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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Saucy)
   Importance: High
     Assignee: Joseph Salisbury (jsalisbury)
       Status: In Progress

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https://bugs.launchpad.net/bugs/1200243

Title:
  Network lock up Windows Azure/Hyper-V

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Saucy:
  In Progress
Status in Gentoo Linux:
  New

Bug description:
  Netwokring on Windows Azure 13.10 instance just lock up. After
  diagnosis, it appears that the root cause is networking. MS reports
  that OpenSUSE 12.3 had the same problem and was patched via:

  
  Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
  Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
  Reported-by: Olaf Hering <olh@xxxxxxx>

  Cc: Stable <stable@xxxxxxxxxxxxxxx>  (V3.8+)
  ---
   drivers/hv/ring_buffer.c |    1 +
   1 files changed, 1 insertions(+), 0 deletions(-)
  diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
  index cafa72f..d6fbb577 100644
  --- a/drivers/hv/ring_buffer.c
  +++ b/drivers/hv/ring_buffer.c
  @@ -71,6 +71,7 @@ u32 hv_end_read(struct hv_ring_buffer_info *rbi)
   
   static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi)
   {
  +	smp_mb();
   	if (rbi->ring_buffer->interrupt_mask)
   		return false;

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