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clk: make sure parent is not NULL in clk_fetch_parent_index()

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If parent is given with NULL, clk_fetch_parent_index() could return
a positive index value.

Currently, parent is checked by the callers of this function, but
it would be safer to do it in this function.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Masahiro Yamada 2015-12-28 19:23:08 +09:00 committed by Stephen Boyd
parent 0e8f6e499e
commit 508f884a66
1 changed files with 3 additions and 0 deletions
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3
drivers/clk/clk.c
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@ -1066,6 +1066,9 @@ static int clk_fetch_parent_index(struct clk_core *core,
{
int i;
if (!parent)
return -EINVAL;
/*
* find index of new parent clock using cached parent ptrs,
* or if not yet cached, use string name comparison and cache