This is a note to let you know that I've just added the patch titled
Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code
to the 3.15-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:
drivers-hv-vmbus-fix-a-bug-in-the-channel-callback-dispatch-code.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From affb1aff300ddee54df307812b38f166e8a865ef Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Mon, 7 Jul 2014 16:34:24 -0700
Subject: Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
commit affb1aff300ddee54df307812b38f166e8a865ef upstream.
Starting with Win8, we have implemented several optimizations to improve the
scalability and performance of the VMBUS transport between the Host and the
Guest. Some of the non-performance critical services cannot leverage these
optimization since they only read and process one message at a time.
Make adjustments to the callback dispatch code to account for the way
non-performance critical drivers handle reading of the channel.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/connection.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -319,9 +319,13 @@ static void process_chn_event(u32 relid)
*/
do {
- hv_begin_read(&channel->inbound);
+ if (read_state)
+ hv_begin_read(&channel->inbound);
channel->onchannel_callback(arg);
- bytes_to_read = hv_end_read(&channel->inbound);
+ if (read_state)
+ bytes_to_read = hv_end_read(&channel->inbound);
+ else
+ bytes_to_read = 0;
} while (read_state && (bytes_to_read != 0));
} else {
pr_err("no channel callback for relid - %u\n", relid);
Patches currently in stable-queue which might be from kys@xxxxxxxxxxxxx are
queue-3.15/drivers-hv-vmbus-fix-a-bug-in-the-channel-callback-dispatch-code.patch
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