netdev - Re: [PATCH] net: dsa: bcm_sf2: Propagate error value from mdio

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Date:   Wed, 26 Dec 2018 20:41:50 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     Aditya Pakki <pakki001@....edu>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: dsa: bcm_sf2: Propagate error value from mdio_write

On 26.12.2018 20:32, Kangjie Lu wrote:
> 
> 
> On Wed, Dec 26, 2018 at 1:13 PM Heiner Kallweit <hkallweit1@...il.com <mailto:hkallweit1@...il.com>> wrote:
> 
>     On 26.12.2018 19:21, Kangjie Lu wrote:
>     > Both bcm_sf2_sw_indir_rw and mdiobus_write_nested could fail, so let's
>     > return their error codes upstream.
>     >
>     > Signed-off-by: Kangjie Lu <kjlu@....edu <mailto:kjlu@....edu>>
>     > ---
>     >  drivers/net/dsa/bcm_sf2.c | 7 +++----
>     >  1 file changed, 3 insertions(+), 4 deletions(-)
>     >
>     > diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
>     > index 2eb68769562c..236815700fba 100644
>     > --- a/drivers/net/dsa/bcm_sf2.c
>     > +++ b/drivers/net/dsa/bcm_sf2.c
>     > @@ -303,11 +303,10 @@ static int bcm_sf2_sw_mdio_write(struct mii_bus *bus, int addr, int regnum,
>     >        * send them to our master MDIO bus controller
>     >        */
>     >       if (addr == BRCM_PSEUDO_PHY_ADDR && priv->indir_phy_mask & BIT(addr))
>     > -             bcm_sf2_sw_indir_rw(priv, 0, addr, regnum, val);
>     > +             return bcm_sf2_sw_indir_rw(priv, 0, addr, regnum, val);
>     This is wrong. Please get familiar with what the function does.
>     And test changes before submitting them!
> 
>  
> bcm_sf2_sw_indir_rw() doesn't return an error code, so we don't propagate its return value but return 0 after it.
> 
> For mdiobus_write_nested(), since it does return an error code, we propagate its error code upstream. 
> 
> Does this sound right to you?
>  
Better. You should test a change before submitting (and better not only compile-test).
And please no HTML mails. Get familiar with the basics of kernel development
before submitting. Read document "SubmittingPatches" and the following for netdev:
https://www.kernel.org/doc/Documentation/networking/netdev-FAQ.txt
By the way: net-next is closed currently.

> 
> 
>     >       else
>     > -             mdiobus_write_nested(priv->master_mii_bus, addr, regnum, val);
>     > -
>     > -     return 0;
>     > +             return mdiobus_write_nested(priv->master_mii_bus,
>     > +                             addr, regnum, val);
>     >  }
>     > 
>     >  static irqreturn_t bcm_sf2_switch_0_isr(int irq, void *dev_id)
>     >
> 
> 
> 
> -- 
> Kangjie Lu
> Assistant Professor
> Department of Computer Science and Engineering
> University of Minnesota
> Personal homepage <https://www-users.cs.umn.edu/~kjlu>