[PATCH] hv: use substraction to update ring buffer index

[Dan Carpenter]

On Thu, Jan 05, 2017 at 02:39:55PM +0300, Dan Carpenter wrote:
> > @@ -179,7 +180,8 @@ static u32 hv_copyfrom_ringbuffer(
> >  	memcpy(dest, ring_buffer + start_read_offset, destlen);
> >  
> >  	start_read_offset += destlen;
> > -	start_read_offset %= ring_buffer_size;
> > +	if (start_read_offset >= ring_buffer_size)
> > +		start_read_offset -= ring_buffer_size;
> 
> I totally don't understand the original code here.  We do the memset

I meant memcpy() not memset.

regards,
dan carpenter