netdev - Re: b44: regression in 2.6.22 (resend)

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Message-ID: <20070529140155.07693380@freepuppy>
Date:	Tue, 29 May 2007 14:01:55 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Michael Buesch <mb@...sch.de>
Cc:	"Gary Zambrano" <zambrano@...adcom.com>,
	"Maximilian Engelhardt" <maxi@...monizer.de>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"linux-wireless" <linux-wireless@...r.kernel.org>,
	"Arnaldo Carvalho de Melo" <acme@...stprotocols.net>,
	"Jeff Garzik" <jgarzik@...ox.com>, netdev@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: b44: regression in 2.6.22 (resend)

I am busy bisecting the real cause. Unfortunately, oprofile doesn't work
on the laptop, and build time sucks...

This how I think the IRQ should work:

--- a/drivers/net/b44.c	2007-05-29 09:47:53.000000000 -0700
+++ b/drivers/net/b44.c	2007-05-29 09:49:50.000000000 -0700
@@ -908,9 +908,11 @@ static irqreturn_t b44_interrupt(int irq
 	u32 istat, imask;
 	int handled = 0;
 
-	spin_lock(&bp->lock);
-
 	istat = br32(bp, B44_ISTAT);
+	if (istat == 0 || istat == ~0)
+		return IRQ_NONE;
+
+	spin_lock(&bp->lock);
 	imask = br32(bp, B44_IMASK);
 
 	/* The interrupt mask register controls which interrupt bits
-
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