xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

amd-xgbe: Add a read memory barrier to Tx/Rx path

Browse Source 
Add a read memory barrier to the Tx and Rx paths where the ownership
bit is checked to be sure that all descriptor fields are read after
having read the ownership bit for the descriptor.

This has not been an issue to date, but it's a good safe-guard to have.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas
2014-11-20 11:03:26 -06:00
committed by David S. Miller
parent 91ecee6846
commit 5449e27167
2 changed files with 7 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/amd/xgbe/xgbe-dev.c
View File

@@ -1558,6 +1558,9 @@ static int xgbe_dev_read(struct xgbe_channel *channel)
if (XGMAC_GET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, OWN))
return 1;
/* Make sure descriptor fields are read after reading the OWN bit */
rmb();
#ifdef XGMAC_ENABLE_RX_DESC_DUMP
xgbe_dump_rx_desc(ring, rdesc, ring->cur);
#endif