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net: axienet: Improve DMA error handling

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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@arm.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andre Przywara 2020-03-24 13:23:38 +00:00 committed by David S. Miller
parent f26667a373
commit e7fea0b9d0
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
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@ -571,7 +571,7 @@ 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;
@ -1539,7 +1539,7 @@ 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),