linux-kernel - Re: [PATCH] phy: intel: Eliminate unnecessary assignment in intel_cbphy_set

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Date:   Mon, 15 Jun 2020 17:30:04 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] phy: intel: Eliminate unnecessary assignment in
 intel_cbphy_set_mode

On Fri, May 22, 2020 at 08:50:43PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/phy/intel/phy-intel-combo.c:202:34: warning: implicit conversion
> from enumeration type 'enum intel_phy_mode' to different enumeration
> type 'enum intel_combo_mode' [-Wenum-conversion]
>         enum intel_combo_mode cb_mode = PHY_PCIE_MODE;
>                               ~~~~~~~   ^~~~~~~~~~~~~
> 1 warning generated.
> 
> The correct enum to use would be PCIE0_PCIE1_MODE. However, eliminating
> this assignment is a little better because the switch statement always
> assigns a new value to cb_mode, which also takes care of the warning.
> 
> Fixes: ac0a95a3ea78 ("phy: intel: Add driver support for ComboPhy")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1034
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/phy/intel/phy-intel-combo.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/intel/phy-intel-combo.c b/drivers/phy/intel/phy-intel-combo.c
> index c2a35be4cdfb..4bc1276ecf23 100644
> --- a/drivers/phy/intel/phy-intel-combo.c
> +++ b/drivers/phy/intel/phy-intel-combo.c
> @@ -199,9 +199,9 @@ static int intel_cbphy_pcie_dis_pad_refclk(struct intel_cbphy_iphy *iphy)
>  
>  static int intel_cbphy_set_mode(struct intel_combo_phy *cbphy)
>  {
> -	enum intel_combo_mode cb_mode = PHY_PCIE_MODE;
>  	enum aggregated_mode aggr = cbphy->aggr_mode;
>  	struct device *dev = cbphy->dev;
> +	enum intel_combo_mode cb_mode;
>  	enum intel_phy_mode mode;
>  	int ret;
>  
> 
> base-commit: c11d28ab4a691736e30b49813fb801847bd44e83
> -- 
> 2.27.0.rc0
> 

Gentle ping for review. Nick did comment that maybe keeping the
assignment and tidying up one of the switch cases would be better but
every maintainer has their preference. This warning has slipped into
mainline so it would be nice to get it cleaned up.

Cheers,
Nathan