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Re: [Qemu-devel] [PATCH] net: e1000e: fix dead code in e1000e_write_pack


From: Dmitry Fleytman
Subject: Re: [Qemu-devel] [PATCH] net: e1000e: fix dead code in e1000e_write_packet_to_guest
Date: Thu, 26 Jan 2017 18:19:41 +0200

Good catch!

Reviewed-by: Dmitry Fleytman <address@hidden>

> On 26 Jan 2017, at 12:10 PM, Paolo Bonzini <address@hidden> wrote:
> 
> Because is_first is declared inside a loop, it is always true.  The store
> is dead, and so is the "else" branch of "if (is_first)".  is_last is
> okay though.
> 
> Reported by Coverity.
> 
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
> hw/net/e1000e_core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
> index 2b11499..c99e2fb 100644
> --- a/hw/net/e1000e_core.c
> +++ b/hw/net/e1000e_core.c
> @@ -1507,6 +1507,7 @@ e1000e_write_packet_to_guest(E1000ECore *core, struct 
> NetRxPkt *pkt,
>     const E1000E_RingInfo *rxi;
>     size_t ps_hdr_len = 0;
>     bool do_ps = e1000e_do_ps(core, pkt, &ps_hdr_len);
> +    bool is_first = true;
> 
>     rxi = rxr->i;
> 
> @@ -1514,7 +1515,6 @@ e1000e_write_packet_to_guest(E1000ECore *core, struct 
> NetRxPkt *pkt,
>         hwaddr ba[MAX_PS_BUFFERS];
>         e1000e_ba_state bastate = { { 0 } };
>         bool is_last = false;
> -        bool is_first = true;
> 
>         desc_size = total_size - desc_offset;
> 
> -- 
> 2.9.3
> 




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