[PATCH] vmbus: fix missing signaling in hv_signal_on_read()

Stephen Hemminger
2017-08-16T15:49:59Z

When the space available before start of reading (cached_write_sz)
is the same as the host required space (pending_sz), we need to
still signal host.

Fixes: 433e19cf33d3 ("Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()")

Signed-off-by: John Starks <jon.Starks@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
This patch is for 4.13 (and stable).
A different fix is needed for linux-next.

include/linux/hyperv.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index e09fc8290c2f..080a0797c6f3 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1515,11 +1515,11 @@ static inline void hv_signal_on_read(struct vmbus_channel *channel)

cur_write_sz = hv_get_bytes_to_write(rbi);

- if (cur_write_sz < pending_sz)
+ if (cur_write_sz <= pending_sz)
return;

cached_write_sz = hv_get_cached_bytes_to_write(rbi);
- if (cached_write_sz < pending_sz)
+ if (cached_write_sz <= pending_sz)
vmbus_setevent(channel);
}

--
2.11.0