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[23.88.128.2]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-69d0460b68bsm238434eaf.4.2026.05.14.20.13.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 20:13:44 -0700 (PDT) From: Maxwell Doose To: jic23@kernel.org Cc: Tomasz Duszynski , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3] iio: chemical: sps30: Replace manual locking with RAII locking Date: Thu, 14 May 2026 22:13:42 -0500 Message-ID: <20260515031343.56039-1-m32285159@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Replace manual mutex_lock() and mutex_unlock() calls with the much newer guard(mutex)() and scoped_guard() macros to enable RAII patterns, modernize the driver, and to increase readability. Signed-off-by: Maxwell Doose --- v2: - Switch over some scoped_guard()s to guard(mutex)() per David's suggestion. - Remove redundant whitespace per Andy's suggestion. - Add new wrapper sps30_do_meas() per Andy's suggestion (see commit message). - Add Joshua's RB (link: https://lore.kernel.org/linux-iio/CAKqfh0FWig8mRR-xhvnfcFeSinR6RySyPaf9Gbpb6WU+diiiUQ@mail.gmail.com/T/#t) v3: - Remove sps30_do_meas() wrapper per Andy's suggestion. - Remove Joshua's RB (major changes). drivers/iio/chemical/sps30.c | 29 +++++++++++++---------------- 1 file changed, 13 insertions(+), 16 deletions(-) diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c index a934bf0298dd..9cb201cf0f15 100644 --- a/drivers/iio/chemical/sps30.c +++ b/drivers/iio/chemical/sps30.c @@ -5,6 +5,7 @@ * Copyright (c) Tomasz Duszynski */ +#include #include #include #include @@ -111,9 +112,8 @@ static irqreturn_t sps30_trigger_handler(int irq, void *p) aligned_s64 ts; } scan; - mutex_lock(&state->lock); - ret = sps30_do_meas(state, scan.data, ARRAY_SIZE(scan.data)); - mutex_unlock(&state->lock); + scoped_guard(mutex, &state->lock) + ret = sps30_do_meas(state, scan.data, ARRAY_SIZE(scan.data)); if (ret) goto err; @@ -135,8 +135,8 @@ static int sps30_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_PROCESSED: switch (chan->type) { - case IIO_MASSCONCENTRATION: - mutex_lock(&state->lock); + case IIO_MASSCONCENTRATION: { + guard(mutex)(&state->lock); /* read up to the number of bytes actually needed */ switch (chan->channel2) { case IIO_MOD_PM1: @@ -152,7 +152,6 @@ static int sps30_read_raw(struct iio_dev *indio_dev, ret = sps30_do_meas(state, data, 4); break; } - mutex_unlock(&state->lock); if (ret) return ret; @@ -160,6 +159,7 @@ static int sps30_read_raw(struct iio_dev *indio_dev, *val2 = (data[chan->address] % 100) * 10000; return IIO_VAL_INT_PLUS_MICRO; + } default: return -EINVAL; } @@ -197,9 +197,9 @@ static ssize_t start_cleaning_store(struct device *dev, if (kstrtoint(buf, 0, &val) || val != 1) return -EINVAL; - mutex_lock(&state->lock); + guard(mutex)(&state->lock); + ret = state->ops->clean_fan(state); - mutex_unlock(&state->lock); if (ret) return ret; @@ -215,9 +215,9 @@ static ssize_t cleaning_period_show(struct device *dev, __be32 val; int ret; - mutex_lock(&state->lock); + guard(mutex)(&state->lock); + ret = state->ops->read_cleaning_period(state, &val); - mutex_unlock(&state->lock); if (ret) return ret; @@ -238,12 +238,11 @@ static ssize_t cleaning_period_store(struct device *dev, struct device_attribute (val > SPS30_AUTO_CLEANING_PERIOD_MAX)) return -EINVAL; - mutex_lock(&state->lock); + guard(mutex)(&state->lock); + ret = state->ops->write_cleaning_period(state, cpu_to_be32(val)); - if (ret) { - mutex_unlock(&state->lock); + if (ret) return ret; - } msleep(20); @@ -256,8 +255,6 @@ static ssize_t cleaning_period_store(struct device *dev, struct device_attribute dev_warn(dev, "period changed but reads will return the old value\n"); - mutex_unlock(&state->lock); - return len; } -- 2.54.0