platform/x86/intel: power-domains: Handle failed init in tpmi_get_power_domain_mask()

tpmi_init() returns early on CPU models that are not in tpmi_cpu_ids,
before tpmi_power_domain_mask is allocated. When the driver is built
in, the exported tpmi_get_power_domain_mask() remains callable after
the failed init. It returns NULL then only because it indexes the NULL
array at offset 0 for the zeroed per-CPU data. If cpuhp_setup_state()
fails, the error path frees the array but leaves the pointer set, so
the helper would return a pointer into freed memory.

Nothing in the tree calls tpmi_get_power_domain_mask() today, so this
is hardening rather than a fix for a reachable bug. Return NULL when
the array was not allocated, and clear the pointer wherever it is
freed, as the previous patch does for domain_die_map.

Assisted-by: LLM
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20260924193625.1830526-3-kristen.c.accardi@intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

0 files changed, 0 insertions, 0 deletions