Re: [PATCH] clk: amlogic: fix recent code refactoring

[Neil Armstrong <neil.armstrong@linaro.org>]

On 18/09/2025 18:06, Marek Szyprowski wrote:
> Commit 4c4e17f27013 ("clk: amlogic: naming consistency alignment")
> refactored some internals in the g12a meson clock driver. Unfortunately
> it introduced a bug in the clock init data, which results in the
> following kernel panic:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
> Mem abort info:
> ...
> Data abort info:
> ...
> [0000000000000000] user address but active_mm is swapper
> Internal error: Oops: 0000000096000004 [#1]  SMP
> Modules linked in:
> CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc1+ #11158 PREEMPT
> Hardware name: Hardkernel ODROID-N2 (DT)
> pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : __clk_register+0x60/0x92c
> lr : __clk_register+0x48/0x92c
> ...
> Call trace:
>   __clk_register+0x60/0x92c (P)
>   devm_clk_hw_register+0x5c/0xd8
>   meson_eeclkc_probe+0x74/0x110
>   g12a_clkc_probe+0x2c/0x58
>   platform_probe+0x5c/0xac
>   really_probe+0xbc/0x298
>   __driver_probe_device+0x78/0x12c
>   driver_probe_device+0xdc/0x164
>   __driver_attach+0x9c/0x1ac
>   bus_for_each_dev+0x74/0xd0
>   driver_attach+0x24/0x30
>   bus_add_driver+0xe4/0x208
>   driver_register+0x60/0x128
>   __platform_driver_register+0x24/0x30
>   g12a_clkc_driver_init+0x1c/0x28
>   do_one_initcall+0x64/0x308
>   kernel_init_freeable+0x27c/0x4f8
>   kernel_init+0x20/0x1d8
>   ret_from_fork+0x10/0x20
> Code: 52800038 aa0003fc b9010018 52819801 (f9400260)
> ---[ end trace 0000000000000000 ]---
> 
> Fix this by correcting the clock init data.
> 
> Fixes: 4c4e17f27013 ("clk: amlogic: naming consistency alignment")
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>   drivers/clk/meson/g12a.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c
> index 7e2c0ce91964..1413eadd8dc6 100644
> --- a/drivers/clk/meson/g12a.c
> +++ b/drivers/clk/meson/g12a.c
> @@ -4919,7 +4919,7 @@ static struct clk_hw *g12b_hw_clks[] = {
>   	[CLKID_CPUB_CLK_DYN0_SEL]	= &g12b_cpub_clk_dyn0_sel.hw,
>   	[CLKID_CPUB_CLK_DYN0_DIV]	= &g12b_cpub_clk_dyn0_div.hw,
>   	[CLKID_CPUB_CLK_DYN0]		= &g12b_cpub_clk_dyn0.hw,
> -	[CLKID_CPUB_CLK_DYN1_SEL]	= &g12b_cpub_clk_dyn1.hw,
> +	[CLKID_CPUB_CLK_DYN1_SEL]	= &g12b_cpub_clk_dyn1_sel.hw,
>   	[CLKID_CPUB_CLK_DYN1_DIV]	= &g12b_cpub_clk_dyn1_div.hw,
>   	[CLKID_CPUB_CLK_DYN1]		= &g12b_cpub_clk_dyn1.hw,
>   	[CLKID_CPUB_CLK_DYN]		= &g12b_cpub_clk_dyn.hw,

Thanks for the fix!

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on BananPi M2S