From 738ee270fe17ea9e48fee8823eb356ed03656e7c Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Mon, 23 Mar 2020 02:09:21 +0100 Subject: [PATCH] net: dwc_eth_qos: Invalidate RX descriptor before reading 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. Reviewed-by: Patrick Delaunay Signed-off-by: Marek Vasut Cc: Joe Hershberger Cc: Patrice Chotard Cc: Patrick Delaunay Cc: Ramon Fried Cc: Stephen Warren --- 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 e33f3045fe..2b37cc3cde 100644 --- a/drivers/net/dwc_eth_qos.c +++ b/drivers/net/dwc_eth_qos.c @@ -1443,6 +1443,7 @@ 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; -- 2.39.5