This is a note to let you know that I've just added the patch titled
net: axienet: Improve DMA error handling
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-axienet-improve-dma-error-handling.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6d9c4bcc73d77d8bbaef9024fb3ada12a759e596
Author: Andre Przywara <andre.przywara@xxxxxxx>
Date: Tue Mar 24 13:23:38 2020 +0000
net: axienet: Improve DMA error handling
[ Upstream commit e7fea0b9d09e2f7d32776f5198192dfc2572a5b9 ]
Since 0 is a valid DMA address, we cannot use the physical address to
check whether a TX descriptor is valid and is holding a DMA mapping.
Use the "cntrl" member of the descriptor to make this decision, as it
contains at least the length of the buffer, so 0 points to an
uninitialised buffer.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 9ff2f816e2aa ("net: axienet: Fix register defines comment description")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 27901bb7cd5b5..22222d79e4902 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -572,7 +572,7 @@ static void axienet_start_xmit_done(struct net_device *ndev)
DMA_TO_DEVICE);
if (cur_p->skb)
dev_consume_skb_irq(cur_p->skb);
- /*cur_p->phys = 0;*/
+ cur_p->cntrl = 0;
cur_p->app0 = 0;
cur_p->app1 = 0;
cur_p->app2 = 0;
@@ -1562,7 +1562,7 @@ static void axienet_dma_err_handler(struct work_struct *work)
for (i = 0; i < lp->tx_bd_num; i++) {
cur_p = &lp->tx_bd_v[i];
- if (cur_p->phys)
+ if (cur_p->cntrl)
dma_unmap_single(ndev->dev.parent, cur_p->phys,
(cur_p->cntrl &
XAXIDMA_BD_CTRL_LENGTH_MASK),
