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Message-Id: <526d09dfa647cacd71d7271bb30bf058f6cf72a2.1424099974.git.jslaby@suse.cz>
Date: Tue, 17 Feb 2015 12:35:08 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: stable@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Randy Wright <rwright@...com>,
"David E. Box" <david.e.box@...ux.intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 121/122] ACPI: Fix bug when ACPI reset register is implemented in system memory
From: Randy Wright <rwright@...com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit a4714a898e85205e1118ec923cde43d88eb105f6 upstream.
Use acpi_os_map_generic_address to pre-map the reset register if it is
memory mapped, thereby preventing the BUG_ON() in line 1319 of
mm/vmalloc.c from triggering during panic-triggered reboots.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=77131
Signed-off-by: Randy Wright <rwright@...com>
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
[rjw: Changelog, simplified code]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
drivers/acpi/osl.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index d73f85247272..ebe0ea2dff69 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1748,6 +1748,16 @@ acpi_status __init acpi_os_initialize(void)
acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
+ if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
+ /*
+ * Use acpi_os_map_generic_address to pre-map the reset
+ * register if it's in system memory.
+ */
+ int rv;
+
+ rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
+ pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
+ }
return AE_OK;
}
@@ -1776,6 +1786,8 @@ acpi_status acpi_os_terminate(void)
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+ if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
+ acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
destroy_workqueue(kacpid_wq);
destroy_workqueue(kacpi_notify_wq);
--
2.2.2
--
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