From: Matthew Wilcox <matthew@wil.cx>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
linux-pci@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 1/9] PCI: vpd handle longer delays in access (rev3)
Date: Tue, 9 Sep 2008 14:23:09 -0600 [thread overview]
Message-ID: <20080909202309.GE2772@parisc-linux.org> (raw)
In-Reply-To: <20080909182056.936398506@vyatta.com>
On Tue, Sep 09, 2008 at 11:20:41AM -0700, Stephen Hemminger 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 much longer timeout
> * call cond_resched while spinning
> - udelay(10);
> + if (fatal_signal_pending(current))
> + return -EINTR;
> + cond_resched();
We're back to the hammering on the pci bus problem again. However,
cond_resched() does tell us whether we rescheduled!
if (!cond_resched())
udelay(10);
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2008-09-09 20:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-09 18:20 [PATCH 0/9] PCI VPD related patches Stephen Hemminger
2008-09-09 18:20 ` [PATCH 1/9] PCI: vpd handle longer delays in access (rev3) Stephen Hemminger
2008-09-09 20:23 ` Matthew Wilcox [this message]
2008-09-09 18:20 ` [PATCH 2/9] PCI: revise VPD access interface (rev3) Stephen Hemminger
2008-09-09 18:20 ` [PATCH 3/9] PCI: add interface to set visible size of VPD (rev3) Stephen Hemminger
2008-09-09 18:20 ` [PATCH 4/9] sky2: set VPD size Stephen Hemminger
2008-09-09 18:20 ` [PATCH 5/9] sky2: move VPD display into debug interface Stephen Hemminger
2008-09-09 18:20 ` [PATCH 6/9] sky2: remove VPD eeprom Stephen Hemminger
2008-09-09 18:20 ` [PATCH 7/9] skge: set VPD size Stephen Hemminger
2008-09-09 18:20 ` [PATCH 8/9] skge: add VPD display into debug interface Stephen Hemminger
2008-09-09 18:20 ` [PATCH 9/9] skge: remove VPD eeprom Stephen Hemminger
-- strict thread matches above, loose matches on Subject: below --
2008-09-25 16:48 [PATCH 0/9] PCI vpd patches (rev4) Stephen Hemminger
2008-09-25 16:48 ` [PATCH 1/9] PCI: vpd handle longer delays in access (rev3) Stephen Hemminger
2008-09-25 18:54 ` Matthew Wilcox
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