linux-kernel - Re: kmemleak report after 9082e87bfbf8 ("block: remove struct bio

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Date:	Tue, 7 Jun 2016 16:43:51 +0100
From:	David Drysdale <drysdale@...gle.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Shaun Tancheff <shaun.tancheff@...gate.com>,
	Christoph Hellwig <hch@....de>, linux-block@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...com>,
	bart.vanassche@...disk.com
Subject: Re: kmemleak report after 9082e87bfbf8 ("block: remove struct bio_batch")

On Tue, Jun 7, 2016 at 3:18 PM, Larry Finger <Larry.Finger@...inger.net> wrote:
> On 06/07/2016 04:39 AM, Catalin Marinas wrote:
>>
>> On Mon, Jun 06, 2016 at 12:09:49PM -0500, Shaun Tancheff wrote:
>>>
>>> I'm pretty sure it is missing a bio_put() after submit_bio_wait().
>>>
>>> Please excuse the hack-y patch but I think you need to do something
>>> like this ...
>>> (Note tabs eaten by gmail).
>>>
>>> diff --git a/block/blk-lib.c b/block/blk-lib.c
>>> index 23d7f30..9e29dc3 100644
>>> --- a/block/blk-lib.c
>>> +++ b/block/blk-lib.c
>>> @@ -113,6 +113,7 @@ int blkdev_issue_discard(struct block_device
>>> *bdev, sector_t sector,
>>>                  ret = submit_bio_wait(type, bio);
>>>                  if (ret == -EOPNOTSUPP)
>>>                          ret = 0;
>>> +               bio_put(bio);
>>>          }
>>>          blk_finish_plug(&plug);
>>>
>>> @@ -165,8 +166,10 @@ int blkdev_issue_write_same(struct block_device
>>> *bdev, sector_t sector,
>>>                  }
>>>          }
>>>
>>> -       if (bio)
>>> +       if (bio) {
>>>                  ret = submit_bio_wait(REQ_WRITE | REQ_WRITE_SAME, bio);
>>> +               bio_put(bio);
>>> +       }
>>>          return ret != -EOPNOTSUPP ? ret : 0;
>>>   }
>>>   EXPORT_SYMBOL(blkdev_issue_write_same);
>>> @@ -206,8 +209,11 @@ static int __blkdev_issue_zeroout(struct
>>> block_device *bdev, sector_t sector,
>>>                  }
>>>          }
>>>
>>> -       if (bio)
>>> -               return submit_bio_wait(WRITE, bio);
>>> +       if (bio) {
>>> +               ret = submit_bio_wait(WRITE, bio);
>>> +               bio_put(bio);
>>> +               return ret;
>>> +       }
>>>          return 0;
>>>   }
>>
>>
>> This patch appears to fix the memory leak on my machine.
>>
>> Tested-by: Catalin Marinas <catalin.marinas@....com>
>
>
> The patch appears to work here as well.
>
> Tested-by: Larry Finger@...inger.net
>
> Thanks,
>
> Larry
>

Works for me too.

Tested-by: David Drysdale <drysdale@...gle.com>