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vmbus: fix missing signaling in hv_signal_on_read()

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[Fixes upstream in a much larger set of patches that are not worth backporting
to 4.9 - gregkh]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dexuan Cui 2017-10-19 18:07:35 +00:00 committed by Greg Kroah-Hartman
parent 1c33c8f8a7
commit 13c5e97701
1 changed files with 2 additions and 2 deletions
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4
include/linux/hyperv.h
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@ -1521,11 +1521,11 @@ 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);
return;