linux-kernel - Re: [PATCH v2] drivers/block/xen-blkback: preq.dev is used without initialized

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Date:	Tue, 05 Mar 2013 08:54:31 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Jan Beulich <JBeulich@...e.com>, roger.pau@...rix.com,
	stefano.stabellini@...citrix.com, dgdegra@...ho.nsa.gov,
	xen-devel <xen-devel@...ts.xen.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drivers/block/xen-blkback: preq.dev is used without
 initialized

于 2013年03月01日 21:43, Konrad Rzeszutek Wilk 写道:
> On Thu, Feb 28, 2013 at 10:34:23AM +0800, Chen Gang wrote:
>>
>>   if call xen_vbd_translate failed, the preq.dev will be not initialized.
>>   so use blkif->vbd.pdevice instead (still better to print relative info).
>>
>> additional information:
>>   before commit 01c681d4c70d64cb72142a2823f27c4146a02e63, the value printed
>>   here was bogus, as it was the guest provided value from req->u.rw.handle
>>   rather than the actual device.
> 
> applied with some changes to the description.
> 

  thanks.

>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> Acked-by: Jan Beulich <JBeulich@...e.com>
>> ---
>>  drivers/block/xen-blkback/blkback.c |    3 ++-
>>  1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
>> index de1f319..6d1cc3d 100644
>> --- a/drivers/block/xen-blkback/blkback.c
>> +++ b/drivers/block/xen-blkback/blkback.c
>> @@ -904,7 +904,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
>>  		pr_debug(DRV_PFX "access denied: %s of [%llu,%llu] on dev=%04x\n",
>>  			 operation == READ ? "read" : "write",
>>  			 preq.sector_number,
>> -			 preq.sector_number + preq.nr_sects, preq.dev);
>> +			 preq.sector_number + preq.nr_sects,
>> +			 blkif->vbd.pdevice);
>>  		goto fail_response;
>>  	}
>>  
>> -- 
>> 1.7.7.6
> 
> 


-- 
Chen Gang

Asianux Corporation
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