Re: [Qemu-devel] [PATCH 2/8] hw/net/cadence_gem: Remove dead code

[Peter Crosthwaite <peter.crosthwaite@xilinx.com>]

On Fri, May 9, 2014 at 4:46 AM, Peter Maydell <peter.maydell@linaro.org> wrote:
> Commit 191946c moved the code to handle padding to minimum
> length from after the handling of the CRC to before it.
> This means that the CRC code doesn't need to cope with the
> possibility that the size is less than 60; remove this
> dead code.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

> ---
>  hw/net/cadence_gem.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
> index cdb1825..afddc8a 100644
> --- a/hw/net/cadence_gem.c
> +++ b/hw/net/cadence_gem.c
> @@ -717,7 +717,6 @@ static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
>          rxbuf_ptr = (void *)buf;
>      } else {
>          unsigned crc_val;
> -        int      crc_offset;
>
>          /* The application wants the FCS field, which QEMU does not provide.
>           * We must try and caclculate one.
> @@ -727,12 +726,7 @@ static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
>          memset(rxbuf + size, 0, sizeof(rxbuf) - size);
>          rxbuf_ptr = rxbuf;
>          crc_val = cpu_to_le32(crc32(0, rxbuf, MAX(size, 60)));
> -        if (size < 60) {
> -            crc_offset = 60;
> -        } else {
> -            crc_offset = size;
> -        }
> -        memcpy(rxbuf + crc_offset, &crc_val, sizeof(crc_val));
> +        memcpy(rxbuf + size, &crc_val, sizeof(crc_val));
>
>          bytes_to_copy += 4;
>          size += 4;
> --
> 1.9.2
>
>