netdev - Re: [PATCH/RFC v4 net-next] ravb: Add dma queue interrupt support

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Date:	Sun, 7 Feb 2016 20:18:00 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Yoshihiro Kaneko <ykaneko0929@...il.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH/RFC v4 net-next] ravb: Add dma queue interrupt support

On 02/07/2016 07:56 PM, Yoshihiro Kaneko wrote:

>>> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>>>
>>> This patch supports the following interrupts.
>>>
>>> - One interrupt for multiple (descriptor, error, management)
>>> - One interrupt for emac
>>> - Four interrupts for dma queue (best effort rx/tx, network control rx/tx)
>>>
>>> This patch improve efficiency of the interrupt handler by adding the
>>> interrupt handler corresponding to each interrupt source described
>>> above. Additionally, it reduces the number of times of the access to
>>> EthernetAVB IF.
>>>
>>> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>>> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@...il.com>
>>
>>
>> [...]
>>
>>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c
>>> b/drivers/net/ethernet/renesas/ravb_main.c
>>> index ac43ed9..076f25f 100644
>>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>>
>> [...]
>>>
>>> @@ -1215,29 +1332,64 @@ static const struct ethtool_ops ravb_ethtool_ops =
>>> {
>>>          .get_ts_info            = ravb_get_ts_info,
>>>    };
>>>
>>> +static inline int hook_irq(unsigned int irq, irq_handler_t handler,
>>> +                          struct net_device *ndev, struct device *dev,
>>> +                          const char *ch)
>>> +{
>>> +       char *name;
>>> +       int error;
>>> +
>>> +       name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", ndev->name, ch);
>>
>>
>>     BTW, shouldn't we test 'name' for NULL here?
>
> Thanks.
> I will fix it to return -ENOMEM if 'name' is NULL.

    Be sure to use '!name' -- it's preferred in the networking code.

> Thanks,
> kaneko

MBR, Sergei