On Wed, May 11, 2022 at 12:09:11PM +0200, Bastian Krause wrote:
> NULL struct clk pointers should be treated just as the Linux kernel clk
> driver does [1]. The reasoning should also apply to the parent clk
> argument.
>
> A NULL struct clk pointer can happen for example on the Freescale i.MX6
> SABRE Smart Device Board if CONFIG_DRIVER_VIDEO_IMX_IPUV3 is disabled,
> leading to assigned-clocks IMX6QDL_CLK_LDB_DI0_SEL and
> IMX6QDL_CLK_LDB_DI1_SEL [2] being unavailable. Without this patch, the
> board hangs while setting those assigned clock configurations since [3].
>
> [1] 89ac8d7ae1cd ("clk: handle NULL struct clk gracefully")
> [2] dts/src/arm/imx6qdl-sabresd.dtsi
> [3] f5eb5fddb4 ("clk: fix of clk set defaults when dev is a clk provider")
>
> Signed-off-by: Bastian Krause <bst@xxxxxxxxxxxxxx>
> ---
> drivers/clk/clk.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
Applied, thanks
Sascha
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 8e317b4b05..efb5d4ad4a 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -230,7 +230,10 @@ int clk_set_parent(struct clk *clk, struct clk *newparent)
> {
> struct clk_hw *hw;
> int i, ret;
> - struct clk *curparent = clk_get_parent(clk);
> + struct clk *curparent;
> +
> + if (!clk || !newparent)
> + return 0;
>
> if (IS_ERR(clk))
> return PTR_ERR(clk);
> @@ -254,6 +257,8 @@ int clk_set_parent(struct clk *clk, struct clk *newparent)
> if (i == clk->num_parents)
> return -EINVAL;
>
> + curparent = clk_get_parent(clk);
> +
> if (clk->enable_count)
> clk_enable(newparent);
>
> --
> 2.30.2
>
>
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