From: Andre Przywara <andre.przywara@arm.com>
To: "David S . Miller" <davem@davemloft.net>,
Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>,
Robert Hancock <hancock@sedsystems.ca>,
netdev@vger.kernel.org,
Russell King <rmk+kernel@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Andrew Lunn <andrew@lunn.ch>
Subject: [PATCH v3 05/14] net: axienet: Improve DMA error handling
Date: Tue, 24 Mar 2020 13:23:38 +0000 [thread overview]
Message-ID: <20200324132347.23709-6-andre.przywara@arm.com> (raw)
In-Reply-To: <20200324132347.23709-1-andre.przywara@arm.com>
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>
---
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 415179cbdc51..82ec7deacdfe 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -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),
--
2.17.1
next prev parent reply other threads:[~2020-03-24 13:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 13:23 [PATCH v3 00/14] net: axienet: Update error handling and add 64-bit DMA support Andre Przywara
2020-03-24 13:23 ` [PATCH v3 01/14] net: xilinx: temac: Relax Kconfig dependencies Andre Przywara
2020-03-24 13:23 ` [PATCH v3 02/14] net: axienet: Convert DMA error handler to a work queue Andre Przywara
2020-03-24 13:23 ` [PATCH v3 03/14] net: axienet: Propagate failure of DMA descriptor setup Andre Przywara
2020-03-24 13:23 ` [PATCH v3 04/14] net: axienet: Fix DMA descriptor cleanup path Andre Przywara
2020-03-24 13:23 ` Andre Przywara [this message]
2020-03-24 13:23 ` [PATCH v3 06/14] net: axienet: Factor out TX descriptor chain cleanup Andre Przywara
2020-03-24 13:23 ` [PATCH v3 07/14] net: axienet: Check for DMA mapping errors Andre Przywara
2020-03-24 13:23 ` [PATCH v3 08/14] net: axienet: Mark eth_irq as optional Andre Przywara
2020-03-24 13:23 ` [PATCH v3 09/14] net: axienet: Drop MDIO interrupt registers from ethtools dump Andre Przywara
2020-03-24 13:23 ` [PATCH v3 10/14] net: axienet: Add mii-tool support Andre Przywara
2020-03-24 13:43 ` Andrew Lunn
2020-03-24 13:23 ` [PATCH v3 11/14] net: axienet: Wrap DMA pointer writes to prepare for 64 bit Andre Przywara
2020-03-24 13:23 ` [PATCH v3 12/14] net: axienet: Upgrade descriptors to hold 64-bit addresses Andre Przywara
2020-03-24 13:23 ` [PATCH v3 13/14] net: axienet: Autodetect 64-bit DMA capability Andre Przywara
2020-03-24 13:23 ` [PATCH v3 14/14] net: axienet: Allow DMA to beyond 4GB Andre Przywara
2020-03-24 23:33 ` [PATCH v3 00/14] net: axienet: Update error handling and add 64-bit DMA support David Miller
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