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Commit ed746e3b authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Linus Torvalds
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[PATCH] swsusp: Change code ordering in disk.c 

Change the ordering of code in kernel/power/disk.c so that device_suspend() is
called before disable_nonboot_cpus() and platform_finish() is called after
enable_nonboot_cpus() and before device_resume(), as indicated by the recent
discussion on Linux-PM (cf.
http://lists.osdl.org/pipermail/linux-pm/2006-November/004164.html

).

The changes here only affect the built-in swsusp.

[alexey.y.starikovskiy@linux.intel.com: fix LED blinking during image load]
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Cc: Greg KH <greg@kroah.com>
Cc: Nigel Cunningham <nigel@suspend2.net>
Cc: Patrick Mochel <mochel@digitalimplant.org>
Cc: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e3c7db62

kernel/cpu.c

+2 −0
Original line number Diff line number Diff line
@@ -309,6 +309,8 @@ void enable_nonboot_cpus(void) 
	mutex_lock(&cpu_add_remove_lock);

	cpu_hotplug_disabled = 0;

	mutex_unlock(&cpu_add_remove_lock);

	if (cpus_empty(frozen_cpus))

		return;



	printk("Enabling non-boot CPUs ...\n");

	for_each_cpu_mask(cpu, frozen_cpus) {

kernel/power/disk.c

+58 −57
Original line number Diff line number Diff line
@@ -87,52 +87,24 @@ static inline void platform_finish(void) 
	}

}



static void unprepare_processes(void)

{

	thaw_processes();

	pm_restore_console();

}



static int prepare_processes(void)

{

	int error = 0;



	pm_prepare_console();



	error = disable_nonboot_cpus();

	if (error)

		goto enable_cpus;



	if (freeze_processes()) {

		error = -EBUSY;

		goto thaw;

	}



	if (pm_disk_mode == PM_DISK_TESTPROC) {

		printk("swsusp debug: Waiting for 5 seconds.\n");

		mdelay(5000);

		goto thaw;

		unprepare_processes();

	}



	error = platform_prepare();

	if (error)

		goto thaw;



	/* Free memory before shutting down devices. */

	if (!(error = swsusp_shrink_memory()))

		return 0;



	platform_finish();

 thaw:

	thaw_processes();

 enable_cpus:

	enable_nonboot_cpus();

	pm_restore_console();

	return error;

}



static void unprepare_processes(void)

{

	platform_finish();

	thaw_processes();

	enable_nonboot_cpus();

	pm_restore_console();

}



/**

 *	pm_suspend_disk - The granpappy of hibernation power management.

 *
@@ -150,29 +122,45 @@ int pm_suspend_disk(void) 
	if (error)

		return error;



	if (pm_disk_mode == PM_DISK_TESTPROC)

		return 0;

	if (pm_disk_mode == PM_DISK_TESTPROC) {

		printk("swsusp debug: Waiting for 5 seconds.\n");

		mdelay(5000);

		goto Thaw;

	}

	/* Free memory before shutting down devices. */

	error = swsusp_shrink_memory();

	if (error)

		goto Thaw;



	error = platform_prepare();

	if (error)

		goto Thaw;



	suspend_console();

	error = device_suspend(PMSG_FREEZE);

	if (error) {

		resume_console();

		printk("Some devices failed to suspend\n");

		goto Thaw;

		printk(KERN_ERR "PM: Some devices failed to suspend\n");

		goto Resume_devices;

	}

	error = disable_nonboot_cpus();

	if (error)

		goto Enable_cpus;



	if (pm_disk_mode == PM_DISK_TEST) {

		printk("swsusp debug: Waiting for 5 seconds.\n");

		mdelay(5000);

		goto Done;

		goto Enable_cpus;

	}



	pr_debug("PM: snapshotting memory.\n");

	in_suspend = 1;

	if ((error = swsusp_suspend()))

		goto Done;

	error = swsusp_suspend();

	if (error)

		goto Enable_cpus;



	if (in_suspend) {

		enable_nonboot_cpus();

		platform_finish();

		device_resume();

		resume_console();

		pr_debug("PM: writing image.\n");
@@ -188,7 +176,10 @@ int pm_suspend_disk(void) 
	}



	swsusp_free();

 Done:

 Enable_cpus:

	enable_nonboot_cpus();

 Resume_devices:

	platform_finish();

	device_resume();

	resume_console();

 Thaw:
@@ -237,41 +228,51 @@ static int software_resume(void) 


	pr_debug("PM: Checking swsusp image.\n");



	if ((error = swsusp_check()))

	error = swsusp_check();

	if (error)

		goto Done;



	pr_debug("PM: Preparing processes for restore.\n");



	if ((error = prepare_processes())) {

	error = prepare_processes();

	if (error) {

		swsusp_close();

		goto Done;

	}



	pr_debug("PM: Reading swsusp image.\n");



	if ((error = swsusp_read())) {

	error = platform_prepare();

	if (error) {

		swsusp_free();

		goto Thaw;

	}



	pr_debug("PM: Preparing devices for restore.\n");

	pr_debug("PM: Reading swsusp image.\n");



	suspend_console();

	if ((error = device_suspend(PMSG_PRETHAW))) {

		resume_console();

		printk("Some devices failed to suspend\n");

	error = swsusp_read();

	if (error) {

		swsusp_free();

		goto Thaw;

	}



	mb();

	pr_debug("PM: Preparing devices for restore.\n");



	pr_debug("PM: Restoring saved image.\n");

	suspend_console();

	error = device_suspend(PMSG_PRETHAW);

	if (error)

		goto Free;



	error = disable_nonboot_cpus();

	if (!error)

		swsusp_resume();

	pr_debug("PM: Restore failed, recovering.n");



	enable_nonboot_cpus();

 Free:

	swsusp_free();

	platform_finish();

	device_resume();

	resume_console();

 Thaw:

	printk(KERN_ERR "PM: Restore failed, recovering.\n");

	unprepare_processes();

 Done:

	/* For success case, the suspend path will release the lock */