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clk: Don't dereference parent clock if is NULL

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The clock passed as an argument to clk_mux_determine_rate_flags()
has the CLK_SET_RATE_PARENT flag set but it has no parent, then a
NULL pointer will tried to be dereferenced.

This shouldn't happen since setting that flag for a clock with no
parent is a bug but the core should be robust to handle that case.

Fixes: 035a61c314 ("clk: Make clk API return per-user struct clk instances")
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
This commit is contained in:
Javier Martinez Canillas 2015-02-12 14:58:28 +01:00 committed by Michael Turquette
parent 69b59cb817
commit 9e0ad7d28a
1 changed files with 2 additions and 2 deletions
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4
drivers/clk/clk.c
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@ -800,8 +800,8 @@ clk_mux_determine_rate_flags(struct clk_hw *hw, unsigned long rate,
if (core->flags & CLK_SET_RATE_NO_REPARENT) {
parent = core->parent;
if (core->flags & CLK_SET_RATE_PARENT)
best = __clk_determine_rate(parent->hw, rate,
min_rate, max_rate);
best = __clk_determine_rate(parent ? parent->hw : NULL,
rate, min_rate, max_rate);
else if (parent)
best = clk_core_get_rate_nolock(parent);
else