x86: Preserve lazy irq disable semantics in fixup_irqs()

The default irq_disable() sematics are to mark the interrupt disabled,
but keep it unmasked. If the interrupt is delivered while marked
disabled, the low level interrupt handler masks it and marks it
pending. This is important for detecting wakeup interrupts during
suspend and for edge type interrupts to avoid losing interrupts.

fixup_irqs() moves the interrupts away from an offlined cpu. For
certain interrupt types it needs to mask the interrupt line before
changing the affinity. After affinity has changed the interrupt line
is unmasked again, but only if it is not marked disabled.

This breaks the lazy irq disable semantics and causes problems in
suspend as the interrupt can be lost or wakeup functionality is
broken.

Check irqd_irq_masked() instead of irqd_irq_disabled() because
irqd_irq_masked() is only set, when the core code actually masked the
interrupt line. If it's not set, we unmask the interrupt and let the
lazy irq disable logic deal with an eventually incoming interrupt.

[ tglx: Massaged changelog and added a comment ]

Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Link: http://lkml.kernel.org/r/27240C0AC20F114CBF8149A2696CBE4A05DFB3@SHSMSX101.ccr.corp.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 7943e0c21bde4daa742ed209e5121ab697f659e8..3dafc6003b7c4a5c177238f3f21d652cdb20ca30 100644 (file)
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -282,8 +282,13 @@ void fixup_irqs(void)
                else if (!(warned++))
                        set_affinity = 0;
 
+               /*
+                * We unmask if the irq was not marked masked by the
+                * core code. That respects the lazy irq disable
+                * behaviour.
+                */
                if (!irqd_can_move_in_process_context(data) &&
-                   !irqd_irq_disabled(data) && chip->irq_unmask)
+                   !irqd_irq_masked(data) && chip->irq_unmask)
                        chip->irq_unmask(data);
 
                raw_spin_unlock(&desc->lock);