linux-kernel - Re: [PATCH 4/5] xen-fbfront: handle backend CLOSED without CLOSING

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Date:	Tue, 23 Oct 2012 04:50:44 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	David Vrabel <david.vrabel@...rix.com>, xen-devel@...ts.xen.org,
	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 4/5] xen-fbfront: handle backend CLOSED without CLOSING

Hi Konrad,

On 10/19/2012 01:00 PM, Konrad Rzeszutek Wilk wrote:
> On Thu, Oct 18, 2012 at 11:03:37AM +0100, David Vrabel wrote:
>> From: David Vrabel <david.vrabel@...rix.com>
>>
>> Backend drivers shouldn't transistion to CLOSED unless the frontend is
>> CLOSED.  If a backend does transition to CLOSED too soon then the
>> frontend may not see the CLOSING state and will not properly shutdown.
>>
>> So, treat an unexpected backend CLOSED state the same as CLOSING.
>>
>> Signed-off-by: David Vrabel <david.vrabel@...rix.com>
>> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>> ---
>> Cc: linux-fbdev@...r.kernel.org
>> Cc: Florian Tobias Schandinat <FlorianSchandinat@....de>
> 
> Hey Florian,
> 
> Should I prep a git pull for you with this or would it be OK
> if I just have your Ack to put this in my git pull for Linus?

Feel free to take it and add
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@....de>


Best regards,

Florian Tobias Schandinat

> 
> Thanks!
>> ---
>>  drivers/video/xen-fbfront.c |    5 ++++-
>>  1 files changed, 4 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
>> index b7f5173..917bb56 100644
>> --- a/drivers/video/xen-fbfront.c
>> +++ b/drivers/video/xen-fbfront.c
>> @@ -641,7 +641,6 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
>>  	case XenbusStateReconfiguring:
>>  	case XenbusStateReconfigured:
>>  	case XenbusStateUnknown:
>> -	case XenbusStateClosed:
>>  		break;
>>  
>>  	case XenbusStateInitWait:
>> @@ -670,6 +669,10 @@ InitWait:
>>  		info->feature_resize = val;
>>  		break;
>>  
>> +	case XenbusStateClosed:
>> +		if (dev->state == XenbusStateClosed)
>> +			break;
>> +		/* Missed the backend's CLOSING state -- fallthrough */
>>  	case XenbusStateClosing:
>>  		xenbus_frontend_closed(dev);
>>  		break;
>> -- 
>> 1.7.2.5
> 

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