tree 439950fcc64c69e480acf89cdce11ca785f0a633
parent 3f0307b0d2d8b333a6964fc4c820dc86896fd1cf
author Brian King <brking@linux.vnet.ibm.com> 1563226910 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1564904012 +0200

bnx2x: Prevent load reordering in tx completion processing

[ Upstream commit ea811b795df24644a8eb760b493c43fba4450677 ]

This patch fixes an issue seen on Power systems with bnx2x which results
in the skb is NULL WARN_ON in bnx2x_free_tx_pkt firing due to the skb
pointer getting loaded in bnx2x_free_tx_pkt prior to the hw_cons
load in bnx2x_tx_int. Adding a read memory barrier resolves the issue.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>