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can: xilinx_can: only report warning and passive states on state changes 

The xilinx_can driver currently increments error-warning and
error-passive statistics on every error interrupt regardless of whether
the interface was already in the same state. Similarly, the error frame
sent on error interrupts is always sent with
CAN_ERR_CRTL_(RX|TX)_(PASSIVE|WARNING) bit set.

To make the error-warning and error-passive statistics more useful, add
a check to only set the error state when the state has actually been
changed.

Tested with the integrated CAN on Zynq-7000 SoC.

Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Anssi Hannula 2017-02-08 13:32:43 +02:00 committed by Marc Kleine-Budde
parent c8d4dea2a8
commit 7e2804aae1
1 changed files with 2 additions and 1 deletions
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3
drivers/net/can/xilinx_can.c
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@ -703,7 +703,8 @@ static void xcan_err_interrupt(struct net_device *ndev, u32 isr)
} else {
enum can_state new_state = xcan_current_error_state(ndev);
xcan_set_error_state(ndev, new_state, skb ? cf : NULL);
if (new_state != priv->can.state)
xcan_set_error_state(ndev, new_state, skb ? cf : NULL);
}
/* Check for Arbitration lost interrupt */