Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933874AbbBQLgs (ORCPT ); Tue, 17 Feb 2015 06:36:48 -0500 Received: from ip4-83-240-67-251.cust.nbox.cz ([83.240.67.251]:39785 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757052AbbBQLfW (ORCPT ); Tue, 17 Feb 2015 06:35:22 -0500 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Randy Wright , "David E. Box" , "Rafael J. Wysocki" , Jiri Slaby Subject: [PATCH 3.12 121/122] ACPI: Fix bug when ACPI reset register is implemented in system memory Date: Tue, 17 Feb 2015 12:35:08 +0100 Message-Id: <526d09dfa647cacd71d7271bb30bf058f6cf72a2.1424099974.git.jslaby@suse.cz> X-Mailer: git-send-email 2.2.2 In-Reply-To: <09e6fe32192a77f6e2e60cc0f4103e630c7ecf20.1424099973.git.jslaby@suse.cz> References: <09e6fe32192a77f6e2e60cc0f4103e630c7ecf20.1424099973.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2198 Lines: 61 From: Randy Wright 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 Signed-off-by: David E. Box [rjw: Changelog, simplified code] Signed-off-by: Rafael J. Wysocki Signed-off-by: Jiri Slaby --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/