linux-kernel - Re: [PATCH] rbd: Fix uninitialized variable use in rbd_acquire

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Date:   Fri, 14 Jul 2017 19:25:37 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Ilya Dryomov <idryomov@...il.com>
CC:     Sage Weil <sage@...hat.com>, Alex Elder <elder@...nel.org>,
        Mike Christie <mchristi@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rbd: Fix uninitialized variable use in rbd_acquire_lock



On 2017/7/14 18:06, Ilya Dryomov wrote:
> On Thu, Jul 13, 2017 at 9:46 AM, Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>> drivers/block/rbd.c: In function 'rbd_acquire_lock':
>> drivers/block/rbd.c:3602:44: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>>
>> Silence the warning, found it when built old kernel(3.10) with
>> OBS(opensuse build service).
>>
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> ---
>>  drivers/block/rbd.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
>> index b008b6a..b640ad8 100644
>> --- a/drivers/block/rbd.c
>> +++ b/drivers/block/rbd.c
>> @@ -3435,7 +3435,7 @@ static void rbd_acquire_lock(struct work_struct *work)
>>         struct rbd_device *rbd_dev = container_of(to_delayed_work(work),
>>                                             struct rbd_device, lock_dwork);
>>         enum rbd_lock_state lock_state;
>> -       int ret;
>> +       int ret = 0;
>>
>>         dout("%s rbd_dev %p\n", __func__, rbd_dev);
>>  again:
> 
> How did you get rbd_acquire_lock() into 3.10?

Using CentOS 7.3.

> 
> Thanks,
> 
>                 Ilya
> 
>