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clk: Don't try to use a struct clk* after it could have been freed

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As __clk_release could call kfree on clk and then we wouldn't have a safe way
of getting the module that owns the clock.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Fixes: fcb0ee6a3d ("clk: Implement clk_unregister")
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
This commit is contained in:
Tomeu Vizoso 2014-12-02 08:54:19 +01:00 committed by Michael Turquette
parent 4afbe1760d
commit 10cdfe54da
1 changed files with 4 additions and 1 deletions
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5
drivers/clk/clk.c
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@ -2268,14 +2268,17 @@ int __clk_get(struct clk *clk)
void __clk_put(struct clk *clk)
{
struct module *owner;
if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
return;
clk_prepare_lock();
owner = clk->owner;
kref_put(&clk->ref, __clk_release);
clk_prepare_unlock();
module_put(clk->owner);
module_put(owner);
}
/*** clk rate change notifiers ***/