[PATCH] pmdomain: arm: scmi: Fix genpd leak on provider registration failure

[Peng Fan]

> Subject: [PATCH] pmdomain: arm: scmi: Fix genpd leak on provider
> registration failure
> 
> If of_genpd_add_provider_onecell() fails during probe, the previously
> created generic power domains are not removed, leading to a memory
> leak and potential kernel crash later in genpd_debug_add().
> 
> Add proper error handling to unwind the initialized domains before
> returning from probe to ensure all resources are correctly released on
> failure.
> 
> Example crash trace observed without this fix:
> 
>   | Unable to handle kernel paging request at virtual address
> fffffffffffffc70
>   | CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-rc1 #405
> PREEMPT
>   | Hardware name: ARM LTD ARM Juno Development Platform/ARM
> Juno Development Platform
>   | pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>   | pc : genpd_debug_add+0x2c/0x160
>   | lr : genpd_debug_init+0x74/0x98
>   | Call trace:
>   |  genpd_debug_add+0x2c/0x160 (P)
>   |  genpd_debug_init+0x74/0x98
>   |  do_one_initcall+0xd0/0x2d8
>   |  do_initcall_level+0xa0/0x140
>   |  do_initcalls+0x60/0xa8
>   |  do_basic_setup+0x28/0x40
>   |  kernel_init_freeable+0xe8/0x170
>   |  kernel_init+0x2c/0x140
>   |  ret_from_fork+0x10/0x20
> 
> Fixes: 898216c97ed2 ("firmware: arm_scmi: add device power domain
> support using genpd")
> Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>

Reviewed-by: Peng Fan <peng.fan at nxp.com>