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Sun, 04 May 2025 11:54:39 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-can@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: multipart/signed; boundary=a2be36fb501c3dfa35a1012a0204bfd7cc7ee65d88753afd76602dbef972; micalg=pgp-sha512; protocol="application/pgp-signature" Date: Sun, 04 May 2025 20:54:27 +0200 Message-Id: Cc: , , , , , Subject: Re: [PATCH v3] can: m_can: initialize spin lock on device probe From: "Markus Schneider-Pargmann" To: "Antonios Salios" , X-Mailer: aerc 0.20.1 References: <20250425111744.37604-2-antonios@mwa.re> In-Reply-To: <20250425111744.37604-2-antonios@mwa.re> --a2be36fb501c3dfa35a1012a0204bfd7cc7ee65d88753afd76602dbef972 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Hi, On Fri Apr 25, 2025 at 1:17 PM CEST, Antonios Salios wrote: > The spin lock tx_handling_spinlock in struct m_can_classdev is not being > initialized. This leads the following spinlock bad magic complaint from t= he > kernel, eg. when trying to send CAN frames with cansend from can-utils: > > [ 10.631450] BUG: spinlock bad magic on CPU#0, cansend/95 > [ 10.631462] lock: 0xff60000002ec1010, .magic: 00000000, .owner: /-1, .owner_cpu: 0 > [ 10.631479] CPU: 0 UID: 0 PID: 95 Comm: cansend Not tainted 6.15.0-rc3= -00032-ga79be02bba5c #5 NONE > [ 10.631487] Hardware name: MachineWare SIM-V (DT) > [ 10.631490] Call Trace: > [ 10.631493] [] dump_backtrace+0x1c/0x24 > [ 10.631503] [] show_stack+0x28/0x34 > [ 10.631510] [] dump_stack_lvl+0x4a/0x68 > [ 10.631518] [] dump_stack+0x14/0x1c > [ 10.631526] [] spin_dump+0x62/0x6e > [ 10.631534] [] do_raw_spin_lock+0xd0/0x142 > [ 10.631542] [] _raw_spin_lock_irqsave+0x20/0x2c > [ 10.631554] [] m_can_start_xmit+0x90/0x34a > [ 10.631567] [] dev_hard_start_xmit+0xa6/0xee > [ 10.631577] [] sch_direct_xmit+0x114/0x292 > [ 10.631586] [] __dev_queue_xmit+0x3b0/0xaa8 > [ 10.631596] [] can_send+0xc6/0x242 > [ 10.631604] [] raw_sendmsg+0x1a8/0x36c > [ 10.631612] [] sock_write_iter+0x9a/0xee > [ 10.631623] [] vfs_write+0x184/0x3a6 > [ 10.631633] [] ksys_write+0xa0/0xc0 > [ 10.631643] [] __riscv_sys_write+0x14/0x1c > [ 10.631654] [] do_trap_ecall_u+0x168/0x212 > [ 10.631662] [] handle_exception+0x146/0x152 > > Initializing the spin lock in m_can_class_allocate_dev solves that > problem. > > Fixes: 1fa80e23c150 ("can: m_can: Introduce a tx_fifo_in_flight counter") > > Signed-off-by: Antonios Salios > Reviewed-by: Vincent Mailhol Thanks for finding and fixing this. Reviewed-by: Markus Schneider-Pargmann Best Markus > --- > Changes since v2: > * Clarify bug in commit message > > Changes since v1: > * Move spin_lock_init from device probe functions to classdev alloc func= tion > * Add a fixes tag > --- > drivers/net/can/m_can/m_can.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.= c > index 884a6352c..12e313998 100644 > --- a/drivers/net/can/m_can/m_can.c > +++ b/drivers/net/can/m_can/m_can.c > @@ -2379,6 +2379,8 @@ struct m_can_classdev *m_can_class_allocate_dev(str= uct device *dev, > SET_NETDEV_DEV(net_dev, dev); > =20 > m_can_of_parse_mram(class_dev, mram_config_vals); > + > + spin_lock_init(&class_dev->tx_handling_spinlock); > out: > return class_dev; > } --a2be36fb501c3dfa35a1012a0204bfd7cc7ee65d88753afd76602dbef972 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iIcEABYKAC8WIQSJYVVm/x+5xmOiprOFwVZpkBVKUwUCaBe34xEcbXNwQGJheWxp YnJlLmNvbQAKCRCFwVZpkBVKU89GAQDr3jtUGj6D1oEty/ukeBy81LKZK/2B/h9L 59c4zdDlggD9G78Y8FCOVpLAFNjVySknxhREhi53v9mLu3NI3DYzBgs= =TsUr -----END PGP SIGNATURE----- --a2be36fb501c3dfa35a1012a0204bfd7cc7ee65d88753afd76602dbef972--