4.9-stable review patch. If anyone has any objections, please let me know.
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From: Anssi Hannula anssi.hannula@bitwise.fi
commit 2574fe54515ed3487405de329e4e9f13d7098c10 upstream.
The xilinx_can driver performs a software reset when an RX overrun is detected. This causes the device to enter Configuration mode where no messages are received or transmitted.
The documentation does not mention any need to perform a reset on an RX overrun, and testing by inducing an RX overflow also indicated that the device continues to work just fine without a reset.
Remove the software reset.
Tested with the integrated CAN on Zynq-7000 SoC.
Fixes: b1201e44f50b ("can: xilinx CAN controller support") Signed-off-by: Anssi Hannula anssi.hannula@bitwise.fi Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/can/xilinx_can.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/net/can/xilinx_can.c +++ b/drivers/net/can/xilinx_can.c @@ -696,7 +696,6 @@ static void xcan_err_interrupt(struct ne if (isr & XCAN_IXR_RXOFLW_MASK) { stats->rx_over_errors++; stats->rx_errors++; - priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_RESET_MASK); if (skb) { cf->can_id |= CAN_ERR_CRTL; cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;