diff options
| author | Stephen Hemminger <stephen@networkplumber.org> | 2017-06-25 12:30:27 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-17 17:16:05 +0200 |
| commit | 05d00bc94ac27d220d8a78e365d7fa3a26dcca17 (patch) | |
| tree | 64da1c51e2148467c6b9a3acb71ab113510d42ad | |
| parent | 8dd45f2ab005a1f3301296059b23b03ec3dbf79b (diff) | |
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>
| -rw-r--r-- | drivers/hv/ring_buffer.c | 17 | ||||
| -rw-r--r-- | include/linux/hyperv.h | 14 |
2 files changed, 4 insertions, 27 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); diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 308e1f9706bb..27db4e650b8c 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -125,7 +125,6 @@ struct hv_ring_buffer_info { u32 ring_datasize; /* < ring_size */ u32 priv_read_index; - u32 cached_read_index; }; /* @@ -178,19 +177,6 @@ static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi) return write; } -static inline u32 hv_get_cached_bytes_to_write( - const struct hv_ring_buffer_info *rbi) -{ - u32 read_loc, write_loc, dsize, write; - - dsize = rbi->ring_datasize; - read_loc = rbi->cached_read_index; - write_loc = rbi->ring_buffer->write_index; - - write = write_loc >= read_loc ? dsize - (write_loc - read_loc) : - read_loc - write_loc; - return write; -} /* * VMBUS version is 32 bit entity broken up into * two 16 bit quantities: major_number. minor_number. |