linux-kernel - Re: [PATCH] cxgb4: Use proper enum in cxgb4_dcb_handle_fw

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Message-ID: <CAKwvOdknwESEUK2UTZoTfC9U8vXcVrmpx_1=4jpMxQ25hM=vKA@mail.gmail.com>
Date:   Tue, 2 Oct 2018 15:54:27 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     ganeshgr@...lsio.com, "David S. Miller" <davem@...emloft.net>,
        netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cxgb4: Use proper enum in cxgb4_dcb_handle_fw_update

On Sun, Sep 30, 2018 at 8:54 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> Clang warns when one enumerated type is implicitly converted to another.
>
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c:303:7: warning: implicit
> conversion from enumeration type 'enum cxgb4_dcb_state' to different
> enumeration type 'enum cxgb4_dcb_state_input' [-Wenum-conversion]
>                          ? CXGB4_DCB_STATE_FW_ALLSYNCED
>                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c:304:7: warning: implicit
> conversion from enumeration type 'enum cxgb4_dcb_state' to different
> enumeration type 'enum cxgb4_dcb_state_input' [-Wenum-conversion]
>                          : CXGB4_DCB_STATE_FW_INCOMPLETE);
>                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 2 warnings generated.
>
> Use the equivalent value of the expected type to silence Clang while
> resulting in no functional change.
>
> CXGB4_DCB_STATE_FW_INCOMPLETE = CXGB4_DCB_INPUT_FW_INCOMPLETE = 2
> CXGB4_DCB_STATE_FW_ALLSYNCED = CXGB4_DCB_INPUT_FW_ALLSYNCED = 3

Yep looks good.  There's not too many users of cxgb4_dcb_state_input
in the kernel.  I wonder if it could even be replaced entirely with
cxgb4_dcb_state?  But for now this patch fixes the warning correctly.
Thanks for sending it.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

Looks like this was the second case of this warning in this code (I
thought I was having Deja Vu; that I had already reviewed this patch
earlier): https://lkml.org/lkml/2018/10/1/255 Probably could have been
a single patch, but that's ok.

>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c
> index 6ba3104ff7eb..9bd5f755a0e0 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c
> @@ -300,8 +300,8 @@ void cxgb4_dcb_handle_fw_update(struct adapter *adap,
>                 enum cxgb4_dcb_state_input input =
>                         ((pcmd->u.dcb.control.all_syncd_pkd &
>                           FW_PORT_CMD_ALL_SYNCD_F)
> -                        ? CXGB4_DCB_STATE_FW_ALLSYNCED
> -                        : CXGB4_DCB_STATE_FW_INCOMPLETE);
> +                        ? CXGB4_DCB_INPUT_FW_ALLSYNCED
> +                        : CXGB4_DCB_INPUT_FW_INCOMPLETE);
>
>                 if (dcb->dcb_version != FW_PORT_DCB_VER_UNKNOWN) {
>                         dcb_running_version = FW_PORT_CMD_DCB_VERSION_G(
> --
> 2.19.0
>


-- 
Thanks,
~Nick Desaulniers