From: Rafael J. Wysocki <rjw@xxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
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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