Hi,
>________________________________________
>From: linux-usb-owner@xxxxxxxxxxxxxxx [linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of Matthias Fuchs [matthias.fuchs@xxxxxx]
>Sent: Wednesday, May 26, 2010 2:44 PM
>To: netdev@xxxxxxxxxxxxxxx
>Cc: Socketcan-core@xxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx
>Subject: [PATCH v3] can: Add driver for esd CAN-USB/2 device
>
>This patch adds a driver for esd's USB high speed
>CAN interface. The driver supports devices with
>multiple CAN interfaces.
>
>Signed-off-by: Matthias Fuchs <matthias.fuchs@xxxxxx>
>---
>+static void esd_usb2_write_bulk_callback(struct urb *urb)
>+{
>+ struct esd_tx_urb_context *context = urb->context;
>+ struct esd_usb2_net_priv *priv;
>+ struct esd_usb2 *dev;
>+ struct net_device *netdev;
>+ size_t size = sizeof(struct esd_usb2_msg);
>+
>+ BUG_ON(!context);
It is preferred to used WARN_ON and avoid using BUG_ON and thus dont kill the whole system....
[...]
>+
>+ 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
>+ }
[...]
>+static int esd_usb2_close(struct net_device *netdev)
>+{
>+ struct esd_usb2_net_priv *priv = netdev_priv(netdev);
>+ struct esd_usb2_msg msg;
>+ int i;
>+
>+ /* Disable all IDs (see esd_usb2_start()) */
>+ msg.msg.hdr.cmd = CMD_IDADD;
>+ msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
>+ msg.msg.filter.net = priv->index;
>+ msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
>+ for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
>+ msg.msg.filter.mask[i] = 0;
>+ esd_usb2_send_msg(priv->usb2, &msg);
Probably, you may not care but it can return error value....
>+
>+ /* set CAN controller to reset mode */
>+ msg.msg.hdr.len = 2;
>+ msg.msg.hdr.cmd = CMD_SETBAUD;
>+ msg.msg.setbaud.net = priv->index;
>+ msg.msg.setbaud.rsvd = 0;
>+ msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
>+ esd_usb2_send_msg(priv->usb2, &msg);
Probably, you may not care but it can return error value....
>+
>+ priv->can.state = CAN_STATE_STOPPED;
>+
>+ netif_stop_queue(netdev);
>+
>+ close_candev(netdev);
>+
[...]
>+static int esd_usb2_probe(struct usb_interface *intf,
>+ const struct usb_device_id *id)
>+{
>+ struct esd_usb2 *dev;
>+ struct esd_usb2_msg msg;
>+ int i, err = -ENOMEM;
>+
>+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
>+ if (!dev)
>+ return -ENOMEM;
You probably would like to rewrite "return" statements.... for example, above you define err=-ENOMEM
and then here you are saying "return -ENOMEM" later on at the end you are saying "return err";
Also, people prefer and practice to have only one return point. Read further.
>+
>+ dev->udev = interface_to_usbdev(intf);
>+
>+ init_usb_anchor(&dev->rx_submitted);
>+
>+ usb_set_intfdata(intf, dev);
>+
>+ /* query number of CAN interfaces (nets) */
>+ msg.msg.hdr.cmd = CMD_VERSION;
>+ msg.msg.hdr.len = 2;
>+ msg.msg.version.rsvd = 0;
>+ msg.msg.version.flags = 0;
>+ msg.msg.version.drv_version = 0;
>+
>+ if (esd_usb2_send_msg(dev, &msg) < 0) {
>+ dev_err(&intf->dev, "sending version message failed\n");
>+ goto free_dev;
You might like to set "err" here, since you are not propogating error values properly.....
Irrespective of what esd_usb2_send_msg and thus in turn usb_bulk_msg returns,
you are ignoring those values and always returning -ENOMEM at the end......
>+ }
>+
>+ if (esd_usb2_wait_msg(dev, &msg) < 0) {
>+ dev_err(&intf->dev, "no version message answer\n");
>+ goto free_dev;
Same here.
>+free_dev:
>+ kfree(dev);
>+ return err;
>+}
HTH,
Viral Mehta
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