Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756727Ab3FSNTI (ORCPT ); Wed, 19 Jun 2013 09:19:08 -0400 Received: from etezian.org ([198.101.225.253]:53597 "EHLO mail.etezian.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751925Ab3FSNTG (ORCPT ); Wed, 19 Jun 2013 09:19:06 -0400 Date: Wed, 19 Jun 2013 15:20:28 +0200 From: Andi Shyti To: Joseph CHANG Cc: Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, joseph_chang@davicom.com.tw, josright@hotmail.com Subject: Re: [PATCH 1/1] net: add dm9620 net usb driver Message-ID: <20130619132028.GC13898@jack.whiskey> References: <1371645407-31387-1-git-send-email-josright123@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1371645407-31387-1-git-send-email-josright123@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7004 Lines: 289 Hi Joseph, had a fast look... [ ... ] > +static int dm9620_set_eeprom(struct net_device *net, > + struct ethtool_eeprom *eeprom, u8 *data) > +{ > + struct usbnet *dev = netdev_priv(net); > + int offset = eeprom->offset; > + int len = eeprom->len; > + int done; > + > + if (eeprom->magic != MD96XX_EEPROM_MAGIC) { > + netdev_err(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n", > + eeprom->magic); > + return -EINVAL; > + } > + > + while (len > 0) { > + if (len & 1 || offset & 1) { > + int which = offset & 1; > + u8 tmp[2]; > + dm_read_eeprom_word(dev, offset / 2, tmp); > + tmp[which] = *data; > + dm_write_eeprom_word(dev, offset / 2, tmp); > + mdelay(10); Please don't use mdelay, use msleep or possibly msleep_interruptable > + done = 1; > + } else { > + dm_write_eeprom_word(dev, offset / 2, data); > + done = 2; > + } > + data += done; > + offset += done; > + len -= done; > + } > + return 0; > +} [ ... ] > +static int dm9620_bind(struct usbnet *dev, struct usb_interface *intf) > +{ > + int ret; > + u8 mac[ETH_ALEN], id; > + u16 value; > + > + ret = usbnet_get_endpoints(dev, intf); > + if (ret) > + goto out; maybe here is better if (ret) return ret; > + > + dev->net->netdev_ops = &dm9620_netdev_ops; > + dev->net->ethtool_ops = &dm9620_ethtool_ops; > + dev->net->hard_header_len += DM_TX_OVERHEAD; > + dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; > + > + /* ftp fail fixed */ > + dev->rx_urb_size = dev->net->mtu + ETH_HLEN + DM_RX_OVERHEAD+1; > + > + dev->mii.dev = dev->net; > + dev->mii.mdio_read = dm9620_mdio_read; > + dev->mii.mdio_write = dm9620_mdio_write; > + dev->mii.phy_id_mask = 0x1f; > + dev->mii.reg_num_mask = 0x1f; > + dev->mii.phy_id = DM9620_PHY_ID; > + > + /* reset */ > + dm_write_reg(dev, DM_NET_CTRL, 1); > + udelay(20); from Documentation/timers/timers-howto.txt: SLEEPING FOR "A FEW" USECS ( < ~10us? ): * Use udelay use udelay if you want to sleep for less than 10us, otherwise use usleep_range > + > + /* read MAC */ > + if (dm_read(dev, DM_PHY_ADDR, ETH_ALEN, mac) < 0) { > + netdev_err(dev->net, "Error reading MAC address\n"); > + ret = -ENODEV; > + goto out; > + } you can get read of the 'out' label if in all the goto you use you just 'return -ENODEV;' instead of 'goto out;' > + > + /* Overwrite the auto-generated address only with good ones */ > + if (is_valid_ether_addr(mac)) > + memcpy(dev->net->dev_addr, mac, ETH_ALEN); > + else { > + netdev_warn(dev->net, > + "dm9620: No valid MAC address in EEPROM, using %pM\n", > + dev->net->dev_addr); > + __dm9620_set_mac_address(dev); > + } > + > + if (dm_read_reg(dev, DM_CHIP_ID, &id) < 0) { > + netdev_err(dev->net, "Error reading chip ID\n"); > + ret = -ENODEV; > + goto out; same here > + } > + > + dm_read(dev, DM_PID, 2, &value); > + > + /* Add for check Product dm9620a/21a */ > + if (value == 0x1269 || value == 0x0269) > + dm_write_reg(dev, DM_MODE_CTRL, DM_MODE9620 | DM_MODE_CDC_DES); > + else > + dm_write_reg(dev, DM_MODE_CTRL, DM_MODE9620); > + > + dm_write_reg(dev, DM_RX_CRC_CTRL, DM_RX_RCSEN); > + > + /* power up phy */ > + dm_write_reg(dev, DM_GPR_CTRL, 1); > + dm_write_reg(dev, DM_GPR_DATA, 0); > + > + /* receive broadcast packets */ > + dm9620_set_multicast(dev->net); > + > + dm9620_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET); > + > + /* TX Pause Packet Enable */ > + dm_write_reg(dev, DM_FCR, DM_FCR_TXPEN | DM_FCR_BKPM | DM_FCR_FLCE); > + > + /* ADVERTISE_PAUSE_CAP */ > + dm9620_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE, > + ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP); > + > + dm_write_reg(dev, DM_USB_CTRL, DM_USB_EP3ACK); > + > + mii_nway_restart(&dev->mii); > + > +out: > + return ret; yeah... you wouldn't need this anymore > +} > + > +void dm9620_unbind(struct usbnet *dev, struct usb_interface *intf) Should this be static? > +{ > + netdev_warn(dev->net, "[dm962] Linux Driver = V2.6 - unbind\n"); > +} > + > +static int dm9620_rx_fixup(struct usbnet *dev, struct sk_buff *skb) > +{ > + u8 status; > + int len; > + > + /* format: > + b0: rx_flag > + b1: rx status > + b2: packet length (incl crc) low > + b3: packet length (incl crc) high > + b4..n-4: packet data > + bn-3..bn: ethernet crc > + */ Allow me this nitpick please check the coding style for comments in Documentation/CodyngStyle: For files in net/ and drivers/net/ the preferred style for long (multi-line) comments is a little different. /* The preferred comment style for files in net/ and * drivers/net * looks like this. * * It is nearly the same as the generally preferred * comment style, * but there is no initial almost-blank line. */ > + if (unlikely(skb->len < DM_RX_OVERHEAD)) { > + dev_err(&dev->udev->dev, "unexpected tiny rx frame\n"); > + return 0; > + } > + > + status = skb->data[1]; > + len = (skb->data[2] | (skb->data[3] << 8)) - 4; > + > + if (unlikely(status & 0xbf)) { > + if (status & 0x01) > + dev->net->stats.rx_fifo_errors++; > + if (status & 0x02) > + dev->net->stats.rx_crc_errors++; > + if (status & 0x04) > + dev->net->stats.rx_frame_errors++; > + if (status & 0x20) > + dev->net->stats.rx_missed_errors++; > + if (status & 0x90) > + dev->net->stats.rx_length_errors++; > + return 0; > + } > + > + skb_pull(skb, 4); > + skb_trim(skb, len); > + > + return 1; > +} > + > +static bool davicom_bulkout_fix(int len, unsigned fullp) > +{ > + len = ((len+1)/2)*2; > + len += 2; > + if ((len % fullp) == 0) > + return true; > + return false; personally here I like more the form return !(len % fullp) ? true : false; But this is more a nitpick, you don't really need to change > +} > + > +static int dm9620_tx_oddadd_len(int len) > +{ > + if (len & 1) > + return 1; > + return 0; (len & 1) is the same as (len == 1), personally I find it a bit ugly, I would rather write it differently: return (len == 1) ? 1 : 0; or if you like the '&' return len & 1; > +} > + > +static const struct usb_device_id products[] = { > + { > + USB_DEVICE(0x0a46, 0x9620), /* dm9620 */ > + .driver_info = (unsigned long)&dm9620_info, > + }, > + { > + USB_DEVICE(0x0a46, 0x9621), /* dm9621 */ > + .driver_info = (unsigned long)&dm9620_info, > + }, > + { > + USB_DEVICE(0x0a46, 0x9622), /* dm9622 */ > + .driver_info = (unsigned long)&dm9620_info, > + }, > + { > + USB_DEVICE(0x0a46, 0x0269), /* dm9620a */ > + .driver_info = (unsigned long)&dm9620_info, > + }, > + { > + USB_DEVICE(0x0a46, 0x1269), /* dm9621a */ > + .driver_info = (unsigned long)&dm9620_info, > + }, > + {}, > +}; It would be cool if in the code we could have some logical defines for all the hexadecimal values you are using all around the code ;) Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/