linux-kernel - Re: [PATCH 1/2] xen/scsiback: correct frontend counting

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Date:	Fri, 5 Feb 2016 16:44:08 +0100
From:	Juergen Gross <jgross@...e.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org,
	konrad.wilk@...cle.com, david.vrabel@...rix.com
Cc:	stable@...r.kernel.org
Subject: Re: [PATCH 1/2] xen/scsiback: correct frontend counting

On 05/02/16 16:42, Boris Ostrovsky wrote:
> 
> 
> On 02/05/2016 08:21 AM, Juergen Gross wrote:
>> When adding a new frontend to xen-scsiback don't decrement the number
>> of active frontends in case of no error. Not doing so results in a
> 
> I think you meant "Doing so".

I think so, too.

> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

Thanks, Juergen

> 
> 
>> failure when trying to remove the xen-pvscsi nexus even if no domain
>> is using it.
>>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> Cc: stable@...r.kernel.org
>> ---
>>   drivers/xen/xen-scsiback.c | 10 +++++-----
>>   1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
>> index ad4eb10..51387d7 100644
>> --- a/drivers/xen/xen-scsiback.c
>> +++ b/drivers/xen/xen-scsiback.c
>> @@ -939,12 +939,12 @@ out:
>>       spin_unlock_irqrestore(&info->v2p_lock, flags);
>>     out_free:
>> -    mutex_lock(&tpg->tv_tpg_mutex);
>> -    tpg->tv_tpg_fe_count--;
>> -    mutex_unlock(&tpg->tv_tpg_mutex);
>> -
>> -    if (err)
>> +    if (err) {
>> +        mutex_lock(&tpg->tv_tpg_mutex);
>> +        tpg->tv_tpg_fe_count--;
>> +        mutex_unlock(&tpg->tv_tpg_mutex);
>>           kfree(new);
>> +    }
>>         return err;
>>   }
> 
>