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| author | Max Filippov <jcmvbkbc@gmail.com> | 2017-06-05 11:43:51 +0200 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2017-06-06 01:53:10 +0200 |
| commit | e5c86679d5e864947a52fb31e45a425dea3e7fa9 (patch) | |
| tree | c0eb37a4f2386c131ddb2725f4ac4ae781402473 /drivers/irqchip/irq-xtensa-pic.c | |
| parent | xtensa: reduce double exception literal reservation (diff) | |
| download | linux-e5c86679d5e864947a52fb31e45a425dea3e7fa9.tar.xz linux-e5c86679d5e864947a52fb31e45a425dea3e7fa9.zip | |
xtensa: don't use linux IRQ #0
Linux IRQ #0 is reserved for error reporting and may not be used.
Increase NR_IRQS for one additional slot and increase
irq_domain_add_legacy parameter first_irq value to 1, so that linux
IRQ #0 is not associated with hardware IRQ #0 in legacy IRQ domains.
Introduce macro XTENSA_PIC_LINUX_IRQ for static translation of xtensa
PIC hardware IRQ # to linux IRQ #. Use this macro in XTFPGA platform
data definitions.
This fixes inability to use hardware IRQ #0 in configurations that don't
use device tree and allows for non-identity mapping between linux IRQ #
and hardware IRQ #.
Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'drivers/irqchip/irq-xtensa-pic.c')
| -rw-r--r-- | drivers/irqchip/irq-xtensa-pic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-xtensa-pic.c b/drivers/irqchip/irq-xtensa-pic.c index 472ae1770964..f728755fa292 100644 --- a/drivers/irqchip/irq-xtensa-pic.c +++ b/drivers/irqchip/irq-xtensa-pic.c @@ -89,7 +89,7 @@ static struct irq_chip xtensa_irq_chip = { int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent) { struct irq_domain *root_domain = - irq_domain_add_legacy(NULL, NR_IRQS, 0, 0, + irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0, &xtensa_irq_domain_ops, &xtensa_irq_chip); irq_set_default_host(root_domain); return 0; |