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

sungem, sunhme, sunvnet: Update drivers to use dma_wmb/rmb

Browse Source 
This patch goes through and replaces wmb/rmb with dma_wmb/dma_rmb in cases
where the barrier is being used to order writes or reads to just memory and
doesn't involve any programmed I/O.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2015-04-07 16:55:14 -07:00
committed by David S. Miller
parent 04abac5fd6
commit b4468cc6f2
3 changed files with 18 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/sun/sunvnet.c
View File

@@ -519,7 +519,7 @@ static int vnet_walk_rx_one(struct vnet_port *port,
if (desc->hdr.state != VIO_DESC_READY)
return 1;
rmb();
dma_rmb();
viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
desc->hdr.state, desc->hdr.ack,
@@ -1380,7 +1380,7 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* This has to be a non-SMP write barrier because we are writing
* to memory which is shared with the peer LDOM.
*/
wmb();
dma_wmb();
d->hdr.state = VIO_DESC_READY;
@@ -1395,7 +1395,7 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
* is marked READY, but start_cons was false.
* If so, vnet_ack() should send out the missed "start" trigger.
*
* Note that the wmb() above makes sure the cookies et al. are
* Note that the dma_wmb() above makes sure the cookies et al. are
* not globally visible before the VIO_DESC_READY, and that the
* stores are ordered correctly by the compiler. The consumer will
* not proceed until the VIO_DESC_READY is visible assuring that