Thread (65 messages) flat view 65 messages, 6 authors, 2020-04-29

RE: [PATCH 04/14] net: axienet: Improve DMA error handling

From: Radhey Shyam Pandey <hidden>
Date: 2020-01-10 15:26:13
Also in: linux-arm-kernel, lkml

-----Original Message-----
From: Andre Przywara <andre.przywara@arm.com>
Sent: Friday, January 10, 2020 5:24 PM
To: David S . Miller <davem@davemloft.net>; Radhey Shyam Pandey
[off-list ref]
Cc: Michal Simek <redacted>; Robert Hancock
[off-list ref]; netdev@vger.kernel.org; linux-arm-
kernel@lists.infradead.org; linux-kernel@vger.kernel.org
Subject: [PATCH 04/14] net: axienet: Improve DMA error handling

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 <redacted>
quoted hunk ↗ jump to hunk
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 7e90044cf2d9..ec5d01adc1d5 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -570,7 +570,7 @@ 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;
@@ -1557,7 +1557,7 @@ static void axienet_dma_err_handler(unsigned
long data)

 	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),
--
2.17.1
  
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