As suggested by Vincent Mailhol, declare struct esd_usb_msg as a union instead of a struct. Then replace all msg->msg.something constructs, that make use of esd_usb_msg, with simpler and prettier looking msg->something variants. Link: https://lore.kernel.org/all/CAMZ6RqKRzJwmMShVT9QKwiQ5LJaQupYqkPkKjhRBsP=12QYpfA@xxxxxxxxxxxxxx/ Suggested-by: Vincent MAILHOL <mailhol.vincent@xxxxxxxxxx> Signed-off-by: Frank Jungclaus <frank.jungclaus@xxxxxx> --- drivers/net/can/usb/esd_usb.c | 166 +++++++++++++++++----------------- 1 file changed, 82 insertions(+), 84 deletions(-) diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c index 55b36973952d..e78bb468115a 100644 --- a/drivers/net/can/usb/esd_usb.c +++ b/drivers/net/can/usb/esd_usb.c @@ -174,17 +174,15 @@ struct set_baudrate_msg { }; /* Main message type used between library and application */ -struct __packed esd_usb_msg { - union { - struct header_msg hdr; - struct version_msg version; - struct version_reply_msg version_reply; - struct rx_msg rx; - struct tx_msg tx; - struct tx_done_msg txdone; - struct set_baudrate_msg setbaud; - struct id_filter_msg filter; - } msg; +union __packed esd_usb_msg { + struct header_msg hdr; + struct version_msg version; + struct version_reply_msg version_reply; + struct rx_msg rx; + struct tx_msg tx; + struct tx_done_msg txdone; + struct set_baudrate_msg setbaud; + struct id_filter_msg filter; }; static struct usb_device_id esd_usb_table[] = { @@ -229,22 +227,22 @@ struct esd_usb_net_priv { }; static void esd_usb_rx_event(struct esd_usb_net_priv *priv, - struct esd_usb_msg *msg) + union esd_usb_msg *msg) { struct net_device_stats *stats = &priv->netdev->stats; struct can_frame *cf; struct sk_buff *skb; - u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; + u32 id = le32_to_cpu(msg->rx.id) & ESD_IDMASK; if (id == ESD_EV_CAN_ERROR_EXT) { - u8 state = msg->msg.rx.ev_can_err_ext.status; - u8 ecc = msg->msg.rx.ev_can_err_ext.ecc; - u8 rxerr = msg->msg.rx.ev_can_err_ext.rec; - u8 txerr = msg->msg.rx.ev_can_err_ext.tec; + u8 state = msg->rx.ev_can_err_ext.status; + u8 ecc = msg->rx.ev_can_err_ext.ecc; + u8 rxerr = msg->rx.ev_can_err_ext.rec; + u8 txerr = msg->rx.ev_can_err_ext.tec; netdev_dbg(priv->netdev, "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n", - msg->msg.rx.dlc, state, ecc, rxerr, txerr); + msg->rx.dlc, state, ecc, rxerr, txerr); skb = alloc_can_err_skb(priv->netdev, &cf); @@ -322,7 +320,7 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv, } static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, - struct esd_usb_msg *msg) + union esd_usb_msg *msg) { struct net_device_stats *stats = &priv->netdev->stats; struct can_frame *cf; @@ -333,7 +331,7 @@ static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, if (!netif_device_present(priv->netdev)) return; - id = le32_to_cpu(msg->msg.rx.id); + id = le32_to_cpu(msg->rx.id); if (id & ESD_EVENT) { esd_usb_rx_event(priv, msg); @@ -345,17 +343,17 @@ static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, } cf->can_id = id & ESD_IDMASK; - can_frame_set_cc_len(cf, msg->msg.rx.dlc & ~ESD_RTR, + can_frame_set_cc_len(cf, msg->rx.dlc & ~ESD_RTR, priv->can.ctrlmode); if (id & ESD_EXTID) cf->can_id |= CAN_EFF_FLAG; - if (msg->msg.rx.dlc & ESD_RTR) { + if (msg->rx.dlc & ESD_RTR) { cf->can_id |= CAN_RTR_FLAG; } else { for (i = 0; i < cf->len; i++) - cf->data[i] = msg->msg.rx.data[i]; + cf->data[i] = msg->rx.data[i]; stats->rx_bytes += cf->len; } @@ -366,7 +364,7 @@ static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, } static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, - struct esd_usb_msg *msg) + union esd_usb_msg *msg) { struct net_device_stats *stats = &priv->netdev->stats; struct net_device *netdev = priv->netdev; @@ -375,9 +373,9 @@ static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, if (!netif_device_present(netdev)) return; - context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; + context = &priv->tx_contexts[msg->txdone.hnd & (MAX_TX_URBS - 1)]; - if (!msg->msg.txdone.status) { + if (!msg->txdone.status) { stats->tx_packets++; stats->tx_bytes += can_get_echo_skb(netdev, context->echo_index, NULL); @@ -417,32 +415,32 @@ static void esd_usb_read_bulk_callback(struct urb *urb) } while (pos < urb->actual_length) { - struct esd_usb_msg *msg; + union esd_usb_msg *msg; - msg = (struct esd_usb_msg *)(urb->transfer_buffer + pos); + msg = (union esd_usb_msg *)(urb->transfer_buffer + pos); - switch (msg->msg.hdr.cmd) { + switch (msg->hdr.cmd) { case CMD_CAN_RX: - if (msg->msg.rx.net >= dev->net_count) { + if (msg->rx.net >= dev->net_count) { dev_err(dev->udev->dev.parent, "format error\n"); break; } - esd_usb_rx_can_msg(dev->nets[msg->msg.rx.net], msg); + esd_usb_rx_can_msg(dev->nets[msg->rx.net], msg); break; case CMD_CAN_TX: - if (msg->msg.txdone.net >= dev->net_count) { + if (msg->txdone.net >= dev->net_count) { dev_err(dev->udev->dev.parent, "format error\n"); break; } - esd_usb_tx_done_msg(dev->nets[msg->msg.txdone.net], + esd_usb_tx_done_msg(dev->nets[msg->txdone.net], msg); break; } - pos += msg->msg.hdr.len << 2; + pos += msg->hdr.len << 2; if (pos > urb->actual_length) { dev_err(dev->udev->dev.parent, "format error\n"); @@ -473,7 +471,7 @@ static void esd_usb_write_bulk_callback(struct urb *urb) struct esd_tx_urb_context *context = urb->context; struct esd_usb_net_priv *priv; struct net_device *netdev; - size_t size = sizeof(struct esd_usb_msg); + size_t size = sizeof(union esd_usb_msg); WARN_ON(!context); @@ -529,20 +527,20 @@ static ssize_t nets_show(struct device *d, } static DEVICE_ATTR_RO(nets); -static int esd_usb_send_msg(struct esd_usb *dev, struct esd_usb_msg *msg) +static int esd_usb_send_msg(struct esd_usb *dev, union esd_usb_msg *msg) { int actual_length; return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), msg, - msg->msg.hdr.len << 2, + msg->hdr.len << 2, &actual_length, 1000); } static int esd_usb_wait_msg(struct esd_usb *dev, - struct esd_usb_msg *msg) + union esd_usb_msg *msg) { int actual_length; @@ -630,7 +628,7 @@ static int esd_usb_start(struct esd_usb_net_priv *priv) { struct esd_usb *dev = priv->usb; struct net_device *netdev = priv->netdev; - struct esd_usb_msg *msg; + union esd_usb_msg *msg; int err, i; msg = kmalloc(sizeof(*msg), GFP_KERNEL); @@ -651,14 +649,14 @@ static int esd_usb_start(struct esd_usb_net_priv *priv) * the number of the starting bitmask (0..64) to the filter.option * field followed by only some bitmasks. */ - 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 */ + msg->hdr.cmd = CMD_IDADD; + msg->hdr.len = 2 + ESD_MAX_ID_SEGMENT; + msg->filter.net = priv->index; + msg->filter.option = ESD_ID_ENABLE; /* start with segment 0 */ for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) - msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); + msg->filter.mask[i] = cpu_to_le32(0xffffffff); /* enable 29bit extended IDs */ - msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); + msg->filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); err = esd_usb_send_msg(dev, msg); if (err) @@ -734,12 +732,12 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, struct esd_tx_urb_context *context = NULL; struct net_device_stats *stats = &netdev->stats; struct can_frame *cf = (struct can_frame *)skb->data; - struct esd_usb_msg *msg; + union esd_usb_msg *msg; struct urb *urb; u8 *buf; int i, err; int ret = NETDEV_TX_OK; - size_t size = sizeof(struct esd_usb_msg); + size_t size = sizeof(union esd_usb_msg); if (can_dev_dropped_skb(netdev, skb)) return NETDEV_TX_OK; @@ -761,24 +759,24 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, goto nobufmem; } - msg = (struct esd_usb_msg *)buf; + msg = (union esd_usb_msg *)buf; - msg->msg.hdr.len = 3; /* minimal length */ - msg->msg.hdr.cmd = CMD_CAN_TX; - msg->msg.tx.net = priv->index; - msg->msg.tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); - msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); + msg->hdr.len = 3; /* minimal length */ + msg->hdr.cmd = CMD_CAN_TX; + msg->tx.net = priv->index; + msg->tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); + msg->tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); if (cf->can_id & CAN_RTR_FLAG) - msg->msg.tx.dlc |= ESD_RTR; + msg->tx.dlc |= ESD_RTR; if (cf->can_id & CAN_EFF_FLAG) - msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); + msg->tx.id |= cpu_to_le32(ESD_EXTID); for (i = 0; i < cf->len; i++) - msg->msg.tx.data[i] = cf->data[i]; + msg->tx.data[i] = cf->data[i]; - msg->msg.hdr.len += (cf->len + 3) >> 2; + msg->hdr.len += (cf->len + 3) >> 2; for (i = 0; i < MAX_TX_URBS; i++) { if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { @@ -798,10 +796,10 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, context->echo_index = i; /* hnd must not be 0 - MSB is stripped in txdone handling */ - msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ + msg->tx.hnd = 0x80000000 | i; /* returned in TX done message */ usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, - msg->msg.hdr.len << 2, + msg->hdr.len << 2, esd_usb_write_bulk_callback, context); urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; @@ -855,7 +853,7 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, static int esd_usb_close(struct net_device *netdev) { struct esd_usb_net_priv *priv = netdev_priv(netdev); - struct esd_usb_msg *msg; + union esd_usb_msg *msg; int i; msg = kmalloc(sizeof(*msg), GFP_KERNEL); @@ -863,21 +861,21 @@ static int esd_usb_close(struct net_device *netdev) return -ENOMEM; /* Disable all IDs (see esd_usb_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 */ + msg->hdr.cmd = CMD_IDADD; + msg->hdr.len = 2 + ESD_MAX_ID_SEGMENT; + msg->filter.net = priv->index; + 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; + msg->filter.mask[i] = 0; if (esd_usb_send_msg(priv->usb, msg) < 0) netdev_err(netdev, "sending idadd message failed\n"); /* 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_USB_NO_BAUDRATE); + msg->hdr.len = 2; + msg->hdr.cmd = CMD_SETBAUD; + msg->setbaud.net = priv->index; + msg->setbaud.rsvd = 0; + msg->setbaud.baud = cpu_to_le32(ESD_USB_NO_BAUDRATE); if (esd_usb_send_msg(priv->usb, msg) < 0) netdev_err(netdev, "sending setbaud message failed\n"); @@ -919,7 +917,7 @@ static int esd_usb2_set_bittiming(struct net_device *netdev) { struct esd_usb_net_priv *priv = netdev_priv(netdev); struct can_bittiming *bt = &priv->can.bittiming; - struct esd_usb_msg *msg; + union esd_usb_msg *msg; int err; u32 canbtr; int sjw_shift; @@ -950,11 +948,11 @@ static int esd_usb2_set_bittiming(struct net_device *netdev) if (!msg) return -ENOMEM; - 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(canbtr); + msg->hdr.len = 2; + msg->hdr.cmd = CMD_SETBAUD; + msg->setbaud.net = priv->index; + msg->setbaud.rsvd = 0; + msg->setbaud.baud = cpu_to_le32(canbtr); netdev_info(netdev, "setting BTR=%#x\n", canbtr); @@ -1065,7 +1063,7 @@ static int esd_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { struct esd_usb *dev; - struct esd_usb_msg *msg; + union esd_usb_msg *msg; int i, err; dev = kzalloc(sizeof(*dev), GFP_KERNEL); @@ -1087,11 +1085,11 @@ static int esd_usb_probe(struct usb_interface *intf, } /* 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; + msg->hdr.cmd = CMD_VERSION; + msg->hdr.len = 2; + msg->version.rsvd = 0; + msg->version.flags = 0; + msg->version.drv_version = 0; err = esd_usb_send_msg(dev, msg); if (err < 0) { @@ -1105,8 +1103,8 @@ static int esd_usb_probe(struct usb_interface *intf, goto free_msg; } - dev->net_count = (int)msg->msg.version_reply.nets; - dev->version = le32_to_cpu(msg->msg.version_reply.version); + dev->net_count = (int)msg->version_reply.nets; + dev->version = le32_to_cpu(msg->version_reply.version); if (device_create_file(&intf->dev, &dev_attr_firmware)) dev_err(&intf->dev, base-commit: 6ad172748db49deef0da9038d29019aedf991a7e -- 2.25.1
