This is a note to let you know that I've just added the patch titled
vmbus: fix missing signaling in hv_signal_on_read()
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vmbus-fix-missing-signaling-in-hv_signal_on_read.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From decui@xxxxxxxxxxxxx Tue Oct 24 14:15:52 2017
From: Dexuan Cui <decui@xxxxxxxxxxxxx>
Date: Thu, 19 Oct 2017 18:07:35 +0000
Subject: vmbus: fix missing signaling in hv_signal_on_read()
To: "gregkh@xxxxxxxxxxxxxxxxxxx" <gregkh@xxxxxxxxxxxxxxxxxxx>, "stable@xxxxxxxxxxxxxxx" <stable@xxxxxxxxxxxxxxx>
Cc: KY Srinivasan <kys@xxxxxxxxxxxxx>, Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Message-ID: <KL1P15301MB00062D18DE80DE90B4116AB4BF420@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
From: Dexuan Cui <decui@xxxxxxxxxxxxx>
[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@xxxxxxxxxxxxx>
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Hi Greg, as we discussed, I'm resending this patch, and please only apply
it to linux-4.9.y (i.e. v4.9.57 as of today).
include/linux/hyperv.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1521,11 +1521,11 @@ static inline void hv_signal_on_read(st
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;
Patches currently in stable-queue which might be from decui@xxxxxxxxxxxxx are
queue-4.9/vmbus-fix-missing-signaling-in-hv_signal_on_read.patch