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clk: Fix clk_hw_get_clk() when dev is NULL

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Any registered clk_core structure can have a NULL pointer in its dev
field. While never actually documented, this is evidenced by the wide
usage of clk_register and clk_hw_register with a NULL device pointer,
and the fact that the core of_clk_hw_register() function also passes a
NULL device pointer.

A call to clk_hw_get_clk() on a clk_hw struct whose clk_core is in that
case will result in a NULL pointer derefence when it calls dev_name() on
that NULL device pointer.

Add a test for this case and use NULL as the dev_id if the device
pointer is NULL.

Fixes: 30d6f8c15d ("clk: add api to get clk consumer from clk_hw")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-2-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Maxime Ripard 2022-02-25 15:35:23 +01:00 committed by Stephen Boyd
parent a992acbb21
commit 0c1b56df45
1 changed files with 2 additions and 1 deletions
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3
drivers/clk/clk.c
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@ -3773,8 +3773,9 @@ struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
struct clk *clk_hw_get_clk(struct clk_hw *hw, const char *con_id)
{
struct device *dev = hw->core->dev;
const char *name = dev ? dev_name(dev) : NULL;
return clk_hw_create_clk(dev, hw, dev_name(dev), con_id);
return clk_hw_create_clk(dev, hw, name, con_id);
}
EXPORT_SYMBOL(clk_hw_get_clk);