linux-kernel - Re: [PATCH] please include in 2.6.18: e100 disable device on PCI error

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Date:	Mon, 18 Sep 2006 13:52:02 -0700
From:	Auke Kok <auke-jan.h.kok@...el.com>
To:	Andrew Morton <akpm@...l.org>
CC:	Linas Vepstas <linas@...tin.ibm.com>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Rajesh Shah <rajesh.shah@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"bibo,mao" <bibo.mao@...el.com>, Auke Kok <sofar@...-projects.org>
Subject: Re: [PATCH] please include in 2.6.18: e100 disable device on PCI
 error

Andrew Morton wrote:
> On Mon, 18 Sep 2006 15:01:22 -0500
> linas@...tin.ibm.com (Linas Vepstas) wrote:
> 
>> Hi,
>>
>> Please apply the following one-liner patch to  
>> what will become the stable 2.6.18.  This patch is 
>> low-risk because it affects only the PCI error 
>> recovery code, which dosn't run on most platforms
>> (in particular, isn't invoked on current x86/ia64).
>>
>> This patch was originally sent on 29 June 2006
>> to fix a bug that showed up in an -mm build.
>> The code from -mm made it into mainline, but 
>> this patch did not, and so we're unhappy. :-(
>>
>> Here's the original patch description:
>>
>> A recent patch in -mm3 titled 
>> gregkh-pci-pci-don-t-enable-device-if-already-enabled.patch
>> causes pci_enable_device() to be a no-op if the kernel thinks
>> that the device is already enabled.  This change breaks the
>> PCI error recovery mechanism in the e100 device driver, since, 
>> after PCI slot reset, the card is no longer enabled. This is 
>> a trivial fix for this problem. Tested.
>>
>> Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
>> Signed-off-by: Andrew Morton <akpm@...l.org>
>> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
>>
>> ----
>>  drivers/net/e100.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> Index: linux-2.6.18-rc7-git1/drivers/net/e100.c
>> ===================================================================
>> --- linux-2.6.18-rc7-git1.orig/drivers/net/e100.c	2006-09-18 14:21:49.000000000 -0500
>> +++ linux-2.6.18-rc7-git1/drivers/net/e100.c	2006-09-18 14:24:50.000000000 -0500
>> @@ -2799,6 +2799,7 @@ static pci_ers_result_t e100_io_error_de
>>  	/* Detach; put netif into state similar to hotplug unplug. */
>>  	netif_poll_enable(netdev);
>>  	netif_device_detach(netdev);
>> +	pci_disable_device(pdev);
>>  
>>  	/* Request a slot reset. */
>>  	return PCI_ERS_RESULT_NEED_RESET;
> 
> hm.  I don't have this patch queued, but I _do_ have an equivalent patch
> for e1000 queued; what's up with that?  Nobody seems to have paid much
> attention to the e1000 fix.
> 
> If we can gather the appropriate acks quickly then I expect we can get both
> of these into 2.6.18.

Ack! for both, of course.

I'm unsure what happened here, as I have this patch in my local tree. I suspect 
that it got merged into jeff's #upstream only somehow.

Auke

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