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Message-ID: <20080908140824.5ab3c7ca@extreme> Date: Mon, 8 Sep 2008 14:08:24 -0700 From: Stephen Hemminger <shemminger@...tta.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: jbarnes@...tuousgeek.org, bhutchings@...arflare.com, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/3] PCI: vpd handle longer delays in access On Mon, 8 Sep 2008 13:40:25 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote: > On Thu, 04 Sep 2008 13:56:37 -0700 > Stephen Hemminger <shemminger@...tta.com> wrote: > > > Accessing the VPD area can take a long time. The existing > > VPD access code fails consistently on my hardware. There are comments > > in the SysKonnect vendor driver that it can take up to 13ms per word. > > > > Change the access routines to: > > * use a mutex rather than spinning with IRQ's disabled and lock held > > * have a longer timeout > > * call schedule while spinning to provide some responsivness > > It doesn't call schedule() - it calls yield(). > > yield() is pretty notoriously badly behaved in the presence of lots of > runnable tasks and there's been a general move to eradicate its > in-kernel callsites. > > An alternative would be nice. What is a good way to say "i am polling for a while"? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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