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 01/11] i2c: add helpers for locking the I2C segment
Date: Fri, 15 Jun 2018 12:14:56 +0200 [thread overview]
Message-ID: <20180615101506.8012-2-peda@axentia.se> (raw)
In-Reply-To: <20180615101506.8012-1-peda@axentia.se>
This is what almost all drivers want to do. By only advertising
i2c_lock_adapter, they are tricked into locking the root adapter
which is too big of a hammer in most cases.
While at it, convert all open-coded locking of the I2C segment.
Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/i2c-core-base.c | 6 +++---
drivers/i2c/i2c-core-smbus.c | 4 ++--
include/linux/i2c.h | 18 ++++++++++++++++++
3 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 1ba40bb2b966..3eb09dc20573 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1932,16 +1932,16 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
#endif
if (in_atomic() || irqs_disabled()) {
- ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT);
+ ret = i2c_trylock_segment(adap);
if (!ret)
/* I2C activity is ongoing. */
return -EAGAIN;
} else {
- i2c_lock_bus(adap, I2C_LOCK_SEGMENT);
+ i2c_lock_segment(adap);
}
ret = __i2c_transfer(adap, msgs, num);
- i2c_unlock_bus(adap, I2C_LOCK_SEGMENT);
+ i2c_unlock_segment(adap);
return ret;
} else {
diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c
index b5aec33002c3..8a820fdef3e0 100644
--- a/drivers/i2c/i2c-core-smbus.c
+++ b/drivers/i2c/i2c-core-smbus.c
@@ -537,7 +537,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB;
if (adapter->algo->smbus_xfer) {
- i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
+ i2c_lock_segment(adapter);
/* Retry automatically on arbitration loss */
orig_jiffies = jiffies;
@@ -551,7 +551,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
orig_jiffies + adapter->timeout))
break;
}
- i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
+ i2c_unlock_segment(adapter);
if (res != -EOPNOTSUPP || !adapter->algo->master_xfer)
goto trace;
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 44ad14e016b5..c9080d49e988 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -768,6 +768,24 @@ i2c_unlock_adapter(struct i2c_adapter *adapter)
i2c_unlock_bus(adapter, I2C_LOCK_ROOT_ADAPTER);
}
+static inline void
+i2c_lock_segment(struct i2c_adapter *adapter)
+{
+ i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
+}
+
+static inline int
+i2c_trylock_segment(struct i2c_adapter *adapter)
+{
+ return i2c_trylock_bus(adapter, I2C_LOCK_SEGMENT);
+}
+
+static inline void
+i2c_unlock_segment(struct i2c_adapter *adapter)
+{
+ i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
+}
+
/*flags for the client struct: */
#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
--
2.11.0
next prev parent reply other threads:[~2018-06-15 10:15 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 ` Peter Rosin [this message]
2018-06-18 11:05 ` [PATCH 01/11] i2c: add helpers for locking the I2C segment 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 ` [PATCH 03/11] i2c: mux: pca9541: " Peter Rosin
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=20180615101506.8012-2-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).