netdev - Re: [PATCH v2 net-next 3/5] dsa: add DSA switch driver for Microchip KSZ9477

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Message-ID: <7f0c4c6a-a6fd-5c4f-9c40-f23f694cee6f@cogentembedded.com>
Date:   Sun, 14 May 2017 12:13:37 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Andrew Lunn <andrew@...n.ch>, Woojung.Huh@...rochip.com
Cc:     f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        netdev@...r.kernel.org, davem@...emloft.net,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 net-next 3/5] dsa: add DSA switch driver for Microchip
 KSZ9477

Hello!

On 5/13/2017 5:56 PM, Andrew Lunn wrote:

[...]

>> +static int ksz_reset_switch(struct dsa_switch *ds)
>> +{
>> +	struct ksz_device *dev = ds->priv;
>> +	u8 data8;
>> +	u16 data16;
>> +	u32 data32;
>> +
>
> ...
>
>> +
>> +	memset(dev->vlan_cache, 0, sizeof(*dev->vlan_cache) * dev->num_vlans);
>> +
>> +	return 0;
>> +}
>
>> +static int ksz_setup(struct dsa_switch *ds)
>> +{
>> +	struct ksz_device *dev = ds->priv;
>> +	int ret = 0;
>> +
>> +	dev->vlan_cache = devm_kmalloc_array(dev->dev,
>> +					     sizeof(struct vlan_table),
>> +					     dev->num_vlans, GFP_KERNEL);
>
> You should check, but i think devm_kmalloc_array sets the allocated
> memory to 0.

    No. Else there would be no need for it, since kcalloc() is a function that 
allocates the arrays and zeroes them.

> So i don't think you need the memset. If it is needed, i
> would move it here, after the check the allocation is successful.

    If it could be done here, kcalloc() should be used.

[...]

MBR, Sergei