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authorMagnus Damm <damm@igel.co.jp>2009-03-12 21:05:42 +0900
committerIngo Molnar <mingo@elte.hu>2009-03-12 13:16:32 +0100
commitf21cfb258df6dd3ea0b3e56d75c7e994edb81b35 (patch)
tree63d2c11d1857bdffab6bf3ed036af8e03d16abd7 /kernel
parentf8cb22cbb8383c9f41e6ccbcd4fb94edb1048bda (diff)
downloadlinux-f21cfb258df6dd3ea0b3e56d75c7e994edb81b35.tar.bz2
irq: add remove_irq() for freeing of setup_irq() irqs
Impact: add new API This patch adds a remove_irq() function for releasing interrupts requested with setup_irq(). Without this patch we have no way of releasing such interrupts since free_irq() today tries to kfree() the irqaction passed with setup_irq(). Signed-off-by: Magnus Damm <damm@igel.co.jp> LKML-Reference: <20090312120542.2926.56609.sendpatchset@rx1.opensource.se> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/manage.c39
1 files changed, 26 insertions, 13 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 52ee17135092..8b069a7046e9 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -551,20 +551,14 @@ int setup_irq(unsigned int irq, struct irqaction *act)
}
/**
- * free_irq - free an interrupt
+ * remove_irq - free an interrupt
* @irq: Interrupt line to free
* @dev_id: Device identity to free
*
- * Remove an interrupt handler. The handler is removed and if the
- * interrupt line is no longer in use by any driver it is disabled.
- * On a shared IRQ the caller must ensure the interrupt is disabled
- * on the card it drives before calling this function. The function
- * does not return until any executing interrupts for this IRQ
- * have completed.
- *
- * This function must not be called from interrupt context.
+ * Used to remove interrupts statically setup by the early boot process.
*/
-void free_irq(unsigned int irq, void *dev_id)
+
+struct irqaction *remove_irq(unsigned int irq, void *dev_id)
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action, **action_ptr;
@@ -573,7 +567,7 @@ void free_irq(unsigned int irq, void *dev_id)
WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
if (!desc)
- return;
+ return NULL;
spin_lock_irqsave(&desc->lock, flags);
@@ -589,7 +583,7 @@ void free_irq(unsigned int irq, void *dev_id)
WARN(1, "Trying to free already-free IRQ %d\n", irq);
spin_unlock_irqrestore(&desc->lock, flags);
- return;
+ return NULL;
}
if (action->dev_id == dev_id)
@@ -636,7 +630,26 @@ void free_irq(unsigned int irq, void *dev_id)
local_irq_restore(flags);
}
#endif
- kfree(action);
+ return action;
+}
+
+/**
+ * free_irq - free an interrupt allocated with request_irq
+ * @irq: Interrupt line to free
+ * @dev_id: Device identity to free
+ *
+ * Remove an interrupt handler. The handler is removed and if the
+ * interrupt line is no longer in use by any driver it is disabled.
+ * On a shared IRQ the caller must ensure the interrupt is disabled
+ * on the card it drives before calling this function. The function
+ * does not return until any executing interrupts for this IRQ
+ * have completed.
+ *
+ * This function must not be called from interrupt context.
+ */
+void free_irq(unsigned int irq, void *dev_id)
+{
+ kfree(remove_irq(irq, dev_id));
}
EXPORT_SYMBOL(free_irq);