netdev - Re: [PATCH RFC 3/4] net: phy: add unlocked accessors

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Date:   Sat, 9 Dec 2017 10:22:14 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH RFC 3/4] net: phy: add unlocked accessors



On 12/08/2017 07:48 AM, Russell King wrote:
> Add unlocked versions of the bus accessors, which allows access to the
> bus with all the tracing. These accessors validate that the bus mutex
> is held, which is a basic requirement for all mii bus accesses.
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

> ---
>  include/linux/phy.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index 71d777fe6c3d..964803bd7324 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -716,6 +716,18 @@ static inline int phy_read(struct phy_device *phydev, u32 regnum)
>  }
>  
>  /**
> + * __phy_read - convenience function for reading a given PHY register
> + * @phydev: the phy_device struct
> + * @regnum: register number to read
> + *
> + * The caller must have taken the MDIO bus lock.
> + */
> +static inline int __phy_read(struct phy_device *phydev, u32 regnum)

Do you know if we could have sparse validate that the caller of these
functions holds the mutex? I remember reading somewhere that sparse does
not do that yet, but can't get my hands on it.
-- 
Florian