +33,7 @@
> #include <linux/vmalloc.h>
> #include <linux/swap.h>
> #include <linux/kmsg_dump.h>
> +#include <linux/syscore_ops.h>
>
> #include <asm/page.h>
> #include <asm/uaccess.h>
> @@ -1532,6 +1533,11 @@ int kernel_kexec(void)
> local_irq_disable();
> /* Suspend system devices */
> error = sysdev_suspend(PMSG_FREEZE);
> + if (!error) {
> + error = syscore_suspend();
> + if (error)
> + sysdev_resume();
> + }
> if (error)
> goto Enable_irqs;
> } else
> @@ -1546,6 +1552,7 @@ int kernel_kexec(void)
>
> #ifdef CONFIG_KEXEC_JUMP
> if (kexec_image->preserve_context) {
> + syscore_resume();
> sysdev_resume();
> Enable_irqs:
> local_irq_enable();
> Index: linux-2.6/drivers/xen/manage.c
> ===================================================================
> --- linux-2.6.orig/drivers/xen/manage.c
> +++ linux-2.6/drivers/xen/manage.c
> @@ -8,6 +8,7 @@
> #include <linux/sysrq.h>
> #include <linux/stop_machine.h>
> #include <linux/freezer.h>
> +#include <linux/syscore_ops.h>
>
> #include <xen/xen.h>
> #include <xen/xenbus.h>
> @@ -70,8 +71,13 @@ static int xen_suspend(void *data)
> BUG_ON(!irqs_disabled());
>
> err = sysdev_suspend(PMSG_FREEZE);
> + if (!err) {
> + err = syscore_suspend();
> + if (err)
> + sysdev_resume();
> + }
> if (err) {
> - printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
> + printk(KERN_ERR "xen_suspend: system core suspend failed: %d\n",
> err);
> return err;
> }
> @@ -95,6 +101,7 @@ static int xen_suspend(void *data)
> xen_timer_resume();
> }
>
> + syscore_resume();
> sysdev_resume();
>
> return 0;
> Index: linux-2.6/arch/x86/kernel/apm_32.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apm_32.c
> +++ linux-2.6/arch/x86/kernel/apm_32.c
> @@ -228,6 +228,7 @@
> #include <linux/kthread.h>
> #include <linux/jiffies.h>
> #include <linux/acpi.h>
> +#include <linux/syscore_ops.h>
>
> #include <asm/system.h>
> #include <asm/uaccess.h>
> @@ -1238,6 +1239,7 @@ static int suspend(int vetoable)
>
> local_irq_disable();
> sysdev_suspend(PMSG_SUSPEND);
> + syscore_suspend();
>
> local_irq_enable();
>
> @@ -1255,6 +1257,7 @@ static int suspend(int vetoable)
> apm_error("suspend", err);
> err = (err == APM_SUCCESS) ? 0 : -EIO;
>
> + syscore_resume();
> sysdev_resume();
> local_irq_enable();
>
> @@ -1280,6 +1283,7 @@ static void standby(void)
>
> local_irq_disable();
> sysdev_suspend(PMSG_SUSPEND);
> + syscore_suspend();
> local_irq_enable();
>
> err = set_system_power_state(APM_STATE_STANDBY);
> @@ -1287,6 +1291,7 @@ static void standby(void)
> apm_error("standby", err);
>
> local_irq_disable();
> + syscore_resume();
> sysdev_resume();
> local_irq_enable();
>
>
> --
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>
--
Ian Campbell
Tact in audacity is knowing how far you can go without going too far.
-- Jean Cocteau
--
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