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authorThomas Gleixner <tglx@linutronix.de>2014-02-15 00:55:19 +0000
committerThomas Gleixner <tglx@linutronix.de>2014-02-19 17:22:44 +0100
commita92444c6b2225a9115d661c950cb48a22aeace20 (patch)
treead76dd71c9fec1648469009cb356351ca23daef0 /kernel/irq/handle.c
parent18258f7239a61d8929b8e0c7b6d46c446459074c (diff)
downloadlinux-stericsson-a92444c6b2225a9115d661c950cb48a22aeace20.tar.gz
genirq: Provide irq_wake_thread()
In course of the sdhci/sdio discussion with Russell about killing the sdio kthread hackery we discovered the need to be able to wake an interrupt thread from software. The rationale for this is, that sdio hardware can lack proper interrupt support for certain features. So the driver needs to poll the status registers, but at the same time it needs to be woken up by an hardware interrupt. To be able to get rid of the home brewn kthread construct of sdio we need a way to wake an irq thread independent of an actual hardware interrupt. Provide an irq_wake_thread() function which wakes up the thread which is associated to a given dev_id. This allows sdio to invoke the irq thread from the hardware irq handler via the IRQ_WAKE_THREAD return value and provides a possibility to wake it via a timer for the polling scenarios. That allows to simplify the sdio logic significantly. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Chris Ball <chris@printf.net> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20140215003823.772565780@linutronix.de
Diffstat (limited to 'kernel/irq/handle.c')
-rw-r--r--kernel/irq/handle.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 131ca176b497..bfec453557b4 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -51,7 +51,7 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action)
"but no thread function available.", irq, action->name);
}
-static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action)
+void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action)
{
/*
* In case the thread crashed and was killed we just pretend that
@@ -157,7 +157,7 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
break;
}
- irq_wake_thread(desc, action);
+ __irq_wake_thread(desc, action);
/* Fall through to add to randomness */
case IRQ_HANDLED: