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Date: Wed, 16 Aug 2017 08:49:46 -0700 From: Stephen Hemminger <stephen@...workplumber.org> To: kys@...rosoft.com, decui@...rosoft.com Cc: devel@...uxdriverproject.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org, Stephen Hemminger <sthemmin@...rosoft.com>, John Starks <jon.Starks@...rosoft.com> Subject: [PATCH] vmbus: fix missing signaling in hv_signal_on_read() 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@...rosoft.com> Signed-off-by: Dexuan Cui <decui@...rosoft.com> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.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
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