From: Alexandre Belloni alexandre.belloni@bootlin.com
[ Upstream commit e6a41c23df0d5da01540d2abef41591589c0b4be ]
Because of autosuspend, at91ether_start is called with clocks disabled. Ensure that pm_runtime doesn't suspend the interface as soon as it is opened as there is no pm_runtime support is the other relevant parts of the platform support for at91rm9200.
Fixes: d54f89af6cc4 ("net: macb: Add pm runtime support") Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Reviewed-by: Claudiu Beznea claudiu.beznea@microchip.com Acked-by: Nicolas Ferre nicolas.ferre@microchip.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/cadence/macb_main.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -3690,6 +3690,10 @@ static int at91ether_open(struct net_dev u32 ctl; int ret;
+ ret = pm_runtime_get_sync(&lp->pdev->dev); + if (ret < 0) + return ret; + /* Clear internal statistics */ ctl = macb_readl(lp, NCR); macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT)); @@ -3750,7 +3754,7 @@ static int at91ether_close(struct net_de q->rx_buffers, q->rx_buffers_dma); q->rx_buffers = NULL;
- return 0; + return pm_runtime_put(&lp->pdev->dev); }
/* Transmit packet */