linux-kernel - Re: [PATCH 1/1] block-rbd: Delete a check before ceph_put_snap

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Message-ID: <CALFYKtDBXh=nEegNtBBbVyKw1ynG2g65CQqqJ1EShfa6ZmoMNw@mail.gmail.com>
Date:	Mon, 1 Dec 2014 14:57:51 +0300
From:	Ilya Dryomov <ilya.dryomov@...tank.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	Alex Elder <elder@...nel.org>, Sage Weil <sage@...tank.com>,
	Yehuda Sadeh <yehuda@...tank.com>,
	Ceph <ceph-devel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/1] block-rbd: Delete a check before ceph_put_snap_context()

On Mon, Dec 1, 2014 at 1:23 PM, SF Markus Elfring
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 1 Dec 2014 11:18:21 +0100
>
> The ceph_put_snap_context() function tests whether its argument is NULL
> and then returns immediately. Thus the test around the call is not needed.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/block/rbd.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
> index 27b71a0..3c34ab5 100644
> --- a/drivers/block/rbd.c
> +++ b/drivers/block/rbd.c
> @@ -3405,8 +3405,7 @@ err_rq:
>         if (result)
>                 rbd_warn(rbd_dev, "%s %llx at %llx result %d",
>                          obj_op_name(op_type), length, offset, result);
> -       if (snapc)
> -               ceph_put_snap_context(snapc);
> +       ceph_put_snap_context(snapc);
>         blk_end_request_all(rq, result);
>  }
>

I squashed it into your "ceph: Deletion of unnecessary checks before two
function calls", which deals with ceph_put_snap_context() in fs/ceph.

Thanks,

                Ilya
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