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Date: Thu, 14 Jul 2022 12:38:03 +0200 From: Jiri Slaby <jirislaby@...nel.org> To: Dario Binacchi <dario.binacchi@...rulasolutions.com>, linux-kernel@...r.kernel.org Cc: lkp@...ts.01.org, Jeroen Hofstee <jhofstee@...tronenergy.com>, lkp@...el.com, kernel test robot <oliver.sang@...el.com>, Richard Palethorpe <rpalethorpe@...e.de>, Linux Memory Management List <linux-mm@...ck.org>, ltp@...ts.linux.it, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jakub Kicinski <kuba@...nel.org>, Marc Kleine-Budde <mkl@...gutronix.de>, Paolo Abeni <pabeni@...hat.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Vincent Mailhol <mailhol.vincent@...adoo.fr>, Wolfgang Grandegger <wg@...ndegger.com>, linux-can@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [PATCH v2] can: slcan: do not sleep with a spin lock held On 13. 07. 22, 17:44, Dario Binacchi wrote: > We can't call close_candev() with a spin lock held, so release the lock > before calling it. > > Fixes: c4e54b063f42f ("can: slcan: use CAN network device driver API") > Reported-by: kernel test robot <oliver.sang@...el.com> > Link: https://lore.kernel.org/linux-kernel/Ysrf1Yc5DaRGN1WE@xsang-OptiPlex-9020/ > Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com> > > --- > > Changes in v2: > - Release the lock just before calling the close_candev(). > > drivers/net/can/slcan/slcan-core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c > index 54d29a410ad5..5214421dedf3 100644 > --- a/drivers/net/can/slcan/slcan-core.c > +++ b/drivers/net/can/slcan/slcan-core.c > @@ -689,6 +689,7 @@ static int slc_close(struct net_device *dev) > clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); > } > netif_stop_queue(dev); > + spin_unlock_bh(&sl->lock); > close_candev(dev); > sl->can.state = CAN_STATE_STOPPED; > if (sl->can.bittiming.bitrate == CAN_BITRATE_UNKNOWN) > @@ -696,7 +697,6 @@ static int slc_close(struct net_device *dev) > > sl->rcount = 0; > sl->xleft = 0; So all these sets need not be under the spinlock? If so, you should explain why in the commit message. > - spin_unlock_bh(&sl->lock); > > return 0; > } thanks, -- js suse labs
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