Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753691AbcDCI5E (ORCPT ); Sun, 3 Apr 2016 04:57:04 -0400 Received: from mail.lysator.liu.se ([130.236.254.3]:38427 "EHLO mail.lysator.liu.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752970AbcDCI47 (ORCPT ); Sun, 3 Apr 2016 04:56:59 -0400 From: Peter Rosin To: linux-kernel@vger.kernel.org Cc: Peter Rosin , Wolfram Sang , Jonathan Corbet , Peter Korsgaard , Guenter Roeck , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald , Antti Palosaari , Mauro Carvalho Chehab , Rob Herring , Frank Rowand , Grant Likely , Andrew Morton , Greg Kroah-Hartman , "David S. Miller" , Kalle Valo , Joe Perches , Jiri Slaby , Daniel Baluta , Adriana Reus , Lucas De Marchi , Matt Ranostay , Krzysztof Kozlowski , Terry Heo , Hans Verkuil , Arnd Bergmann , Tommi Rantala , linux-i2c@vger.kernel.org, linux-doc@vger.kernel.org, linux-iio@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, Peter Rosin Subject: [PATCH v6 17/24] i2c: muxes always lock the parent adapter Date: Sun, 3 Apr 2016 10:52:47 +0200 Message-Id: <1459673574-11440-18-git-send-email-peda@lysator.liu.se> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1459673574-11440-1-git-send-email-peda@lysator.liu.se> References: <1459673574-11440-1-git-send-email-peda@lysator.liu.se> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3267 Lines: 105 From: Peter Rosin Instead of checking for i2c parent adapters for every lock/unlock, simply override the locking for muxes to always lock/unlock the parent adapter directly. Signed-off-by: Peter Rosin --- drivers/i2c/i2c-core.c | 21 +++------------------ drivers/i2c/i2c-mux.c | 27 +++++++++++++++++++++++++++ 2 files changed, 30 insertions(+), 18 deletions(-) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 21f46d011c33..5314434c2b5d 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -967,12 +967,7 @@ static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr) */ static void i2c_adapter_lock_bus(struct i2c_adapter *adapter, int flags) { - struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); - - if (parent) - i2c_lock_adapter(parent); - else - rt_mutex_lock(&adapter->bus_lock); + rt_mutex_lock(&adapter->bus_lock); } /** @@ -983,12 +978,7 @@ static void i2c_adapter_lock_bus(struct i2c_adapter *adapter, int flags) */ static int i2c_adapter_trylock_bus(struct i2c_adapter *adapter, int flags) { - struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); - - if (parent) - return parent->trylock_bus(parent, flags); - else - return rt_mutex_trylock(&adapter->bus_lock); + return rt_mutex_trylock(&adapter->bus_lock); } /** @@ -999,12 +989,7 @@ static int i2c_adapter_trylock_bus(struct i2c_adapter *adapter, int flags) */ static void i2c_adapter_unlock_bus(struct i2c_adapter *adapter, int flags) { - struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); - - if (parent) - i2c_unlock_adapter(parent); - else - rt_mutex_unlock(&adapter->bus_lock); + rt_mutex_unlock(&adapter->bus_lock); } static void i2c_dev_set_name(struct i2c_adapter *adap, diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c index 08d99e776a69..e1b2bb112efd 100644 --- a/drivers/i2c/i2c-mux.c +++ b/drivers/i2c/i2c-mux.c @@ -98,6 +98,30 @@ static unsigned int i2c_mux_parent_classes(struct i2c_adapter *parent) return class; } +static void i2c_parent_lock_bus(struct i2c_adapter *adapter, int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + parent->lock_bus(parent, flags); +} + +static int i2c_parent_trylock_bus(struct i2c_adapter *adapter, int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + return parent->trylock_bus(parent, flags); +} + +static void i2c_parent_unlock_bus(struct i2c_adapter *adapter, int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + parent->unlock_bus(parent, flags); +} + int i2c_mux_reserve_adapters(struct i2c_mux_core *muxc, int adapters) { struct i2c_adapter **adapter; @@ -192,6 +216,9 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc, priv->adap.retries = parent->retries; priv->adap.timeout = parent->timeout; priv->adap.quirks = parent->quirks; + priv->adap.lock_bus = i2c_parent_lock_bus; + priv->adap.trylock_bus = i2c_parent_trylock_bus; + priv->adap.unlock_bus = i2c_parent_unlock_bus; /* Sanity check on class */ if (i2c_mux_parent_classes(parent) & class) -- 2.1.4