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Date: Mon, 7 Jul 2014 16:34:24 -0700 From: "K. Y. Srinivasan" <kys@...rosoft.com> To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com, jasowang@...hat.com Cc: "K. Y. Srinivasan" <kys@...rosoft.com>, <stable@...r.kernel.org> Subject: [PATCH 1/2] Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code 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@...rosoft.com> Cc: <stable@...r.kernel.org> --- drivers/hv/connection.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index e84f452..ae22e3c 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -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); -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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