The current code polls the RX desciptor ring for new packets by reading the RX descriptor status. This works by accident, as the RX descriptors are often in non-cacheable memory. However, the driver does support use of RX descriptors in cacheable memory.
This patch adds a missing RX descriptor invalidation, which assures the CPU will read a fresh copy of the RX descriptor instead of a cached one. Signed-off-by: Marek Vasut <[email protected]> Cc: Joe Hershberger <[email protected]> Cc: Patrice Chotard <[email protected]> Cc: Patrick Delaunay <[email protected]> Cc: Ramon Fried <[email protected]> Cc: Stephen Warren <[email protected]> --- drivers/net/dwc_eth_qos.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c index 66cc301c8c..e40c461278 100644 --- a/drivers/net/dwc_eth_qos.c +++ b/drivers/net/dwc_eth_qos.c @@ -1397,6 +1397,7 @@ static int eqos_recv(struct udevice *dev, int flags, uchar **packetp) debug("%s(dev=%p, flags=%x):\n", __func__, dev, flags); rx_desc = &(eqos->rx_descs[eqos->rx_desc_idx]); + eqos->config->ops->eqos_inval_desc(rx_desc); if (rx_desc->des3 & EQOS_DESC3_OWN) { debug("%s: RX packet not available\n", __func__); return -EAGAIN; -- 2.25.1
