netdev - Re: [PATCH v3] can: Add driver for esd CAN-USB/2 device

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Message-Id: <201005281725.32049.matthias.fuchs@esd.eu>
Date:	Fri, 28 May 2010 17:25:31 +0200
From:	Matthias Fuchs <matthias.fuchs@....eu>
To:	Viral Mehta <Viral.Mehta@...infotech.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Socketcan-core@...ts.berlios.de" <Socketcan-core@...ts.berlios.de>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3] can: Add driver for esd CAN-USB/2 device

Hi Viral,

thanks for review. Please see some comments below.

On Wednesday 26 May 2010 13:31, Viral Mehta wrote:
> Hi,
> >________________________________________
> >From: linux-usb-owner@...r.kernel.org [linux-usb-owner@...r.kernel.org] On Behalf Of Matthias Fuchs [matthias.fuchs@....eu]
> >Sent: Wednesday, May 26, 2010 2:44 PM
> >To: netdev@...r.kernel.org
> >Cc: Socketcan-core@...ts.berlios.de; linux-usb@...r.kernel.org
> >Subject: [PATCH v3] can: Add driver for esd CAN-USB/2 device
> >+
> >+       BUG_ON(!context);
> 
> It is preferred to used WARN_ON and avoid using BUG_ON and thus dont kill the whole system....
Really? Even when next line will reference a NULL pointer in this case? Ok. Will be changed.

> [...]
> >+
> >+       priv = context->priv;
> >+       netdev = priv->netdev;
> >+       dev = priv->usb2;
> >+       err = usb_submit_urb(urb, GFP_ATOMIC);
> >+       if (err) {
> >+               can_free_echo_skb(netdev, context->echo_index);
> >+
> >+               atomic_dec(&priv->active_tx_jobs);
> >+               usb_unanchor_urb(urb);
> >+
> >+               stats->tx_dropped++;
> >+
> >+               if (err == -ENODEV)
> >+                       netif_device_detach(netdev);
> >+               else
> >+                       dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err);
> >+
> >+               goto releasebuf;
> 
> You probably want to set "ret" here or do you really want to return NETDEV_TX_OK
As far as I can see netword device drivers xmit_start() return NETDEV_TX_OK or _BUSY.
There are no real alternatives. But please correct me when I am wrong.

Your other comments will be fixed by version 4 of my patch.

Matthias
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