From: Ahmed S. Darwish Date: Mon, 26 Jan 2015 05:27:19 +0000 (+0200) Subject: can: kvaser_usb: Update interface state before exiting on OOM X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3b07a444ee48a8081d2ed3f0abeeabd038404ac1;p=linux-beck.git can: kvaser_usb: Update interface state before exiting on OOM Update all of the can interface's state and error counters before trying any skb allocation that can actually fail with -ENOMEM. Suggested-by: Marc Kleine-Budde Signed-off-by: Ahmed S. Darwish Acked-by: Andri Yngvason Signed-off-by: Marc Kleine-Budde --- diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c index 7af379ca861b..f57ce556c678 100644 --- a/drivers/net/can/usb/kvaser_usb.c +++ b/drivers/net/can/usb/kvaser_usb.c @@ -273,6 +273,10 @@ struct kvaser_msg { } u; } __packed; +struct kvaser_usb_error_summary { + u8 channel, status, txerr, rxerr, error_factor; +}; + struct kvaser_usb_tx_urb_context { struct kvaser_usb_net_priv *priv; u32 echo_index; @@ -615,6 +619,54 @@ static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv) priv->tx_contexts[i].echo_index = MAX_TX_URBS; } +static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv, + const struct kvaser_usb_error_summary *es) +{ + struct net_device_stats *stats; + enum can_state new_state; + + stats = &priv->netdev->stats; + new_state = priv->can.state; + + netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status); + + if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) { + priv->can.can_stats.bus_off++; + new_state = CAN_STATE_BUS_OFF; + } else if (es->status & M16C_STATE_BUS_PASSIVE) { + if (priv->can.state != CAN_STATE_ERROR_PASSIVE) + priv->can.can_stats.error_passive++; + new_state = CAN_STATE_ERROR_PASSIVE; + } else if (es->status & M16C_STATE_BUS_ERROR) { + if ((priv->can.state < CAN_STATE_ERROR_WARNING) && + ((es->txerr >= 96) || (es->rxerr >= 96))) { + priv->can.can_stats.error_warning++; + new_state = CAN_STATE_ERROR_WARNING; + } else if ((priv->can.state > CAN_STATE_ERROR_ACTIVE) && + ((es->txerr < 96) && (es->rxerr < 96))) { + new_state = CAN_STATE_ERROR_ACTIVE; + } + } + + if (!es->status) + new_state = CAN_STATE_ERROR_ACTIVE; + + if (priv->can.restart_ms && + (priv->can.state >= CAN_STATE_BUS_OFF) && + (new_state < CAN_STATE_BUS_OFF)) { + priv->can.can_stats.restarts++; + } + + if (es->error_factor) { + priv->can.can_stats.bus_error++; + stats->rx_errors++; + } + + priv->bec.txerr = es->txerr; + priv->bec.rxerr = es->rxerr; + priv->can.state = new_state; +} + static void kvaser_usb_rx_error(const struct kvaser_usb *dev, const struct kvaser_msg *msg) { @@ -622,30 +674,30 @@ static void kvaser_usb_rx_error(const struct kvaser_usb *dev, struct sk_buff *skb; struct net_device_stats *stats; struct kvaser_usb_net_priv *priv; - unsigned int new_state; - u8 channel, status, txerr, rxerr, error_factor; + struct kvaser_usb_error_summary es = { }; + enum can_state old_state; switch (msg->id) { case CMD_CAN_ERROR_EVENT: - channel = msg->u.error_event.channel; - status = msg->u.error_event.status; - txerr = msg->u.error_event.tx_errors_count; - rxerr = msg->u.error_event.rx_errors_count; - error_factor = msg->u.error_event.error_factor; + es.channel = msg->u.error_event.channel; + es.status = msg->u.error_event.status; + es.txerr = msg->u.error_event.tx_errors_count; + es.rxerr = msg->u.error_event.rx_errors_count; + es.error_factor = msg->u.error_event.error_factor; break; case CMD_LOG_MESSAGE: - channel = msg->u.log_message.channel; - status = msg->u.log_message.data[0]; - txerr = msg->u.log_message.data[2]; - rxerr = msg->u.log_message.data[3]; - error_factor = msg->u.log_message.data[1]; + es.channel = msg->u.log_message.channel; + es.status = msg->u.log_message.data[0]; + es.txerr = msg->u.log_message.data[2]; + es.rxerr = msg->u.log_message.data[3]; + es.error_factor = msg->u.log_message.data[1]; break; case CMD_CHIP_STATE_EVENT: - channel = msg->u.chip_state_event.channel; - status = msg->u.chip_state_event.status; - txerr = msg->u.chip_state_event.tx_errors_count; - rxerr = msg->u.chip_state_event.rx_errors_count; - error_factor = 0; + es.channel = msg->u.chip_state_event.channel; + es.status = msg->u.chip_state_event.status; + es.txerr = msg->u.chip_state_event.tx_errors_count; + es.rxerr = msg->u.chip_state_event.rx_errors_count; + es.error_factor = 0; break; default: dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n", @@ -653,116 +705,93 @@ static void kvaser_usb_rx_error(const struct kvaser_usb *dev, return; } - if (channel >= dev->nchannels) { + if (es.channel >= dev->nchannels) { dev_err(dev->udev->dev.parent, - "Invalid channel number (%d)\n", channel); + "Invalid channel number (%d)\n", es.channel); return; } - priv = dev->nets[channel]; + priv = dev->nets[es.channel]; stats = &priv->netdev->stats; + /* Update all of the can interface's state and error counters before + * trying any skb allocation that can actually fail with -ENOMEM. + */ + old_state = priv->can.state; + kvaser_usb_rx_error_update_can_state(priv, &es); + skb = alloc_can_err_skb(priv->netdev, &cf); if (!skb) { stats->rx_dropped++; return; } - new_state = priv->can.state; - - netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status); - - if (status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) { + if (es.status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) { cf->can_id |= CAN_ERR_BUSOFF; - priv->can.can_stats.bus_off++; if (!priv->can.restart_ms) kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP); - netif_carrier_off(priv->netdev); - - new_state = CAN_STATE_BUS_OFF; - } else if (status & M16C_STATE_BUS_PASSIVE) { - if (priv->can.state != CAN_STATE_ERROR_PASSIVE) { + } else if (es.status & M16C_STATE_BUS_PASSIVE) { + if (old_state != CAN_STATE_ERROR_PASSIVE) { cf->can_id |= CAN_ERR_CRTL; - if (txerr || rxerr) - cf->data[1] = (txerr > rxerr) + if (es.txerr || es.rxerr) + cf->data[1] = (es.txerr > es.rxerr) ? CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE; else cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE | CAN_ERR_CRTL_RX_PASSIVE; - - priv->can.can_stats.error_passive++; } - - new_state = CAN_STATE_ERROR_PASSIVE; - } else if (status & M16C_STATE_BUS_ERROR) { - if ((priv->can.state < CAN_STATE_ERROR_WARNING) && - ((txerr >= 96) || (rxerr >= 96))) { + } else if (es.status & M16C_STATE_BUS_ERROR) { + if ((old_state < CAN_STATE_ERROR_WARNING) && + ((es.txerr >= 96) || (es.rxerr >= 96))) { cf->can_id |= CAN_ERR_CRTL; - cf->data[1] = (txerr > rxerr) + cf->data[1] = (es.txerr > es.rxerr) ? CAN_ERR_CRTL_TX_WARNING : CAN_ERR_CRTL_RX_WARNING; - - priv->can.can_stats.error_warning++; - new_state = CAN_STATE_ERROR_WARNING; - } else if ((priv->can.state > CAN_STATE_ERROR_ACTIVE) && - ((txerr < 96) && (rxerr < 96))) { + } else if ((old_state > CAN_STATE_ERROR_ACTIVE) && + ((es.txerr < 96) && (es.rxerr < 96))) { cf->can_id |= CAN_ERR_PROT; cf->data[2] = CAN_ERR_PROT_ACTIVE; - - new_state = CAN_STATE_ERROR_ACTIVE; } } - if (!status) { + if (!es.status) { cf->can_id |= CAN_ERR_PROT; cf->data[2] = CAN_ERR_PROT_ACTIVE; - - new_state = CAN_STATE_ERROR_ACTIVE; } if (priv->can.restart_ms && - (priv->can.state >= CAN_STATE_BUS_OFF) && - (new_state < CAN_STATE_BUS_OFF)) { + (old_state >= CAN_STATE_BUS_OFF) && + (priv->can.state < CAN_STATE_BUS_OFF)) { cf->can_id |= CAN_ERR_RESTARTED; netif_carrier_on(priv->netdev); - - priv->can.can_stats.restarts++; } - if (error_factor) { - priv->can.can_stats.bus_error++; - stats->rx_errors++; - + if (es.error_factor) { cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT; - if (error_factor & M16C_EF_ACKE) + if (es.error_factor & M16C_EF_ACKE) cf->data[3] |= (CAN_ERR_PROT_LOC_ACK); - if (error_factor & M16C_EF_CRCE) + if (es.error_factor & M16C_EF_CRCE) cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ | CAN_ERR_PROT_LOC_CRC_DEL); - if (error_factor & M16C_EF_FORME) + if (es.error_factor & M16C_EF_FORME) cf->data[2] |= CAN_ERR_PROT_FORM; - if (error_factor & M16C_EF_STFE) + if (es.error_factor & M16C_EF_STFE) cf->data[2] |= CAN_ERR_PROT_STUFF; - if (error_factor & M16C_EF_BITE0) + if (es.error_factor & M16C_EF_BITE0) cf->data[2] |= CAN_ERR_PROT_BIT0; - if (error_factor & M16C_EF_BITE1) + if (es.error_factor & M16C_EF_BITE1) cf->data[2] |= CAN_ERR_PROT_BIT1; - if (error_factor & M16C_EF_TRE) + if (es.error_factor & M16C_EF_TRE) cf->data[2] |= CAN_ERR_PROT_TX; } - cf->data[6] = txerr; - cf->data[7] = rxerr; - - priv->bec.txerr = txerr; - priv->bec.rxerr = rxerr; - - priv->can.state = new_state; + cf->data[6] = es.txerr; + cf->data[7] = es.rxerr; stats->rx_packets++; stats->rx_bytes += cf->can_dlc; @@ -786,6 +815,9 @@ static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv, } if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) { + stats->rx_over_errors++; + stats->rx_errors++; + skb = alloc_can_err_skb(priv->netdev, &cf); if (!skb) { stats->rx_dropped++; @@ -795,9 +827,6 @@ static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv, cf->can_id |= CAN_ERR_CRTL; cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; - stats->rx_over_errors++; - stats->rx_errors++; - stats->rx_packets++; stats->rx_bytes += cf->can_dlc; netif_rx(skb);