linux-kernel - Re: [PATCH] phy: phy-meson-g12a-usb2: Fix GENMASK misuse

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Date:   Sat, 22 Feb 2020 18:15:12 -0800
From:   Joe Perches <joe@...ches.com>
To:     Ondrej Jirman <megous@...ous.com>, linux-kernel@...r.kernel.org
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "moderated list:ARM/Amlogic Meson SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Amlogic Meson SoC support" 
        <linux-amlogic@...ts.infradead.org>
Subject: Re: [PATCH] phy: phy-meson-g12a-usb2: Fix GENMASK misuse

On Sun, 2020-02-23 at 00:51 +0100, Ondrej Jirman wrote:
> Arguments to GENMASK should be msb >= lsb.
> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
> I just grepped the whole kernel tree for GENMASK argument order issues,
> and this is one of the three that popped up. No testing was done.

Both of these were submitted last year.
https://lkml.org/lkml/2019/7/10/20

I hope they get applied one day.

Neither patch has an affect today as none of the
#defines are used.

Perhaps deleting the #defines is better.

>  drivers/phy/amlogic/phy-meson-g12a-usb2.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/amlogic/phy-meson-g12a-usb2.c b/drivers/phy/amlogic/phy-meson-g12a-usb2.c
> index 9065ffc85eb47..cd7eccab26490 100644
> --- a/drivers/phy/amlogic/phy-meson-g12a-usb2.c
> +++ b/drivers/phy/amlogic/phy-meson-g12a-usb2.c
> @@ -66,7 +66,7 @@
>  #define PHY_CTRL_R14						0x38
>  	#define PHY_CTRL_R14_I_RDP_EN				BIT(0)
>  	#define PHY_CTRL_R14_I_RPU_SW1_EN			BIT(1)
> -	#define PHY_CTRL_R14_I_RPU_SW2_EN			GENMASK(2, 3)
> +	#define PHY_CTRL_R14_I_RPU_SW2_EN			GENMASK(3, 2)
>  	#define PHY_CTRL_R14_PG_RSTN				BIT(4)
>  	#define PHY_CTRL_R14_I_C2L_DATA_16_8			BIT(5)
>  	#define PHY_CTRL_R14_I_C2L_ASSERT_SINGLE_EN_ZERO	BIT(6)