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[176.3.40.35]) by smtp.gmail.com with UTF8SMTPSA id a640c23a62f3a-ad18914736asm449923366b.7.2025.05.05.01.01.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 May 2025 01:01:30 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: multipart/signed; boundary=64453a89ddc6afb76b4932a46c59c202600130e560186a7d832de92cee9b; micalg=pgp-sha512; protocol="application/pgp-signature" Date: Mon, 05 May 2025 10:01:22 +0200 Message-Id: From: "Markus Schneider-Pargmann" To: "Marc Kleine-Budde" , "Manivannan Sadhasivam" , "Thomas Kopp" , "Vincent Mailhol" , , "Heiko Stuebner" , "Chandrasekar Ramakrishnan" Cc: , , , , Subject: Re: [PATCH 3/3] can: mcan: m_can_class_unregister: fix order of unregistration calls X-Mailer: aerc 0.20.1 References: <20250502-can-rx-offload-del-v1-0-59a9b131589d@pengutronix.de> <20250502-can-rx-offload-del-v1-3-59a9b131589d@pengutronix.de> In-Reply-To: <20250502-can-rx-offload-del-v1-3-59a9b131589d@pengutronix.de> --64453a89ddc6afb76b4932a46c59c202600130e560186a7d832de92cee9b Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Fri May 2, 2025 at 4:13 PM CEST, Marc Kleine-Budde wrote: > If a driver is removed, the driver framework invokes the driver's > remove callback. A CAN driver's remove function calls > unregister_candev(), which calls net_device_ops::ndo_stop further down > in the call stack for interfaces which are in the "up" state. > > The removal of the module causes the a warning, as > can_rx_offload_del() deletes the NAPI, while it is still active, > because the interface is still up. > > To fix the warning, first unregister the network interface, which > calls net_device_ops::ndo_stop, which disables the NAPI, and then call > can_rx_offload_del(). > > Fixes: 1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to e= nsure skbs are sent from softirq context") > Cc: stable@vger.kernel.org > Signed-off-by: Marc Kleine-Budde Reviewed-by: Markus Schneider-Pargmann > --- > drivers/net/can/m_can/m_can.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.= c > index 884a6352c42b..7c430eaff5dd 100644 > --- a/drivers/net/can/m_can/m_can.c > +++ b/drivers/net/can/m_can/m_can.c > @@ -2462,9 +2462,9 @@ EXPORT_SYMBOL_GPL(m_can_class_register); > =20 > void m_can_class_unregister(struct m_can_classdev *cdev) > { > + unregister_candev(cdev->net); > if (cdev->is_peripheral) > can_rx_offload_del(&cdev->offload); > - unregister_candev(cdev->net); > } > EXPORT_SYMBOL_GPL(m_can_class_unregister); > =20 --64453a89ddc6afb76b4932a46c59c202600130e560186a7d832de92cee9b Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iIcEABYKAC8WIQSJYVVm/x+5xmOiprOFwVZpkBVKUwUCaBhwUhEcbXNwQGJheWxp YnJlLmNvbQAKCRCFwVZpkBVKU3urAQCJ69IFypvaFtVZN9A3KA4EhHPYFZnLhKhP Pk2HK1dA9AEAlZm7/1uU/TAuxXN+0/6NZUVxbJO2yOQNMI6MhbuvGwY= =/3qK -----END PGP SIGNATURE----- --64453a89ddc6afb76b4932a46c59c202600130e560186a7d832de92cee9b--