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Fri, 15 Jun 2018 10:15:35 +0000 From: Peter Rosin To: linux-kernel@vger.kernel.org Cc: Peter Rosin , Peter Huewe , Jarkko Sakkinen , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , Brian Norris , Gregory Fong , Florian Fainelli , bcm-kernel-feedback-list@broadcom.com, Sekhar Nori , Kevin Hilman , Haavard Skinnemoen , Kukjin Kim , Krzysztof Kozlowski , Orson Zhai , Baolin Wang , Chunyan Zhang , Laxman Dewangan , Thierry Reding , Jonathan Hunter , Wolfram Sang , Guenter Roeck , Crt Mori , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Dmitry Torokhov , Antti Palosaari , Mauro Carvalho Chehab , Michael Krufky , Lee Jones , 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 Message-Id: <20180615101506.8012-2-peda@axentia.se> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180615101506.8012-1-peda@axentia.se> References: <20180615101506.8012-1-peda@axentia.se> MIME-Version: 1.0 X-Originating-IP: [85.226.244.23] X-ClientProxiedBy: HE1PR05CA0248.eurprd05.prod.outlook.com (2603:10a6:3:fb::24) To HE1PR0201MB2460.eurprd02.prod.outlook.com (2603:10a6:3:82::8) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cff5233f-799d-4daa-9cd7-08d5d2a8f025 X-Microsoft-Antispam: UriScan:; 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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 --- 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 */