-----Original Message-----
From: Greg KH [mailto:greg@kroah.com] 
Sent: Tuesday, January 11, 2011 3:03 PM
To: Lee Howard
Cc: linux-serial@vger.kernel.org
Subject: Re: Mainpine IQ Express Rev3 problems beginning 2.6.36

On Tue, Jan 11, 2011 at 11:16:06AM -0800, Lee Howard wrote:

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-----Original Message-----
From: Greg KH [mailto:greg@kroah.com]
Sent: Monday, January 10, 2011 4:03 PM
To: Lee Howard
Cc: linux-serial@vger.kernel.org
Subject: Re: Mainpine IQ Express Rev3 problems beginning 2.6.36

On Fri, Dec 17, 2010 at 05:25:19AM -0800, Lee Howard wrote:

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-----Original Message-----
From: linux-serial-owner@vger.kernel.org
[mailto:linux-serial-owner@vger.kernel.org] On Behalf Of

Lee Howard

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Sent: Tuesday, December 14, 2010 11:50 AM
To: 'Greg KH'
Cc: linux-serial@vger.kernel.org
Subject: RE: Mainpine IQ Express Rev3 problems 

beginning 2.6.36

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-----Original Message-----
From: Greg KH [mailto:greg@kroah.com]
Sent: Sunday, December 12, 2010 8:52 AM

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As for build issues, try to make a minimal working

config for your

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system, using 'make localmodconfig'.  That will 

speed up your 

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build time immensely as well as reduce your chances of

build and

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runtime problems with the intermediate kernels.

Thank-you, that did help immensely.

Here's the 'git bisect' result...

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7a56aa45982bb87bfca98a2832b5ae782c03364a is the first 

bad commit 

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commit 7a56aa45982bb87bfca98a2832b5ae782c03364a
Author: Yegor Yefremov [off-list ref]
Date:   Wed Jun 16 16:29:55 2010 +0200

    serial: add UART_CAP_EFR and UART_CAP_SLEEP flags 

to 16C950 

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UARTs definition
    
    Adding UART_CAP_EFR and UART_CAP_SLEEP flags will

enable sleep

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mode
    and automatic CTS flow control for 16C950 UARTs. It will 
also avoid
    capabilities detection warning like this:
    
    "ttyS0: detected caps 00000700 should be 00000100"
    
    Signed-off-by: Yegor Yefremov [off-list ref]
    Signed-off-by: Greg Kroah-Hartman [off-list ref]

:040000 040000 1776ca8d5c653834363c0778b5b404ee52bd2d69
b81cfe4f302a674935181bd248641873820517e5 M      drivers
--------------

Indeed, if I remove the UART_CAP_EFR flag from later kernel 
revisions there is no problem.

Greg,

What's to be done?

Sorry for the delay, I think Pavel's posted patch will solve this 
issue for you, right?

I've looked in the linux-serial archives for posts by Pavel for the 
last month, but I don't see a patch.  Please tell me where 

I can find this patch.

I've attached it below.

Thank you.  Sorry for my delay in responding.  Yes, the posted patch will
solve the issue for me.

I was going to look into whether UART_CAP_SLEEP was meaningful without
UART_CAP_EFR because I thought I had read somewhere that it was not.  But I
just haven't managed to make time to do that.

Thanks,

Lee.