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sh: clk: Fix clk_enable() to return 0 on NULL clk

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commit ff30bd6a66 upstream.

On SH, devm_clk_get_optional_enabled() fails with -EINVAL if the clock
is not found.  This happens because __devm_clk_get() assumes it can pass
a NULL clock pointer (as returned by clk_get_optional()) to the init()
function (clk_prepare_enable() in this case), while the SH
implementation of clk_enable() considers that an error.

Fix this by making the SH clk_enable() implementation return zero
instead, like the Common Clock Framework does.

Reported-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/b53e6b557b4240579933b3359dda335ff94ed5af.1675354849.git.geert+renesas@glider.be
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven
2023-02-02 17:20:55 +01:00
committed by Greg Kroah-Hartman
parent a8a1a7949d
commit 2d9a4ff1a5
1 changed files with 1 additions and 1 deletions
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2
drivers/sh/clk/core.c
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@@ -295,7 +295,7 @@ int clk_enable(struct clk *clk)
int ret; int ret;
if (!clk) if (!clk)
return -EINVAL; return 0;
spin_lock_irqsave(&clock_lock, flags); spin_lock_irqsave(&clock_lock, flags);
ret = __clk_enable(clk); ret = __clk_enable(clk);