[Patch V4 08/42] x86, ACPI, irq: enhance error handling in function acpi_register_gsi()

Jiang Liu
2014-06-10T06:11:23Z

Function mp_register_gsi() may return error code when failed to look up
or program corresponding IOAPIC pin for GSI, so enhance acpi_register_gsi()
to handle possible error cases.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
Minor changes according to review comments:
1) kill useless assignment to plat_gsi.
2) simplify usage of function pointer
---
arch/x86/kernel/acpi/boot.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 392360c607dc..298f79616f1c 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;
+ unsigned int plat_gsi;

- plat_gsi = (*__acpi_register_gsi)(dev, gsi, trigger, polarity);
- irq = gsi_to_irq(plat_gsi);
+ plat_gsi = __acpi_register_gsi(dev, gsi, trigger, polarity);
+ 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