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authorThomas Gleixner <tglx@linutronix.de>2011-02-10 13:16:14 +0100
committerThomas Gleixner <tglx@linutronix.de>2011-02-19 12:58:22 +0100
commitd4d5e08960844a062da8387ee5f16ca7a33200d0 (patch)
tree1154fd87e25595ae9391740a1d9a3d60f69770de
parent2bff17ad2107c66fc8ca96501a7128dd7fa7a390 (diff)
downloadlinux-d4d5e08960844a062da8387ee5f16ca7a33200d0.tar.gz
genirq: Add IRQCHIP_SET_TYPE_MASKED flag
irq_chips, which require to mask the chip before changing the trigger type should set this flag. So the core takes care of it and the requirement for looking into desc->status in the chip goes away. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Lars-Peter Clausen <lars@metafoo.de>
-rw-r--r--include/linux/irq.h9
-rw-r--r--kernel/irq/chip.c4
-rw-r--r--kernel/irq/internals.h2
-rw-r--r--kernel/irq/manage.c16
4 files changed, 26 insertions, 5 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index aefb30bbcf0e..ef6b66dc9d03 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -308,6 +308,15 @@ struct irq_chip {
#endif
};
+/*
+ * irq_chip specific flags
+ *
+ * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
+ */
+enum {
+ IRQCHIP_SET_TYPE_MASKED = (1 << 0),
+};
+
/* This include will go away once we isolated irq_desc usage to core code */
#include <linux/irqdesc.h>
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 9e9220da4deb..4687457fe7f0 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -367,7 +367,7 @@ static inline void mask_ack_irq(struct irq_desc *desc)
irq_state_set_masked(desc);
}
-static inline void mask_irq(struct irq_desc *desc)
+void mask_irq(struct irq_desc *desc)
{
if (desc->irq_data.chip->irq_mask) {
desc->irq_data.chip->irq_mask(&desc->irq_data);
@@ -375,7 +375,7 @@ static inline void mask_irq(struct irq_desc *desc)
}
}
-static inline void unmask_irq(struct irq_desc *desc)
+void unmask_irq(struct irq_desc *desc)
{
if (desc->irq_data.chip->irq_unmask) {
desc->irq_data.chip->irq_unmask(&desc->irq_data);
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 6776453c454c..1d500fbde0d4 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -84,6 +84,8 @@ extern int irq_startup(struct irq_desc *desc);
extern void irq_shutdown(struct irq_desc *desc);
extern void irq_enable(struct irq_desc *desc);
extern void irq_disable(struct irq_desc *desc);
+extern void mask_irq(struct irq_desc *desc);
+extern void unmask_irq(struct irq_desc *desc);
extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b5de828e58d9..50809c79c7ad 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -554,8 +554,8 @@ void compat_irq_chip_set_default_handler(struct irq_desc *desc)
int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
unsigned long flags)
{
- int ret;
struct irq_chip *chip = desc->irq_data.chip;
+ int ret, unmask = 0;
if (!chip || !chip->irq_set_type) {
/*
@@ -568,6 +568,14 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
}
flags &= IRQ_TYPE_SENSE_MASK;
+
+ if (chip->flags & IRQCHIP_SET_TYPE_MASKED) {
+ if (!(desc->istate & IRQS_MASKED))
+ mask_irq(desc);
+ if (!(desc->istate & IRQS_DISABLED))
+ unmask = 1;
+ }
+
/* caller masked out all except trigger mode flags */
ret = chip->irq_set_type(&desc->irq_data, flags);
@@ -588,11 +596,13 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
if (chip != desc->irq_data.chip)
irq_chip_set_defaults(desc->irq_data.chip);
- return 0;
+ ret = 0;
default:
pr_err("setting trigger mode %lu for irq %u failed (%pF)\n",
flags, irq, chip->irq_set_type);
}
+ if (unmask)
+ unmask_irq(desc);
return ret;
}
@@ -669,7 +679,7 @@ again:
#ifdef CONFIG_SMP
/*
- * Check whether we need to change the affinity of the interrupt thread.
+ * Check whether we need to chasnge the affinity of the interrupt thread.
*/
static void
irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)