From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiang Liu Subject: [Debug 2/2] x86/PCI/ACPI: Relax ACPI resource descriptor checks to work around BIOS bugs Date: Tue, 3 Mar 2015 12:25:41 +0800 Message-ID: <1425356741-26789-3-git-send-email-jiang.liu@linux.intel.com> References: <1425356741-26789-1-git-send-email-jiang.liu@linux.intel.com> Return-path: In-Reply-To: <1425356741-26789-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: "Rafael J . Wysocki" , Thomas Voegtle , Hudd , Prakash Punnoor , Francois Romieu , Dave Airlie , Marcel Holtmann , Len Brown Cc: Jiang Liu , Bjorn Helgaas , LKML , linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Thomas Gleixner , Lv Zheng List-Id: linux-acpi@vger.kernel.org Some BIOSes report incorrect length for ACPI address space descriptors, so relax the checks to avoid regressions. Signed-off-by: Jiang Liu --- drivers/acpi/resource.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c index c723668e3e27..5589a6e2a023 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -42,8 +42,10 @@ static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io) * CHECKME: len might be required to check versus a minimum * length as well. 1 for io is fine, but for memory it does * not make any sense at all. + * Note: some BIOSes report incorrect length for ACPI address space + * descriptor, so remove check of 'reslen == len' to avoid regression. */ - if (len && reslen && reslen == len && start <= end) + if (len && reslen && start <= end) return true; pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n", -- 1.7.10.4