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Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code 

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@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2014-07-07 16:34:24 -07:00 committed by Greg Kroah-Hartman
parent 57b30c333f
commit 17256c6385
1 changed files with 6 additions and 2 deletions
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8
drivers/hv/connection.c
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@ -304,9 +304,13 @@ 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);