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    SubjectRe: b44: regression in 2.6.22 (resend)
    Date
    On Monday 28 May 2007, Michael Buesch wrote:
    > Can you also test the following patch?
    > I think there's a bug in b44 that is doesn't properly discard
    > shared IRQs, so it might possibly generate a NAPI storm, dunno.
    > Worth a try.
    >
    > Index: linux-2.6.22-rc3/drivers/net/b44.c
    > ===================================================================
    > --- linux-2.6.22-rc3.orig/drivers/net/b44.c 2007-05-27 23:01:44.000000000
    > +0200 +++ linux-2.6.22-rc3/drivers/net/b44.c 2007-05-28 12:48:27.000000000
    > +0200 @@ -911,6 +911,8 @@ static irqreturn_t b44_interrupt(int irq
    > spin_lock(&bp->lock);
    >
    > istat = br32(bp, B44_ISTAT);
    > + if (istat == 0xFFFFFFFF)
    > + goto out; /* Shared IRQ not for us */
    > imask = br32(bp, B44_IMASK);
    >
    > /* The interrupt mask register controls which interrupt bits
    > @@ -942,6 +944,7 @@ irq_ack:
    > bw32(bp, B44_ISTAT, istat);
    > br32(bp, B44_ISTAT);
    > }
    > +out:
    > spin_unlock(&bp->lock);
    > return IRQ_RETVAL(handled);
    > }

    I did try this patch on a affected kernel, but I didn't notice any big
    difference. Perhaps the kernel is a bit less slow during the test, but It's
    hard to tell.

    Maxi
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