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Re: [Qemu-block] [PATCH 1/2] virtio-blk: Remove useless condition around


From: Laszlo Ersek
Subject: Re: [Qemu-block] [PATCH 1/2] virtio-blk: Remove useless condition around g_free()
Date: Tue, 7 Feb 2017 14:48:04 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

On 02/07/17 14:27, Fam Zheng wrote:
> Laszlo spotted and studied this wasteful "if". He pointed out:
> 
> The original virtio_blk_free_request needed an "if" as it accesses one
> field, since 671ec3f05655 ("virtio-blk: Convert VirtIOBlockReq.elem to
> pointer", 2014-06-11); later on in f897bf751fbd ("virtio-blk: embed
> VirtQueueElement in VirtIOBlockReq", 2014-07-09) the field became
> embedded, so the "if" became unnecessary (at which point we were using
> g_slice_free(), but it is the same.
> 
> Now drop it.
> 
> Reported-by: Laszlo Ersek <address@hidden>
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  hw/block/virtio-blk.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> index 702eda8..2858c31 100644
> --- a/hw/block/virtio-blk.c
> +++ b/hw/block/virtio-blk.c
> @@ -42,9 +42,7 @@ static void virtio_blk_init_request(VirtIOBlock *s, 
> VirtQueue *vq,
>  
>  static void virtio_blk_free_request(VirtIOBlockReq *req)
>  {
> -    if (req) {
> -        g_free(req);
> -    }
> +    g_free(req);
>  }
>  
>  static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char 
> status)
> 

Reviewed-by: Laszlo Ersek <address@hidden>

Thanks!
Laszlo



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