diff options
| author | Marek Vasut <marex@denx.de> | 2020-03-23 04:11:46 +0300 |
|---|---|---|
| committer | marex <marex@desktop.lan> | 2020-05-01 13:35:21 +0300 |
| commit | 24891dd8d40d71c034023d2a037c97df1714393b (patch) | |
| tree | 9902469951873d9d0455f4e26e1f63dbe872cd91 /drivers/net/dwc_eth_qos.c | |
| parent | a83ca0c280dd41dda576d6a8f15a8534a84b782c (diff) | |
| download | u-boot-24891dd8d40d71c034023d2a037c97df1714393b.tar.xz | |
net: dwc_eth_qos: Prevent DMA from writing updated RX DMA descriptor
The DMA may attempt to write a DMA descriptor in the ring while it is
being updated. By writing the DMA descriptor buffer address to 0, it
is assured the DMA will not use such a buffer and the buffer can be
updated without any interference.
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Cc: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/net/dwc_eth_qos.c')
| -rw-r--r-- | drivers/net/dwc_eth_qos.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c index a195fe5c27..60dfd17a74 100644 --- a/drivers/net/dwc_eth_qos.c +++ b/drivers/net/dwc_eth_qos.c @@ -1477,8 +1477,10 @@ static int eqos_free_pkt(struct udevice *dev, uchar *packet, int length) rx_desc = &(eqos->rx_descs[eqos->rx_desc_idx]); + rx_desc->des0 = 0; + mb(); + eqos->config->ops->eqos_flush_desc(rx_desc); eqos->config->ops->eqos_inval_buffer(packet, length); - rx_desc->des0 = (u32)(ulong)packet; rx_desc->des1 = 0; rx_desc->des2 = 0; |