Track which IRQs have been served at each level to make sure that no IRQ
is served more than once while other IRQs at the same level are pending.
Signed-off-by: Max Filippov <[email protected]>
---
arch/xtensa/kernel/traps.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index efc3a29cde80..874b6efc6fb3 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -268,6 +268,7 @@ void do_interrupt(struct pt_regs *regs)
XCHAL_INTLEVEL7_MASK,
};
struct pt_regs *old_regs;
+ unsigned unhandled = ~0u;
trace_hardirqs_off();
@@ -283,6 +284,10 @@ void do_interrupt(struct pt_regs *regs)
for (level = LOCKLEVEL; level > 0; --level) {
if (int_at_level & int_level_mask[level]) {
int_at_level &= int_level_mask[level];
+ if (int_at_level & unhandled)
+ int_at_level &= unhandled;
+ else
+ unhandled |= int_level_mask[level];
break;
}
}
@@ -290,6 +295,8 @@ void do_interrupt(struct pt_regs *regs)
if (level == 0)
break;
+ /* clear lowest pending irq in the unhandled mask */
+ unhandled ^= (int_at_level & -int_at_level);
do_IRQ(__ffs(int_at_level), regs);
}
--
2.20.1