From mboxrd@z Thu Jan 1 00:00:00 1970 From: guohanjun@huawei.com (Hanjun Guo) Date: Tue, 17 Jan 2017 20:15:19 +0800 Subject: [PATCH V9 1/3] ACPI: Generic GSI: Do not attempt to map non-GSI IRQs during bus scan In-Reply-To: <1481753438-3905-2-git-send-email-agustinv@codeaurora.org> References: <1481753438-3905-1-git-send-email-agustinv@codeaurora.org> <1481753438-3905-2-git-send-email-agustinv@codeaurora.org> Message-ID: <587E0AD7.40303@huawei.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 2016/12/15 6:10, Agustin Vega-Frias wrote: > ACPI extended IRQ resources may contain a Resource Source field to specify > an alternate interrupt controller, attempting to map them as GSIs is > incorrect, so just disable the platform resource. > > Since this field is currently ignored, we make this change conditional > on CONFIG_ACPI_GENERIC_GSI to keep the current behavior on x86 platforms, > in case some existing ACPI tables are using this incorrectly. > > Signed-off-by: Agustin Vega-Frias > --- > drivers/acpi/resource.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c > index 56241eb..76ca4e9 100644 > --- a/drivers/acpi/resource.c > +++ b/drivers/acpi/resource.c > @@ -43,6 +43,18 @@ static inline bool acpi_iospace_resource_valid(struct resource *res) > acpi_iospace_resource_valid(struct resource *res) { return true; } > #endif > > +#ifdef CONFIG_ACPI_GENERIC_GSI > +static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq) > +{ > + return ext_irq->resource_source.string_length == 0; As pointed out by Lorenzo, if the interrupt resource is a Resource Producer, it's not GSI, so maybe the code needs to be updated as - return ext_irq->resource_source.string_length == 0; + return ext_irq->resource_source.string_length == 0 && + ext_irq->producer_consumer != ACPI_PRODUCER; Thanks Hanjun