Commit c7649476 authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

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



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;
	}

	...

Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/ZljAV6HjkPSEhWSw@google.com


Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent a38297e3

include/linux/interrupt.h

+4 −0
Original line number Diff line number Diff line
@@ -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);