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

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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>
Cc: <stable@vger.kernel.org>
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 a497c3ba1d
commit affb1aff30
1 changed files with 6 additions and 2 deletions
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8
drivers/hv/connection.c
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@ -339,9 +339,13 @@ 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);