From: Peter Zijlstra <peterz@infradead.org>
To: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Alexandre Courbot <gnurou@gmail.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Vignesh R <vigneshr@ti.com>, Yong Li <yong.b.li@intel.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Ingo Molnar <mingo@redhat.com>, Wolfram Sang <wsa@the-dreams.de>,
Peter Rosin <peda@axentia.se>,
linux-i2c <linux-i2c@vger.kernel.org>,
linux-gpio <linux-gpio@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 0/4] gpio: fix an incorrect lockdep warning
Date: Sat, 17 Sep 2016 03:19:52 +0200 [thread overview]
Message-ID: <20160917011952.GK5016@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1474041765-17818-1-git-send-email-bgolaszewski@baylibre.com>
On Fri, Sep 16, 2016 at 06:02:41PM +0200, Bartosz Golaszewski wrote:
> If an I2C GPIO multiplexer is driven by a GPIO provided by an expander
> when there's a second expander using the same device driver on one of
> the I2C bus segments, lockdep prints a deadlock warning when trying to
> set the direction or the value of the GPIOs provided by the second
> expander.
>
> This series exports an already existing function from i2c-core as
> public API and reuses it in pca953x to pass a correct lock subclass
> to lockdep.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Note: if this series gets merged, I'll prepare follow-up patches for
> other expanders for which a similar problem could potentially occur.
We can't push this annotation into the i2c core, can we? Since the mutex
is in driver specific code, not more generic...
next prev parent reply other threads:[~2016-09-17 1:20 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-16 16:02 [PATCH v2 0/4] gpio: fix an incorrect lockdep warning Bartosz Golaszewski
2016-09-16 16:02 ` [PATCH v2 1/4] i2c: export i2c_adapter_depth() Bartosz Golaszewski
2016-09-16 16:02 ` [PATCH v2 2/4] lockdep: make MAX_LOCKDEP_SUBCLASSES unconditionally visible Bartosz Golaszewski
2016-09-16 16:02 ` [PATCH v2 3/4] i2c: add a warning to i2c_adapter_depth() Bartosz Golaszewski
2016-09-16 16:02 ` [PATCH v2 4/4] gpio: pca953x: fix an incorrect lockdep warning Bartosz Golaszewski
2016-09-21 5:45 ` Wolfram Sang
2016-09-23 8:10 ` Linus Walleij
2016-09-24 8:55 ` Wolfram Sang
2016-09-24 9:15 ` Wolfram Sang
2016-09-24 14:26 ` Geert Uytterhoeven
2016-09-16 17:26 ` [PATCH v2 0/4] gpio: " Wolfram Sang
2016-09-16 17:45 ` Peter Rosin
2016-09-16 17:58 ` Wolfram Sang
2016-09-18 8:52 ` Peter Rosin
2016-09-18 19:43 ` Bartosz Golaszewski
2016-09-18 19:45 ` Bartosz Golaszewski
2016-09-19 8:01 ` Peter Rosin
2016-09-19 8:14 ` Peter Zijlstra
2016-09-19 8:48 ` Peter Rosin
2016-09-19 9:03 ` Peter Zijlstra
2016-09-20 8:48 ` Peter Rosin
2016-09-20 10:07 ` Bartosz Golaszewski
2016-09-20 10:28 ` Peter Zijlstra
2016-09-20 10:48 ` Peter Rosin
2016-09-20 11:30 ` Geert Uytterhoeven
2016-09-20 12:32 ` Bartosz Golaszewski
2016-09-20 15:33 ` Thomas Gleixner
2016-09-21 9:47 ` Peter Rosin
2016-09-17 1:19 ` Peter Zijlstra [this message]
2016-09-17 10:18 ` Wolfram Sang
2016-09-17 18:59 ` Bartosz Golaszewski
2016-09-24 8:56 ` Wolfram Sang
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