On Wed, Mar 23, 2016 at 05:53:53PM -0700, K. Y. Srinivasan wrote: > We need to issue a full memory barrier prior making a signalling decision. > > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > 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 2919395..67dc245 100644 > --- a/drivers/hv/ring_buffer.c > +++ b/drivers/hv/ring_buffer.c > @@ -104,6 +104,7 @@ static bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi) > u32 cur_write_sz; > u32 pending_sz; > > + mb(); And, are you sure this is correct? You better document the heck out of this, why it's here, and what it is protecting. "raw" mb() calls are really rare for good reason. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html