netdev - Re: [PATCH v4 05/11] net: dsa: microchip: ksz8795: dynamic allocate memory for flush_dyn_mac

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Message-ID: <0b531a88-acde-07bc-1fa3-b95c5bc08ded@gmail.com>
Date:   Mon, 3 Aug 2020 10:40:59 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Michael Grzeschik <m.grzeschik@...gutronix.de>, andrew@...n.ch
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kernel@...gutronix.de
Subject: Re: [PATCH v4 05/11] net: dsa: microchip: ksz8795: dynamic allocate
 memory for flush_dyn_mac_table



On 8/2/2020 10:44 PM, Michael Grzeschik wrote:
> To get the driver working with other chips using different port counts
> the dyn_mac_table should be flushed depending on the amount of physical
> ports.
> 
> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> 
> ---
> v1 -> v4: - extracted this change from bigger previous patch
> 
>  drivers/net/dsa/microchip/ksz8795.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
> index 947ea1e45f5b2c6..ba722f730bf0f7b 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -750,11 +750,11 @@ static void ksz8795_port_stp_state_set(struct dsa_switch *ds, int port,
>  
>  static void ksz8795_flush_dyn_mac_table(struct ksz_device *dev, int port)
>  {
> -	u8 learn[TOTAL_PORT_NUM];
> +	u8 *learn = kzalloc(dev->mib_port_cnt, GFP_KERNEL);

There is no error checking on this allocation, and you could consider
propagating an allocation failure back to the caller for graceful handling.
-- 
Florian