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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-kernel@vger.kernel.org, intel-wired-lan@lists.osuosl.org, Aleksandr Loktionov , Rinitha S , Michal Schmidt , Jacob Keller Subject: [PATCH net v6 1/2] dpll: export __dpll_pin_change_ntf() for use under dpll_lock Date: Thu, 16 Apr 2026 13:39:51 +0200 Message-ID: <20260416113952.389405-2-poros@redhat.com> In-Reply-To: <20260416113952.389405-1-poros@redhat.com> References: <20260416113952.389405-1-poros@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 From: Ivan Vecera Export __dpll_pin_change_ntf() so that drivers can send pin change notifications from within pin callbacks, which are already called under dpll_lock. Using dpll_pin_change_ntf() in that context would deadlock. Add lockdep_assert_held() to catch misuse without the lock held. Signed-off-by: Ivan Vecera Signed-off-by: Petr Oros --- drivers/dpll/dpll_netlink.c | 10 ++++++++++ drivers/dpll/dpll_netlink.h | 2 -- include/linux/dpll.h | 1 + 3 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 83cbd64abf5a47..95ae786e98aab3 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -842,11 +842,21 @@ int dpll_pin_delete_ntf(struct dpll_pin *pin) return dpll_pin_event_send(DPLL_CMD_PIN_DELETE_NTF, pin); } +/** + * __dpll_pin_change_ntf - notify that the pin has been changed + * @pin: registered pin pointer + * + * Context: caller must hold dpll_lock. Suitable for use inside pin + * callbacks which are already invoked under dpll_lock. + * Return: 0 if succeeds, error code otherwise. + */ int __dpll_pin_change_ntf(struct dpll_pin *pin) { + lockdep_assert_held(&dpll_lock); dpll_pin_notify(pin, DPLL_PIN_CHANGED); return dpll_pin_event_send(DPLL_CMD_PIN_CHANGE_NTF, pin); } +EXPORT_SYMBOL_GPL(__dpll_pin_change_ntf); /** * dpll_pin_change_ntf - notify that the pin has been changed diff --git a/drivers/dpll/dpll_netlink.h b/drivers/dpll/dpll_netlink.h index dd28b56d27c56d..a9cfd55f57fc42 100644 --- a/drivers/dpll/dpll_netlink.h +++ b/drivers/dpll/dpll_netlink.h @@ -11,5 +11,3 @@ int dpll_device_delete_ntf(struct dpll_device *dpll); int dpll_pin_create_ntf(struct dpll_pin *pin); int dpll_pin_delete_ntf(struct dpll_pin *pin); - -int __dpll_pin_change_ntf(struct dpll_pin *pin); diff --git a/include/linux/dpll.h b/include/linux/dpll.h index 2ce295b46b8cdc..8f97120ee7b37d 100644 --- a/include/linux/dpll.h +++ b/include/linux/dpll.h @@ -276,6 +276,7 @@ int dpll_pin_ref_sync_pair_add(struct dpll_pin *pin, int dpll_device_change_ntf(struct dpll_device *dpll); +int __dpll_pin_change_ntf(struct dpll_pin *pin); int dpll_pin_change_ntf(struct dpll_pin *pin); int register_dpll_notifier(struct notifier_block *nb); -- 2.52.0