[PATCH] i2c: omap: ensure writes to dev->buf_len are ordered

[Paul Walmsley]

On Sat, 27 Oct 2012, Santosh Shilimkar wrote:

> Another alternative, which I will recommend to just make use of the
> read*/wrire* instead __raw versions. The barriers are taken care
> already and driver point of view, it is transparent.

Those barriers will disappear if CONFIG_ARM_DMA_MEM_BUFFERABLE is set to 
N, so that's probably not the right thing to do in this case.  The barrier 
here isn't DMA-related, it's needed due to the design of the driver.

In fact the wmb() is probably overkill, since only a compiler reordering 
barrier is needed.  It can probably just be barrier().


- Paul