linux-kernel - Re: New 2.6.24.2 SG

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Message-ID: <47BF4BD0.7080008@cs.wisc.edu>
Date:	Fri, 22 Feb 2008 16:25:20 -0600
From:	Mike Christie <michaelc@...wisc.edu>
To:	markh@...pro.net
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tony Battersby <tonyb@...ernetics.com>
Subject: Re: New 2.6.24.2 SG_IO SCSI problems

Mark Hounschell wrote:
> Mark Hounschell wrote:
>> Mike Christie wrote:
>>> Mike Christie wrote:
>>>> Mark Hounschell wrote:
>>>>> I seem to have run into some sort of regression in the SG_IO
>>>>> interface of 2.6.24.2. I have an application that up until 2.6.24
>>>>> worked fine. The 2.6.23.16 kernel works fine.
>>>>>
>>>>> During reads I get these kernel messages. Writes and other functions
>>>>> _seem_ OK. Actually basic
>>>>> reads  are working. Its with large BC reads using an io_vec list that
>>>>> the problem shows up.
>>>>>
>>>> Are you doing SG_IO to the sg device (/dev/sg*) or to the block device
>>>> (/dev/sdX)?
>>> If you are doing SG_IO to the sg device, then I know of one regression
>>> (well not regression exactly, but I fixed a bug but the patch got
>>> partially overwritten by another patch and that caused a new bug). Both
>>> bugs are fixed in 2.6.25-rc2. Could you try that out if you are doing
>>> SG_IO to the sg device.
>>>
>> Yes, I'm using /dev/sg*. And yes again I'll checkout 2.6.25-rc2 ASIC.
>>
>> Thanks
>> Mark
>> -
>  
> 2.6.25-rc2 does fix the problem I'm having. I don't suppose there is a patch
> lying around for 2.6.24.2??
> 

I attached a backport of the patch from Tony (added as cc) that is in 
2.6.25-rc2. Could you try it out against 2.6.24.2 just to make sure it 
was this patch, then we can send it to stable.

View attachment "fix-passthrough-bufflen.patch" of type "text/x-patch" (1444 bytes)