From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiang Liu Subject: [Patch V4 08/42] x86, ACPI, irq: enhance error handling in function acpi_register_gsi() Date: Mon, 9 Jun 2014 16:19:37 +0800 Message-ID: <1402302011-23642-9-git-send-email-jiang.liu@linux.intel.com> References: <1402302011-23642-1-git-send-email-jiang.liu@linux.intel.com> Return-path: In-Reply-To: <1402302011-23642-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Benjamin Herrenschmidt , Thomas Gleixner , Grant Likely , Ingo Molnar , "H. Peter Anvin" , "Rafael J. Wysocki" , Bjorn Helgaas , Randy Dunlap , Yinghai Lu , Len Brown , Pavel Machek , x86@kernel.org Cc: Jiang Liu , Konrad Rzeszutek Wilk , Andrew Morton , Tony Luck , Joerg Roedel , Paul Gortmaker , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org List-Id: linux-acpi@vger.kernel.org Function mp_register_gsi() may return invalid GSI if error happens, so enhance acpi_register_gsi() to handle possible error cases. Signed-off-by: Jiang Liu --- arch/x86/kernel/acpi/boot.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 392360c607dc..f201579cd0df 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -97,6 +97,8 @@ static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; +#define ACPI_INVALID_GSI INT_MIN + static unsigned int gsi_to_irq(unsigned int gsi) { unsigned int irq = gsi + NR_IRQS_LEGACY; @@ -441,7 +443,7 @@ static int mp_register_gsi(struct device *dev, u32 gsi, int trigger, polarity == ACPI_ACTIVE_HIGH ? 0 : 1); ret = io_apic_set_pci_routing(dev, gsi_to_irq(gsi), &irq_attr); if (ret < 0) - gsi = INT_MIN; + gsi = ACPI_INVALID_GSI; return gsi; } @@ -666,13 +668,13 @@ int (*acpi_suspend_lowlevel)(void); */ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity) { - unsigned int irq; unsigned int plat_gsi = gsi; plat_gsi = (*__acpi_register_gsi)(dev, gsi, trigger, polarity); - irq = gsi_to_irq(plat_gsi); + if (plat_gsi != ACPI_INVALID_GSI) + return gsi_to_irq(plat_gsi); - return irq; + return -1; } EXPORT_SYMBOL_GPL(acpi_register_gsi); -- 1.7.10.4