linux-kernel - Re: [PATCH v6] can, tty: can327 CAN/ldisc driver for ELM327 based OBD-II adapters

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Message-ID: <20220513114642.77jfdscjwzgyiwm3@pengutronix.de>
Date:   Fri, 13 May 2022 13:46:42 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <vincent.mailhol@...il.com>
Cc:     Max Staudt <max@...as.org>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oliver Neukum <oneukum@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] can, tty: can327 CAN/ldisc driver for ELM327 based
 OBD-II adapters

On 13.05.2022 11:38:31, Vincent Mailhol wrote:
> > +static void elm327_parse_line(struct can327 *elm, size_t len)
> > +{
> > +       lockdep_assert_held(&elm->lock);
> 
> You are using many of those lockdep_assert_held(&elm->lock);
> 
> I guess you put them for debug purpose and probaly some of those can
> be removed (if you see a genuine risk at some places, then OK to keep
> as a safety net, but a bit of clean up can be done here, I think).
> 
> This comment applies to all use of lockdep_assert_held().

These statements document that the code must be called with the lock
held. They optimize away if lockdep is not enabled. Better keep them in
place.

regards,
Marc

-- 
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