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

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Date:	Thu, 28 Jan 2016 20:32:21 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Yoshihiro Kaneko <ykaneko0929@...il.com>, netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org
Subject: Re: [PATCH/RFC v4 net-next] ravb: Add dma queue interrupt support

On 01/24/2016 06:52 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?

> +	error = request_irq(irq, handler, IRQF_SHARED, name, ndev);
> +	if (error)
> +		netdev_err(ndev, "cannot request IRQ %s\n", name);
> +
> +	return error;
> +}
> +

MBR, Sergei