From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Tue, 23 Jan 2007 22:16:31 +0000 (-0800)
Subject: Clear spurious irq stat information when adding irq handler
X-Git-Tag: firefly_0821_release~31490
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8528b0f1de1101c6002036fd53638fb21111d0ea;p=firefly-linux-kernel-4.4.55.git

Clear spurious irq stat information when adding irq handler

Any newly added irq handler may obviously make any old spurious irq
status invalid, since the new handler may well be the thing that is
supposed to handle any interrupts that came in.

So just clear the statistics when adding handlers.

Pointed-out-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b385878c6e80..8b961adc3bd2 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -315,6 +315,9 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 			/* Undo nested disables: */
 			desc->depth = 1;
 	}
+	/* Reset broken irq detection when installing new handler */
+	desc->irq_count = 0;
+	desc->irqs_unhandled = 0;
 	spin_unlock_irqrestore(&desc->lock, flags);
 
 	new->irq = irq;