linux-kernel - [PATCH 2/11] ACPI / PM: Call suspend_nvs

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Date:	Thu, 20 Jan 2011 12:28:57 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	Jeff Chua <jeff.chua.linux@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: [PATCH 2/11] ACPI / PM: Call suspend_nvs_free() earlier during resume

From: Rafael J. Wysocki <rjw@...k.pl>

It turns out that some device drivers map pages from the ACPI NVS
region during resume using ioremap(), which conflicts with the
ioremap_cache() used for mapping those pages by the NVS save/restore
code in nvs.c.

Make the NVS pages mapped by the code in nvs.c be unmapped before
device drivers' resume routines run.

Tested-by: Jeff Chua <jeff.chua.linux@...il.com>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/acpi/sleep.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/drivers/acpi/sleep.c
===================================================================
--- linux-2.6.orig/drivers/acpi/sleep.c
+++ linux-2.6/drivers/acpi/sleep.c
@@ -166,6 +166,7 @@ static void acpi_pm_finish(void)
 	u32 acpi_state = acpi_target_sleep_state;
 
 	acpi_ec_unblock_transactions();
+	suspend_nvs_free();
 
 	if (acpi_state == ACPI_STATE_S0)
 		return;
@@ -186,7 +187,6 @@ static void acpi_pm_finish(void)
  */
 static void acpi_pm_end(void)
 {
-	suspend_nvs_free();
 	/*
 	 * This is necessary in case acpi_pm_finish() is not called during a
 	 * failing transition to a sleep state.

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