linux-kernel - [PATCH 3.12 121/122] ACPI: Fix bug when ACPI reset register is implemented in system memory

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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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