can: c_can: Handle state change correctly

If the allocation of an error skb fails, the state change handling
returns w/o doing any work. That leaves the interface in a wreckaged
state as the internal status is wrong.

Split the interface handling and the skb handling.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 6038761..246bcf9 100644 (file)
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -914,6 +914,26 @@ static int c_can_handle_state_change(struct net_device *dev,
        struct sk_buff *skb;
        struct can_berr_counter bec;
 
+       switch (error_type) {
+       case C_CAN_ERROR_WARNING:
+               /* error warning state */
+               priv->can.can_stats.error_warning++;
+               priv->can.state = CAN_STATE_ERROR_WARNING;
+               break;
+       case C_CAN_ERROR_PASSIVE:
+               /* error passive state */
+               priv->can.can_stats.error_passive++;
+               priv->can.state = CAN_STATE_ERROR_PASSIVE;
+               break;
+       case C_CAN_BUS_OFF:
+               /* bus-off state */
+               priv->can.state = CAN_STATE_BUS_OFF;
+               can_bus_off(dev);
+               break;
+       default:
+               break;
+       }
+
        /* propagate the error condition to the CAN stack */
        skb = alloc_can_err_skb(dev, &cf);
        if (unlikely(!skb))
@@ -927,8 +947,6 @@ static int c_can_handle_state_change(struct net_device *dev,
        switch (error_type) {
        case C_CAN_ERROR_WARNING:
                /* error warning state */
-               priv->can.can_stats.error_warning++;
-               priv->can.state = CAN_STATE_ERROR_WARNING;
                cf->can_id |= CAN_ERR_CRTL;
                cf->data[1] = (bec.txerr > bec.rxerr) ?
                        CAN_ERR_CRTL_TX_WARNING :
@@ -939,8 +957,6 @@ static int c_can_handle_state_change(struct net_device *dev,
                break;
        case C_CAN_ERROR_PASSIVE:
                /* error passive state */
-               priv->can.can_stats.error_passive++;
-               priv->can.state = CAN_STATE_ERROR_PASSIVE;
                cf->can_id |= CAN_ERR_CRTL;
                if (rx_err_passive)
                        cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
@@ -952,7 +968,6 @@ static int c_can_handle_state_change(struct net_device *dev,
                break;
        case C_CAN_BUS_OFF:
                /* bus-off state */
-               priv->can.state = CAN_STATE_BUS_OFF;
                cf->can_id |= CAN_ERR_BUSOFF;
                can_bus_off(dev);
                break;