[U-Boot] stm32: stm32_flash: add memory barrier during flash write

[Tom Rini]

On Mon, Apr 04, 2016 at 04:49:02PM -0700, Vikas Manocha wrote:

> After writing data to flash space, next instruction is checking if flash
> controller is busy writing to the flash memory. Memory barrier is required here
> to avoid transaction re-ordering for data write and busy status check.
> 
> Signed-off-by: Vikas Manocha <vikas.manocha at st.com>

Applied to u-boot/master, thanks!

-- 
Tom
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