[PATCH] linux/interrupt.h: allow "guard" notation to disable and reenable IRQ

[Dmitry Torokhov]

Drivers often need to first disable an interrupt, carry out some
action, and then reenable the interrupt. Introduce support for the
"guard" notation for this so that the following is possible:

	...

	scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
		guard(disable_irq)(&client->irq);

		error = elan_acquire_baseline(data);
		if (error)
			return error;
	}

	...

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
 include/linux/interrupt.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 5c9bdd3ffccc..3a36e64119c8 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -5,6 +5,7 @@
 
 #include <linux/kernel.h>
 #include <linux/bitops.h>
+#include <linux/cleanup.h>
 #include <linux/cpumask.h>
 #include <linux/irqreturn.h>
 #include <linux/irqnr.h>
@@ -235,6 +236,9 @@ extern void enable_percpu_irq(unsigned int irq, unsigned int type);
 extern bool irq_percpu_is_enabled(unsigned int irq);
 extern void irq_wake_thread(unsigned int irq, void *dev_id);
 
+DEFINE_LOCK_GUARD_1(disable_irq, int,
+		    disable_irq(*_T->lock), enable_irq(*_T->lock))
+
 extern void disable_nmi_nosync(unsigned int irq);
 extern void disable_percpu_nmi(unsigned int irq);
 extern void enable_nmi(unsigned int irq);
-- 
2.45.1.288.g0e0cd299f1-goog


-- 
Dmitry