AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-17 22:06:41 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

stmmac: Fix for nfs hang on multiple reboot

Browse Source 
It was observed that during multiple reboots nfs hangs. The status of
receive descriptors shows that all the descriptors were in control of
CPU, and none were assigned to DMA.
Also the DMA status register confirmed that the Rx buffer is
unavailable.

This patch adds the fix for the same by adding the memory barriers to
ascertain that the all instructions before enabling the Rx or Tx DMA are
completed which involves the proper setting of the ownership bit in DMA
descriptors.

Signed-off-by: Deepak Sikri <deepak.sikri@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Deepak Sikri 2012-07-08 21:14:45 +00:00 committed by David S. Miller
parent c1109736bc
commit 8e83989106
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -1212,6 +1212,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion);
wmb();
priv->hw->desc->set_tx_owner(desc);
wmb();
}
/* Interrupt on completition only for the latest segment */
@ -1227,6 +1228,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
/* To avoid raise condition */
priv->hw->desc->set_tx_owner(first);
wmb();
priv->cur_tx++;
@ -1290,6 +1292,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv)
}
wmb();
priv->hw->desc->set_rx_owner(p + entry);
wmb();
}
}