Commit-ID: f21cfb258df6dd3ea0b3e56d75c7e994edb81b35
Gitweb: http://git.kernel.org/tip/f21cfb258df6dd3ea0b3e56d75c7e994edb81b35
Author: Magnus Damm <damm@xxxxxxxxxx>
AuthorDate: Thu, 12 Mar 2009 21:05:42 +0900
Commit: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 12 Mar 2009 13:16:32 +0100
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@xxxxxxxxxx>
LKML-Reference: <20090312120542.2926.56609.sendpatchset@xxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
include/linux/irq.h | 1 +
kernel/irq/manage.c | 39 ++++++++++++++++++++++++++-------------
2 files changed, 27 insertions(+), 13 deletions(-)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index f899b50..56f9988 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -236,6 +236,7 @@ typedef struct irq_desc irq_desc_t;
#include <asm/hw_irq.h>
extern int setup_irq(unsigned int irq, struct irqaction *new);
+extern struct irqaction *remove_irq(unsigned int irq, void *dev_id);
#ifdef CONFIG_GENERIC_HARDIRQS
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 52ee171..8b069a7 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);
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|