kernel at martin.sperl.org writes:

From: Martin Sperl <redacted>

Add missing locking to:
* bcm2835_pll_divider_on
* bcm2835_pll_divider_off
to protect the read modify write cycle for the
register access protecting both cm_ctl and a2w_ctl
registers.

s/ctl/reg/ in the commit message

bcm2835_pll_divider_set_rate() also does an RMW on cm_reg, why was it
left out?

Since the a2w reg is only modified by _on and _off, and the core holds
the prepare lock across those, I think it was already safe and doesn't
need to be mentioned here.
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