netdev - [patch net] dpll: fix dpll_xa_ref_*_del() for multiple registrations

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Message-ID: <20240306151240.1464884-1-jiri@resnulli.us>
Date: Wed,  6 Mar 2024 16:12:40 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: arkadiusz.kubalewski@...el.com,
	vadim.fedorenko@...ux.dev,
	milena.olech@...el.com,
	rrameshbabu@...dia.com
Subject: [patch net] dpll: fix dpll_xa_ref_*_del() for multiple registrations

From: Jiri Pirko <jiri@...dia.com>

Currently, if there are multiple registrations of the same pin on the
same dpll device, following warnings are observed:
WARNING: CPU: 5 PID: 2212 at drivers/dpll/dpll_core.c:143 dpll_xa_ref_pin_del.isra.0+0x21e/0x230
WARNING: CPU: 5 PID: 2212 at drivers/dpll/dpll_core.c:223 __dpll_pin_unregister+0x2b3/0x2c0

The problem is, that in both dpll_xa_ref_dpll_del() and
dpll_xa_ref_pin_del() registration is only removed from list in case the
reference count drops to zero. That is wrong, the registration has to
be removed always.

To fix this, remove the registration from the list and free
it unconditionally, instead of doing it only when the ref reference
counter reaches zero.

Fixes: 9431063ad323 ("dpll: core: Add DPLL framework base functions")
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 drivers/dpll/dpll_core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
index 7f686d179fc9..c751a87c7a8e 100644
--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c
@@ -129,9 +129,9 @@ static int dpll_xa_ref_pin_del(struct xarray *xa_pins, struct dpll_pin *pin,
 		reg = dpll_pin_registration_find(ref, ops, priv);
 		if (WARN_ON(!reg))
 			return -EINVAL;
+		list_del(&reg->list);
+		kfree(reg);
 		if (refcount_dec_and_test(&ref->refcount)) {
-			list_del(&reg->list);
-			kfree(reg);
 			xa_erase(xa_pins, i);
 			WARN_ON(!list_empty(&ref->registration_list));
 			kfree(ref);
@@ -209,9 +209,9 @@ dpll_xa_ref_dpll_del(struct xarray *xa_dplls, struct dpll_device *dpll,
 		reg = dpll_pin_registration_find(ref, ops, priv);
 		if (WARN_ON(!reg))
 			return;
+		list_del(&reg->list);
+		kfree(reg);
 		if (refcount_dec_and_test(&ref->refcount)) {
-			list_del(&reg->list);
-			kfree(reg);
 			xa_erase(xa_dplls, i);
 			WARN_ON(!list_empty(&ref->registration_list));
 			kfree(ref);
-- 
2.43.2