From: Thomas Gleixner <[email protected]>
enable drivers to request an IRQ with a given irq-flow (trigger/polarity)
setting.
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
---
kernel/irq/manage.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
Index: linux-genirq.q/kernel/irq/manage.c
===================================================================
--- linux-genirq.q.orig/kernel/irq/manage.c
+++ linux-genirq.q/kernel/irq/manage.c
@@ -214,8 +214,14 @@ int setup_irq(unsigned int irq, struct i
p = &desc->action;
old = *p;
if (old) {
- /* Can't share interrupts unless both agree to */
- if (!(old->flags & new->flags & SA_SHIRQ))
+ /*
+ * Can't share interrupts unless both agree to and are
+ * the same type (level, edge, polarity). So both flag
+ * fields must have SA_SHIRQ set and the bits which
+ * set the trigger type must match.
+ */
+ if (!((old->flags & new->flags) & SA_SHIRQ) ||
+ ((old->flags ^ new->flags) & SA_TRIGGER_MASK))
goto mismatch;
#if defined(CONFIG_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
@@ -238,6 +244,11 @@ int setup_irq(unsigned int irq, struct i
desc->status |= IRQ_PER_CPU;
#endif
if (!shared) {
+ /* Setup the type (level, edge polarity) if configured: */
+ if (new->flags & SA_TRIGGER_MASK && desc->handler->set_type)
+ desc->handler->set_type(irq,
+ new->flags & SA_TRIGGER_MASK);
+
desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
IRQ_INPROGRESS);
-
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