Fix an issue in plat_irq_dispatch due to which it can call do_IRQ
with a PIC irq that is not mapped.
When a per-cpu interrupt and a PIC interrupt are both active, the
check 'eirr & PERCPU_IRQ_MASK' will be true, but the interrupt in 'i'
will be the number of the PIC interrupt. In this case, we will call
do_IRQ on the PIC interrupt without mapping it with nlm_irq_to_xirq().
Fix this by using __ffs64 instead of __ilog2_u64 and using the
interrupt number instead of mask to identify per-cpu interrupts.
Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx>
---
arch/mips/netlogic/common/irq.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/mips/netlogic/common/irq.c b/arch/mips/netlogic/common/irq.c
index 9f84c60..73facb2 100644
--- a/arch/mips/netlogic/common/irq.c
+++ b/arch/mips/netlogic/common/irq.c
@@ -253,13 +253,12 @@ asmlinkage void plat_irq_dispatch(void)
node = nlm_nodeid();
eirr = read_c0_eirr_and_eimr();
-
- i = __ilog2_u64(eirr);
- if (i == -1)
+ if (eirr == 0)
return;
+ i = __ffs64(eirr);
/* per-CPU IRQs don't need translation */
- if (eirr & PERCPU_IRQ_MASK) {
+ if (i < PIC_IRQ_BASE) {
do_IRQ(i);
return;
}
--
1.7.9.5
