netdev - Re: [E1000-devel] [PATCH] e1000e: test MSI interrupts

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Date:	Wed, 26 Mar 2008 13:42:50 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [E1000-devel] [PATCH] e1000e: test MSI interrupts

Jeff Garzik wrote:
> Auke Kok wrote:
>> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
>>
>> Test the MSI interrupt physically once before assuming that it
>> actually works. Several platforms have already come across that
>> have non-functional MSI interrupts and this code will attempt
>> to detect those safely. Once the test succeeds MSI interrupts
>> will be enabled.
>>
>> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
>> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
>> ---
>>
>>  drivers/net/e1000e/defines.h |    1 
>>  drivers/net/e1000e/e1000.h   |    1 
>>  drivers/net/e1000e/netdev.c  |  161 ++++++++++++++++++++++++++++++++++++++++--
>>  3 files changed, 155 insertions(+), 8 deletions(-)
> 
> Ah, the perennial add-same-test-to-every-driver conundrum.
> 
> I think we are far enough along with MSI to _not_ do this anymore in 
> drivers.
> 
> The platforms with MSI problems should be discovered, made public, and 
> worked around.
> 
> Otherwise you hide the same problem, just for someone else to discover 
> with another component of the machine.

ok, that's reasonable as I have not recently seen any "new" reports against the
current trees.

We have to keep this patch in our out-of-tree version around though, since a lot
of distros still ship kernels without all the new MSI quirks. But that's not for
this forum.

Thanks,

Auke

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