If there are devices sharing an interrupt, acpi_register_gsi() could be called multiple times for the same gsi. Currently, it just maps the gsi without checking for a previous mapping. This patch adds a check for an existing mapping and uses that if found.
Cc: Hanjun Guo <[email protected]> Cc: Marc Zyngier <[email protected]> Cc: Lorenzo Pieralisi <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Mark Salter <[email protected]> --- drivers/acpi/gsi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/acpi/gsi.c b/drivers/acpi/gsi.c index 38208f2..5698c4f 100644 --- a/drivers/acpi/gsi.c +++ b/drivers/acpi/gsi.c @@ -76,6 +76,13 @@ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity); /* + * The gsi may be shared with other devices, so check for a + * previous mapping and use that if found. + */ + if (acpi_gsi_to_irq(gsi, &irq) > 0) + return irq; + + /* * There is no way at present to look-up the IRQ domain on ACPI, * hence always create mapping referring to the default domain * by passing NULL as irq_domain parameter -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
