linux-kernel - Re: [PATCH][next] phy: mvebu-cp110-comphy: fix -ve error return against a u32

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Message-ID: <20170901072651.GB26758@kwain>
Date:   Fri, 1 Sep 2017 09:26:51 +0200
From:   Antoine Tenart <antoine.tenart@...e-electrons.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        "David S . Miller" <davem@...emloft.net>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] phy: mvebu-cp110-comphy: fix -ve error return
 against a u32

Hi Colin,

On Thu, Aug 31, 2017 at 05:43:49PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The check to see if the call to mvebu_comphy_get_mux failed is always
> false because mux is a u32 and can never be less than zero. Fix this
> by making mux an int and casting to u32 on shift later on.
> 
> Detected by CoverityScan, CID#1455220 ("Unsigned compared against 0")
> 
> Fixes: d0438bd6aa09 ("phy: add the mvebu cp110 comphy driver")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

I actually have the very same fix in my local tree :) You sent it first
so,

Acked-by: Antoine Tenart <antoine.tenart@...e-electrons.com>

Thanks!
Antoine

> ---
>  drivers/phy/marvell/phy-mvebu-cp110-comphy.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/phy/marvell/phy-mvebu-cp110-comphy.c b/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
> index 73ebad6634a7..7e21b2a977b9 100644
> --- a/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
> +++ b/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
> @@ -468,8 +468,8 @@ static int mvebu_comphy_power_on(struct phy *phy)
>  {
>  	struct mvebu_comphy_lane *lane = phy_get_drvdata(phy);
>  	struct mvebu_comphy_priv *priv = lane->priv;
> -	int ret;
> -	u32 mux, val;
> +	int ret, mux;
> +	u32 val;
>  
>  	mux = mvebu_comphy_get_mux(lane->id, lane->port, lane->mode);
>  	if (mux < 0)
> @@ -477,7 +477,7 @@ static int mvebu_comphy_power_on(struct phy *phy)
>  
>  	regmap_read(priv->regmap, MVEBU_COMPHY_SELECTOR, &val);
>  	val &= ~(0xf << MVEBU_COMPHY_SELECTOR_PHY(lane->id));
> -	val |= mux << MVEBU_COMPHY_SELECTOR_PHY(lane->id);
> +	val |= (u32)mux << MVEBU_COMPHY_SELECTOR_PHY(lane->id);
>  	regmap_write(priv->regmap, MVEBU_COMPHY_SELECTOR, val);
>  
>  	switch (lane->mode) {
> -- 
> 2.14.1
> 

-- 
Antoine Ténart, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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