From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
Jose Abreu <joabreu@synopsys.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
"David S . Miller" <davem@davemloft.net>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] net: stmmac: xgmac: add missing parentheses to fix precendence error
Date: Wed, 2 Oct 2019 16:33:57 +0300 [thread overview]
Message-ID: <20191002133356.GP22609@kadam> (raw)
In-Reply-To: <20191002110849.13405-1-colin.king@canonical.com>
On Wed, Oct 02, 2019 at 12:08:49PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> The expression !(hw_cap & XGMAC_HWFEAT_RAVSEL) >> 10 is always zero, so
> the masking operation is incorrect. Fix this by adding the missing
> parentheses to correctly bind the negate operator on the entire expression.
>
> Addresses-Coverity: ("Operands don't affect result")
> Fixes: c2b69474d63b ("net: stmmac: xgmac: Correct RAVSEL field interpretation")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> index 965cbe3e6f51..2e814aa64a5c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> @@ -369,7 +369,7 @@ static void dwxgmac2_get_hw_feature(void __iomem *ioaddr,
> dma_cap->eee = (hw_cap & XGMAC_HWFEAT_EEESEL) >> 13;
> dma_cap->atime_stamp = (hw_cap & XGMAC_HWFEAT_TSSEL) >> 12;
> dma_cap->av = (hw_cap & XGMAC_HWFEAT_AVSEL) >> 11;
> - dma_cap->av &= !(hw_cap & XGMAC_HWFEAT_RAVSEL) >> 10;
> + dma_cap->av &= !((hw_cap & XGMAC_HWFEAT_RAVSEL) >> 10);
There is no point to the shift at all.
regards,
dan carpenter
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next prev parent reply other threads:[~2019-10-02 13:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-02 11:08 [PATCH] net: stmmac: xgmac: add missing parentheses to fix precendence error Colin King
2019-10-02 13:33 ` Dan Carpenter [this message]
2019-10-02 13:40 ` Colin Ian King
2019-10-02 13:42 ` Dan Carpenter
2019-10-02 13:53 ` Colin Ian King
2019-10-02 14:07 ` Dan Carpenter
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