[PATCH] clk: Check parent for NULL in clk_change_rate

On 20120608-14:04, Pawel Moll wrote:

clk_change_rate() is accessing parent's rate without checking
if the parent exists at all. In case of root clocks this will
cause NULL pointer dereference.

This patch follows what clk_calc_new_rates() does in such
situation.

Signed-off-by: Pawel Moll <redacted>

Pawel,

This problem is indeed a real one.  I've taken your patch into clk-next
for testing.

Thanks much,
Mike