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Currently, __clk_core_init() allows failure of the kcalloc() for the
core->parents. So, clk_fetch_parent_index() and __clk_init_parent()
also try to allocate core->parents in case it has not been allocated
yet. Scattering memory allocation here and there makes things
complicated.
Like other clk_core members, allocate core->parents in clk_register()
and let it fail in case of memory shortage. If we cannot allocate
such a small piece of memory, the system is already insane. There is
no point to postpone the memory allocation.
Also, allocate core->parents regardless of core->num_parents. We want
it even if core->num_parents == 1 because clk_fetch_parent_index()
might be called against the clk_core with a single parent.
If core->num_parents == 0, core->parents is set to ZERO_SIZE_PTR. It
is harmless because no access happens to core->parents in such a case.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
176d11690b