linux-kernel - Re: [PATCH] net: sfp: Unique GPIO interrupt names

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Date:   Mon, 6 Jul 2020 22:07:42 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Chris Healy <cphealy@...il.com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, kuba@...nel.org,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: sfp: Unique GPIO interrupt names

On Mon, Jul 06, 2020 at 12:38:37PM -0700, Chris Healy wrote:
> Dynamically generate a unique GPIO interrupt name, based on the
> device name and the GPIO name.  For example:
> 
> 103:          0   sx1503q  12 Edge      sff2-los
> 104:          0   sx1503q  13 Edge      sff3-los
> 
> The sffX indicates the SFP the loss of signal GPIO is associated with.

Hi Chris

For netdev, please put inside the [PATCH] part of the subject, which
tree this is for, i.e. net-next.

> Signed-off-by: Chris Healy <cphealy@...il.com>
> ---
>  drivers/net/phy/sfp.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index 73c2969f11a4..9b03c7229320 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -220,6 +220,7 @@ struct sfp {
>      struct phy_device *mod_phy;
>      const struct sff_data *type;
>      u32 max_power_mW;
> +    char sfp_irq_name[32];
> 
>      unsigned int (*get_state)(struct sfp *);
>      void (*set_state)(struct sfp *, unsigned int);
> @@ -2349,12 +2350,15 @@ static int sfp_probe(struct platform_device *pdev)
>              continue;
>          }
> 
> +        snprintf(sfp->sfp_irq_name, sizeof(sfp->sfp_irq_name),
> +             "%s-%s", dev_name(sfp->dev), gpio_of_names[i]);
> +

This is perfectly O.K, but you could consider using
devm_kasprintf(). That will allocate as much memory as needed for the
string, and hence avoid truncation issues, which we have seen before
with other interrupt names.

     Andrew