dpll: check that pin is registered in __dpll_pin_unregister()

[ Upstream commit 9736c64 ]

Similar to what is done in dpll_device_unregister(), add assertion to
__dpll_pin_unregister() to make sure driver does not try to unregister
non-registered pin.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Link: https://lore.kernel.org/r/20240206074853.345744-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 38d7b94 ("dpll: fix dpll_pin_on_pin_register() for multiple parent pins")
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Jiri Pirko

drivers/dpll/dpll_core.c

@@ -29,6 +29,8 @@ static u32 dpll_pin_xa_id;
 	WARN_ON_ONCE(!xa_get_mark(&dpll_device_xa, (d)->id, DPLL_REGISTERED))
 #define ASSERT_DPLL_NOT_REGISTERED(d)	\
 	WARN_ON_ONCE(xa_get_mark(&dpll_device_xa, (d)->id, DPLL_REGISTERED))
+#define ASSERT_DPLL_PIN_REGISTERED(p) \
+	WARN_ON_ONCE(!xa_get_mark(&dpll_pin_xa, (p)->id, DPLL_REGISTERED))
 
 struct dpll_device_registration {
 	struct list_head list;
@@ -651,6 +653,7 @@ static void
 __dpll_pin_unregister(struct dpll_device *dpll, struct dpll_pin *pin,
 		      const struct dpll_pin_ops *ops, void *priv)
 {
+	ASSERT_DPLL_PIN_REGISTERED(pin);
 	dpll_xa_ref_pin_del(&dpll->pin_refs, pin, ops, priv);
 	dpll_xa_ref_dpll_del(&pin->dpll_refs, dpll, ops, priv);
 	if (xa_empty(&pin->dpll_refs))