From: Peter Rosin <peda@axentia.se>
To: linux-kernel@vger.kernel.org
Cc: Peter Rosin <peda@axentia.se>, Peter Huewe <peterhuewe@gmx.de>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Brian Norris <computersforpeace@gmail.com>,
Gregory Fong <gregory.0xf0@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
bcm-kernel-feedback-list@broadcom.com,
Sekhar Nori <nsekhar@ti.com>, Kevin Hilman <khilman@kernel.org>,
Haavard Skinnemoen <hskinnemoen@gmail.com>,
Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Orson Zhai <orsonzhai@gmail.com>,
Baolin Wang <baolin.wang@linaro.org>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Laxman Dewangan <ldewangan@nvidia.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Wolfram Sang <wsa@the-dreams.de>,
Guenter Roeck <linux@roeck-us.net>, Crt Mori <cmo@melexis.com>,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Antti Palosaari <crope@iki.fi>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Michael Krufky <mkrufky@linuxtv.org>,
Lee Jones <lee.jones@linaro.org>,
linux-integrity@vger.kernel.org, linux-i2c@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-iio@vger.kernel.org, linux-input@vger.kernel.org,
linux-media@vger.kernel.org
Subject: [PATCH 03/11] i2c: mux: pca9541: switch to i2c_lock_segment
Date: Fri, 15 Jun 2018 12:14:58 +0200 [thread overview]
Message-ID: <20180615101506.8012-4-peda@axentia.se> (raw)
In-Reply-To: <20180615101506.8012-1-peda@axentia.se>
Locking the root adapter for __i2c_transfer will deadlock if the
device sits behind a mux-locked I2C mux. Switch to the finer-grained
i2c_lock_segment. If the device does not sit behind a mux-locked mux,
the two locking variants are equivalent.
Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/muxes/i2c-mux-pca9541.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c
index 6a39adaf433f..74c560ed44cc 100644
--- a/drivers/i2c/muxes/i2c-mux-pca9541.c
+++ b/drivers/i2c/muxes/i2c-mux-pca9541.c
@@ -345,11 +345,11 @@ static int pca9541_probe(struct i2c_client *client,
/*
* I2C accesses are unprotected here.
- * We have to lock the adapter before releasing the bus.
+ * We have to lock the I2C segment before releasing the bus.
*/
- i2c_lock_adapter(adap);
+ i2c_lock_segment(adap);
pca9541_release_bus(client);
- i2c_unlock_adapter(adap);
+ i2c_unlock_segment(adap);
/* Create mux adapter */
--
2.11.0
next prev parent reply other threads:[~2018-06-15 10:19 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-15 10:14 [PATCH 00/11] Split i2c_lock_adapter into i2c_lock_root and i2c_lock_segment Peter Rosin
2018-06-15 10:14 ` [PATCH 01/11] i2c: add helpers for locking the I2C segment Peter Rosin
2018-06-18 11:05 ` Wolfram Sang
2018-06-18 11:32 ` Peter Rosin
2018-06-18 11:54 ` Wolfram Sang
2018-06-19 21:29 ` Peter Rosin
2018-06-15 10:14 ` [PATCH 02/11] tpm/tpm_i2c_infineon: switch to i2c_lock_segment Peter Rosin
2018-06-19 12:56 ` Jarkko Sakkinen
2018-06-19 13:05 ` Peter Rosin
2018-06-15 10:14 ` Peter Rosin [this message]
2018-06-15 10:14 ` [PATCH 04/11] input: rohm_bu21023: " Peter Rosin
2018-06-19 18:40 ` Dmitry Torokhov
2018-06-15 10:15 ` [PATCH 05/11] media: af9013: " Peter Rosin
2018-06-15 10:15 ` [PATCH 06/11] media: drxk_hard: " Peter Rosin
2018-06-15 10:15 ` [PATCH 07/11] media: rtl2830: " Peter Rosin
2018-06-15 10:15 ` [PATCH 08/11] media: tda1004x: " Peter Rosin
2018-06-15 10:15 ` [PATCH 09/11] media: tda18271: " Peter Rosin
2018-06-15 10:15 ` [PATCH 10/11] mfd: 88pm860x-i2c: " Peter Rosin
2018-06-15 10:15 ` [PATCH 11/11] i2c: rename i2c_lock_adapter to i2c_lock_root Peter Rosin
2018-06-18 11:06 ` [PATCH 00/11] Split i2c_lock_adapter into i2c_lock_root and i2c_lock_segment Wolfram Sang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180615101506.8012-4-peda@axentia.se \
--to=peda@axentia.se \
--cc=arnd@arndb.de \
--cc=baolin.wang@linaro.org \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=cmo@melexis.com \
--cc=computersforpeace@gmail.com \
--cc=crope@iki.fi \
--cc=dmitry.torokhov@gmail.com \
--cc=f.fainelli@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=gregory.0xf0@gmail.com \
--cc=hskinnemoen@gmail.com \
--cc=jarkko.sakkinen@linux.intel.com \
--cc=jgg@ziepe.ca \
--cc=jic23@kernel.org \
--cc=jonathanh@nvidia.com \
--cc=kgene@kernel.org \
--cc=khilman@kernel.org \
--cc=knaack.h@gmx.de \
--cc=krzk@kernel.org \
--cc=lars@metafoo.de \
--cc=ldewangan@nvidia.com \
--cc=lee.jones@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-input@vger.kernel.org \
--cc=linux-integrity@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-samsung-soc@vger.kernel.org \
--cc=linux-tegra@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=mchehab@kernel.org \
--cc=mkrufky@linuxtv.org \
--cc=nsekhar@ti.com \
--cc=orsonzhai@gmail.com \
--cc=peterhuewe@gmx.de \
--cc=pmeerw@pmeerw.net \
--cc=thierry.reding@gmail.com \
--cc=wsa@the-dreams.de \
--cc=zhang.lyra@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).