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authorRobert Hancock <robert.hancock@calian.com>2022-01-19 00:41:29 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-01-27 12:54:32 +0300
commit6301f3566aef4e8e8ad6019e43ddb95ad6f65fc6 (patch)
tree9ef312900b3ded32e7aa558175faa32c13b2f578
parent7a3d3d7f6d7b3db6cabeb9d43ef207c3eda1b8a5 (diff)
downloadlinux-6301f3566aef4e8e8ad6019e43ddb95ad6f65fc6.tar.xz
net: axienet: Fix TX ring slot available check
commit 996defd7f8b5dafc1d480b7585c7c62437f80c3c upstream. The check for whether a TX ring slot was available was incorrect, since a slot which had been loaded with transmit data but the device had not started transmitting would be treated as available, potentially causing non-transmitted slots to be overwritten. The control field in the descriptor should be checked, rather than the status field (which may only be updated when the device completes the entry). Fixes: 8a3b7a252dca9 ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver") Signed-off-by: Robert Hancock <robert.hancock@calian.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/ethernet/xilinx/xilinx_axienet_main.c4
1 files 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 acfd7d545fef..94e39750932c 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -643,7 +643,6 @@ static int axienet_free_tx_chain(struct net_device *ndev, u32 first_bd,
if (cur_p->skb && (status & XAXIDMA_BD_STS_COMPLETE_MASK))
dev_consume_skb_irq(cur_p->skb);
- cur_p->cntrl = 0;
cur_p->app0 = 0;
cur_p->app1 = 0;
cur_p->app2 = 0;
@@ -651,6 +650,7 @@ static int axienet_free_tx_chain(struct net_device *ndev, u32 first_bd,
cur_p->skb = NULL;
/* ensure our transmit path and device don't prematurely see status cleared */
wmb();
+ cur_p->cntrl = 0;
cur_p->status = 0;
if (sizep)
@@ -713,7 +713,7 @@ static inline int axienet_check_tx_bd_space(struct axienet_local *lp,
/* Ensure we see all descriptor updates from device or TX IRQ path */
rmb();
cur_p = &lp->tx_bd_v[(lp->tx_bd_tail + num_frag) % lp->tx_bd_num];
- if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK)
+ if (cur_p->cntrl)
return NETDEV_TX_BUSY;
return 0;
}