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authorStephen Hemminger <stephen@networkplumber.org>2017-06-25 22:30:27 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-17 18:16:05 +0300
commit05d00bc94ac27d220d8a78e365d7fa3a26dcca17 (patch)
tree64da1c51e2148467c6b9a3acb71ab113510d42ad /drivers/hv/ring_buffer.c
parent8dd45f2ab005a1f3301296059b23b03ec3dbf79b (diff)
downloadlinux-05d00bc94ac27d220d8a78e365d7fa3a26dcca17.tar.xz
vmbus: eliminate duplicate cached index
Don't need cached read index anymore now that packet iterator is used. The iterator has the original read index until the visible read_index is updated. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/ring_buffer.c')
-rw-r--r--drivers/hv/ring_buffer.c17
1 files changed, 4 insertions, 13 deletions
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index a9021f13379f..b0f79526b86a 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -358,9 +358,6 @@ struct vmpacket_descriptor *hv_pkt_iter_first(struct vmbus_channel *channel)
{
struct hv_ring_buffer_info *rbi = &channel->inbound;
- /* set state for later hv_pkt_iter_close */
- rbi->cached_read_index = rbi->ring_buffer->read_index;
-
if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor))
return NULL;
@@ -388,10 +385,7 @@ __hv_pkt_iter_next(struct vmbus_channel *channel,
rbi->priv_read_index -= dsize;
/* more data? */
- if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor))
- return NULL;
- else
- return hv_get_ring_buffer(rbi) + rbi->priv_read_index;
+ return hv_pkt_iter_first(channel);
}
EXPORT_SYMBOL_GPL(__hv_pkt_iter_next);
@@ -401,7 +395,7 @@ EXPORT_SYMBOL_GPL(__hv_pkt_iter_next);
void hv_pkt_iter_close(struct vmbus_channel *channel)
{
struct hv_ring_buffer_info *rbi = &channel->inbound;
- u32 cur_write_sz, cached_write_sz;
+ u32 orig_write_sz = hv_get_bytes_to_write(rbi);
u32 pending_sz;
/*
@@ -430,13 +424,10 @@ void hv_pkt_iter_close(struct vmbus_channel *channel)
if (pending_sz == 0)
return;
- cur_write_sz = hv_get_bytes_to_write(rbi);
-
- if (cur_write_sz < pending_sz)
+ if (hv_get_bytes_to_write(rbi) < pending_sz)
return;
- cached_write_sz = hv_get_cached_bytes_to_write(rbi);
- if (cached_write_sz < pending_sz)
+ if (orig_write_sz < pending_sz)
vmbus_setevent(channel);
}
EXPORT_SYMBOL_GPL(hv_pkt_iter_close);