[U-Boot] [U-Boot, v2] ti: clocks: Fix do_enable_clocks() to accept NULL pointers as input parameters

[Tom Rini]

On Mon, Mar 27, 2017 at 10:15:27AM +0200, Lukasz Majewski wrote:

> Up till this commit passing NULL as input parameter was allowed, but not
> handled properly.
> 
> When one passed NULL to one of this function parameters, the code was
> executed causing data abort.
> 
> However, what is more interesting, the abort was not caught because of code
> execution in HYP mode with masked CPSR A bit ("Imprecise Data Abort mask bit).
> The TI's AM57xx SoC switch to HYP mode with A bit masked in lowlevel_init.S
> due to SMC call. Such operation (by default) is performed in SoC ROM code.
> 
> The problem would pop up when one:
> - Switch back to SVC mode after disabling LPAE support
> - Somebody enables A bit (by executing cpsie a asm instruction)
> 
> and then the previously described exception would be caught.
> 
> Signed-off-by: Lukasz Majewski <lukma at denx.de>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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