A more comprehensive fix has been submitted upstream, but in the
meantime, we'd like the first fix to be considered for inclusion in
Wily.
The more comprehensive change is a 7-part series submitted Mar 23 in
lkml, and uses full memory barrier before making signaling decisions:
"Drivers: hv: vmbus: Cleanup the ring buffer code"
Cleanup and fix a bug in the ring buffer code. Also implement
APIs for in place consumption of received packets.
K. Y. Srinivasan (7):
Drivers: hv: vmbus: Introduce functions for estimating room in the
ring buffer
Drivers: hv: vmbus: Use READ_ONCE() to read variables that are
volatile
Drivers: hv: vmbus: Fix a bug in hv_need_to_signal_on_read()
Drivers: hv: vmbus: Use the new virt_xx barrier code
Drivers: hv: vmbus: Export the vmbus_set_event() API
Drivers: hv: vmbus: Move some ring buffer functions to hyperv.h
Drivers: hv: vmbus: Implement APIs to support "in place" consumption
of vmbus packets
drivers/hv/connection.c | 1 +
drivers/hv/hyperv_vmbus.h | 2 -
drivers/hv/ring_buffer.c | 79 ++++-------------------
include/linux/hyperv.h | 156 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 169 insertions(+), 69 deletions(-)
We will test this new change and respond to upstream feedback. The first
fix in this bug works for our mutual customers at the moment.
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https://bugs.launchpad.net/bugs/1556264
Title:
[Hyper-V] vmbus: Fix a bug in hv_need_to_signal_on_read()
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