linux-kernel - Re: [PATCH] net/can/mscan: Enable interrupts when all TX buffers are occupied to get notified when they are available again

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Date:	Mon, 28 Nov 2011 15:22:29 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	"Mosler, Martin" <mmo@...hlke.com>
CC:	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"socketcan@...tkopp.net" <socketcan@...tkopp.net>,
	"lucas.demarchi@...fusion.mobi" <lucas.demarchi@...fusion.mobi>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"mkl@...gutronix.de" <mkl@...gutronix.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/can/mscan: Enable interrupts when all TX buffers
 are occupied to get notified when they are available again

On 11/28/2011 02:25 PM, Mosler, Martin wrote:
> When all TX buffers of the mscan are occupied the network layer is told to stop sending further packets. However the TX interrupts are not enabled and therefore the driver has no chance to tell the network layer when it is ready to accept further packets.

Please break lines after 72 chars, or so.

> Signed-off-by: Martin Mosler <mmo@...hlke.com>
> 
> --- linux-2.6/drivers/net/can/mscan/mscan.c.orig    2011-11-28 13:54:29.547850661 +0100
> +++ linux-2.6/drivers/net/can/mscan/mscan.c 2011-11-28 13:55:52.427849601 +0100
> @@ -214,6 +214,7 @@ static netdev_tx_t mscan_start_xmit(stru
>     case 0:
>         netif_stop_queue(dev);
>         dev_err(dev->dev.parent, "Tx Ring full when queue awake!\n");
> +       out_8(&regs->cantier, priv->tx_active);
>         return NETDEV_TX_BUSY;
>     case 1:
>         /*  

I cannot apply this patch. It is white space mangled (no tabs but
spaces, etc.). Please fix your mail agent or, even better, use "git
send-email".

Wolfgang.
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