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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Vincent MAILHOL <mailhol.vincent@wanadoo.fr>
Cc: linux-can <linux-can@vger.kernel.org>,
	"Stefan Mätje" <Stefan.Maetje@esd.eu>,
	netdev <netdev@vger.kernel.org>,
	"open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 5/7] can: netlink: add interface for CAN-FD Transmitter Delay Compensation (TDC)
Date: Wed, 18 Aug 2021 10:43:12 +0200	[thread overview]
Message-ID: <20210818084312.6i5buvdp7hsu4kmy@pengutronix.de> (raw)
In-Reply-To: <CAMZ6Rq+PPH8mCayZg1ghftfoU8_y8rzAtO=Of2F5VZxcBKn4KA@mail.gmail.com>

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On 18.08.2021 17:37:17, Vincent MAILHOL wrote:
> > It's not a race. Consider this command:
> >
> > | ip up tdc-mode manual tdco 111 tdcv 33  # 111 is out of range, 33 is valid
> >
> > tdcv is checked first and valid, then it's assigned to the priv->tdc.
> > tdco is checked second and invalid, then can_tdc_changelink() returns -EINVAL.
> >
> > tdc ends up being half set :(
> >
> > So the setting of tdc is inconsistent and when you do a "ip down" "ip
> > up" then it results in a tdco=0 tdcv=33 mode=manual.
> 
> My bad. Now I understand the issue.
> I was confused because tdco=111 is in the valid range of my driver...

:D

> I will squash your patch.
> 
> Actually, I think that there is one more thing which needs to be
> fixed: If can_tdc_changelink() fails (e.g. value out of range),
> the CAN_CTRLMODE_TDC_AUTO or CAN_CTRLMODE_TDC_MANUAL would still
> be set, meaning that can_tdc_is_enabled() would return true. So I
> will add a "fail" branch to clear the flags.

Ok.

regard,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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  reply	other threads:[~2021-08-18  8:43 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-15  3:32 [PATCH v5 0/7] add the netlink interface for CAN-FD Transmitter Delay Compensation (TDC) Vincent Mailhol
2021-08-15  3:32 ` [PATCH v5 1/7] can: netlink: allow user to turn off unsupported features Vincent Mailhol
2021-08-19  7:45   ` Marc Kleine-Budde
2021-08-19  9:24     ` Vincent MAILHOL
2021-08-19 10:07       ` Marc Kleine-Budde
2021-08-15  3:32 ` [PATCH v5 2/7] can: bittiming: allow TDC{V,O} to be zero and add can_tdc_const::tdc{v,o,f}_min Vincent Mailhol
2021-08-16  8:42   ` Marc Kleine-Budde
2021-08-16 10:24     ` Vincent MAILHOL
2021-08-16 12:25       ` Marc Kleine-Budde
2021-08-16 12:33         ` Marc Kleine-Budde
2021-08-16 13:43           ` Marc Kleine-Budde
2021-08-16 15:49             ` Vincent MAILHOL
2021-08-16 16:04               ` Vincent MAILHOL
2021-08-17  1:12                 ` Vincent MAILHOL
2021-08-17 20:01               ` Marc Kleine-Budde
2021-08-18  9:22                 ` Vincent MAILHOL
2021-08-18 12:29                   ` Marc Kleine-Budde
2021-08-18 14:17                     ` Vincent MAILHOL
2021-08-20  6:12                       ` Vincent MAILHOL
2021-08-16 14:10           ` Vincent MAILHOL
2021-08-16 14:30             ` Marc Kleine-Budde
2021-08-17  9:43               ` Marc Kleine-Budde
2021-08-16 13:49         ` Stefan Mätje
2021-08-16 15:56           ` Vincent MAILHOL
2021-08-15  3:32 ` [PATCH v5 3/7] can: bittiming: change unit of TDC parameters to clock periods Vincent Mailhol
2021-08-15  3:32 ` [PATCH v5 4/7] can: dev: add can_tdc_get_relative_tdco() helper function Vincent Mailhol
2021-08-16 11:27   ` Marc Kleine-Budde
2021-08-15  3:32 ` [PATCH v5 5/7] can: netlink: add interface for CAN-FD Transmitter Delay Compensation (TDC) Vincent Mailhol
2021-08-17 19:55   ` Marc Kleine-Budde
2021-08-18  8:08     ` Vincent MAILHOL
2021-08-18  8:19       ` Marc Kleine-Budde
2021-08-18  8:37         ` Vincent MAILHOL
2021-08-18  8:43           ` Marc Kleine-Budde [this message]
2021-08-15  3:32 ` [PATCH v5 6/7] can: netlink: add can_priv::do_get_auto_tdcv() to retrieve tdcv from device Vincent Mailhol
2021-08-15  3:32 ` [PATCH v5 7/7] can: etas_es58x: clean-up documentation of struct es58x_fd_tx_conf_msg Vincent Mailhol
2021-08-19 10:08   ` Marc Kleine-Budde

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