From: SF Markus Elfring <elfring@users.sourceforge.net> To: devel@driverdev.osuosl.org, linux-iio@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Hartmut Knaack <knaack.h@gmx.de>, Jonathan Cameron <jic23@kernel.org>, Lars-Peter Clausen <lars@metafoo.de>, Michael Hennerich <Michael.Hennerich@analog.com>, Peter Meerwald-Stadler <pmeerw@pmeerw.net> Cc: LKML <linux-kernel@vger.kernel.org>, kernel-janitors@vger.kernel.org Subject: [PATCH] staging: iio: ad7746: Improve unlocking of a mutex in ad7746_start_calib() Date: Fri, 3 Nov 2017 09:33:57 +0100 [thread overview] Message-ID: <57f5d20b-cc13-07b2-51cf-53704327df27@users.sourceforge.net> (raw) From: Markus Elfring <elfring@users.sourceforge.net> Date: Fri, 3 Nov 2017 09:26:28 +0100 * Add a jump target so that a call of the function "mutex_unlock" is stored only twice in this function implementation. * Replace two calls by goto statements. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> --- drivers/staging/iio/cdc/ad7746.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c index a124853a05f0..c4a864725376 100644 --- a/drivers/staging/iio/cdc/ad7746.c +++ b/drivers/staging/iio/cdc/ad7746.c @@ -302,23 +302,24 @@ static inline ssize_t ad7746_start_calib(struct device *dev, mutex_lock(&chip->lock); regval |= chip->config; ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval); - if (ret < 0) { - mutex_unlock(&chip->lock); - return ret; - } + if (ret < 0) + goto unlock; do { msleep(20); ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG); - if (ret < 0) { - mutex_unlock(&chip->lock); - return ret; - } + if (ret < 0) + goto unlock; + } while ((ret == regval) && timeout--); mutex_unlock(&chip->lock); return len; + +unlock: + mutex_unlock(&chip->lock); + return ret; } static ssize_t ad7746_start_offset_calib(struct device *dev, -- 2.15.0
WARNING: multiple messages have this Message-ID (diff)
From: SF Markus Elfring <elfring@users.sourceforge.net> To: devel@driverdev.osuosl.org, linux-iio@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Hartmut Knaack <knaack.h@gmx.de>, Jonathan Cameron <jic23@kernel.org>, Lars-Peter Clausen <lars@metafoo.de>, Michael Hennerich <Michael.Hennerich@analog.com>, Peter Meerwald-Stadler <pmeerw@pmeerw.net> Cc: LKML <linux-kernel@vger.kernel.org>, kernel-janitors@vger.kernel.org Subject: [PATCH] staging: iio: ad7746: Improve unlocking of a mutex in ad7746_start_calib() Date: Fri, 03 Nov 2017 08:33:57 +0000 [thread overview] Message-ID: <57f5d20b-cc13-07b2-51cf-53704327df27@users.sourceforge.net> (raw) From: Markus Elfring <elfring@users.sourceforge.net> Date: Fri, 3 Nov 2017 09:26:28 +0100 * Add a jump target so that a call of the function "mutex_unlock" is stored only twice in this function implementation. * Replace two calls by goto statements. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> --- drivers/staging/iio/cdc/ad7746.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c index a124853a05f0..c4a864725376 100644 --- a/drivers/staging/iio/cdc/ad7746.c +++ b/drivers/staging/iio/cdc/ad7746.c @@ -302,23 +302,24 @@ static inline ssize_t ad7746_start_calib(struct device *dev, mutex_lock(&chip->lock); regval |= chip->config; ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval); - if (ret < 0) { - mutex_unlock(&chip->lock); - return ret; - } + if (ret < 0) + goto unlock; do { msleep(20); ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG); - if (ret < 0) { - mutex_unlock(&chip->lock); - return ret; - } + if (ret < 0) + goto unlock; + } while ((ret = regval) && timeout--); mutex_unlock(&chip->lock); return len; + +unlock: + mutex_unlock(&chip->lock); + return ret; } static ssize_t ad7746_start_offset_calib(struct device *dev, -- 2.15.0
next reply other threads:[~2017-11-03 8:34 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-11-03 8:33 SF Markus Elfring [this message] 2017-11-03 8:33 ` [PATCH] staging: iio: ad7746: Improve unlocking of a mutex in ad7746_start_calib() SF Markus Elfring 2017-11-19 15:37 ` Jonathan Cameron 2017-11-19 15:37 ` Jonathan Cameron
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