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

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Date:	Mon, 31 May 2010 12:05:50 +0530
From:	Viral Mehta <Viral.Mehta@...infotech.com>
To:	Matthias Fuchs <matthias.fuchs@....eu>
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,

> -----Original Message-----
> From: Matthias Fuchs [mailto:matthias.fuchs@....eu]
> Sent: Friday, May 28, 2010 8:56 PM
> To: Viral Mehta
> Cc: netdev@...r.kernel.org; Socketcan-core@...ts.berlios.de; 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.

How about,
if(!context)
        return;

Look at the other drivers for example.
I, personally, dont care since I will not be using your driver but I am sure that other people, too, wont like BUG_ON....

>
> > [...]
> > >+
> > >+       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.
Yup. this is okie....

>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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