From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Sun, 13 Dec 2015 16:25:34 +0000
Subject: Re: [PATCH v2 net] ravb: Remove clear unhandled interrupt
Message-Id: <566D9BFE.5010304@cogentembedded.com>
List-Id: <linux-sh.vger.kernel.org>
References: <1450019545-32540-1-git-send-email-ykaneko0929@gmail.com>
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To: Yoshihiro Kaneko <ykaneko0929@gmail.com>, netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>, Simon Horman <horms@verge.net.au>, Magnus Damm <magnus.damm@gmail.com>, linux-sh@vger.kernel.org

Hello.

On 12/13/2015 06:12 PM, Yoshihiro Kaneko wrote:

    The subject doesn't seem to reflect what the patch is doing.

> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
>
> AVB-DMAC Receive FIFO Warning interrupt is not enabled, so it is not
> necessary to disable the interrupt in ndo_close().
> On the other hand, this patch disables the interrupt in ndo_open() to
> prevent the possibility that the interrupt is issued by the state that
> a boot loader left.
>
> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
> ---
>
> This patch is based on the master branch of David Miller's networking
> tree.
>
> v2 [Yoshihiro Kaneko]
> * compile tested only
> * As suggested by Sergei Shtylyov
>    - clear RIC1 in ndo_open() to disable the interrupt regardless of
>      a left state from a bootloader.
>
>
>   drivers/net/ethernet/renesas/ravb_main.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index b69e0c2..5e34a88 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1228,6 +1228,9 @@ static int ravb_open(struct net_device *ndev)
>   		goto out_free_irq2;
>   	ravb_emac_init(ndev);
>
> +	/* Disable unhandled interrupt */
> +	ravb_write(ndev, 0, RIC1);
> +

    Oh, I thought the interrupt masks are programmed here but they are set in 
ravb_dmac_init() that this function calls. Please do it there instead (where 
it was originally done).

[...]

MBR, Sergei