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authorEric W. Biederman <ebiederm@xmission.com>2007-01-28 12:52:03 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-07 15:50:08 -0800
commit5b912c108c8b1fcecbfe13d6d9a183db97b682d3 (patch)
tree0267f65fd9237a41207e4359e09d09e60f6cd754 /kernel/irq
parent1c659d61cfbd8dc3926688c1bbf12d80f4cfb5c2 (diff)
msi: Kill the msi_desc array.
We need to be able to get from an irq number to a struct msi_desc. The msi_desc array in msi.c had several short comings the big one was that it could not be used outside of msi.c. Using irq_data in struct irq_desc almost worked except on some architectures irq_data needs to be used for something else. So this patch adds a msi_desc pointer to irq_desc, adds the appropriate wrappers and changes all of the msi code to use them. The dynamic_irq_init/cleanup code was tweaked to ensure the new field is left in a well defined state. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/chip.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index d27b2585574..475e8a71bcd 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -39,6 +39,7 @@ void dynamic_irq_init(unsigned int irq)
desc->chip = &no_irq_chip;
desc->handle_irq = handle_bad_irq;
desc->depth = 1;
+ desc->msi_desc = NULL;
desc->handler_data = NULL;
desc->chip_data = NULL;
desc->action = NULL;
@@ -74,6 +75,9 @@ void dynamic_irq_cleanup(unsigned int irq)
WARN_ON(1);
return;
}
+ desc->msi_desc = NULL;
+ desc->handler_data = NULL;
+ desc->chip_data = NULL;
desc->handle_irq = handle_bad_irq;
desc->chip = &no_irq_chip;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -162,6 +166,30 @@ int set_irq_data(unsigned int irq, void *data)
EXPORT_SYMBOL(set_irq_data);
/**
+ * set_irq_data - set irq type data for an irq
+ * @irq: Interrupt number
+ * @data: Pointer to interrupt specific data
+ *
+ * Set the hardware irq controller data for an irq
+ */
+int set_irq_msi(unsigned int irq, struct msi_desc *entry)
+{
+ struct irq_desc *desc;
+ unsigned long flags;
+
+ if (irq >= NR_IRQS) {
+ printk(KERN_ERR
+ "Trying to install msi data for IRQ%d\n", irq);
+ return -EINVAL;
+ }
+ desc = irq_desc + irq;
+ spin_lock_irqsave(&desc->lock, flags);
+ desc->msi_desc = entry;
+ spin_unlock_irqrestore(&desc->lock, flags);
+ return 0;
+}
+
+/**
* set_irq_chip_data - set irq chip data for an irq
* @irq: Interrupt number
* @data: Pointer to chip specific data