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Sun, 15 Mar 2026 05:55:17 -0700 (PDT) From: Sanjay Chitroda X-Google-Original-From: Sanjay Chitroda To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org Cc: kees@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, sanjayembeddedse@gmail.com Subject: [PATCH v3 1/3] iio: ssp_sensors: ssp_spi: use guard() to release mutexes Date: Sun, 15 Mar 2026 18:25:07 +0530 Message-Id: <20260315125509.857195-2-sanjayembedded@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260315125509.857195-1-sanjayembedded@gmail.com> References: <20260315125509.857195-1-sanjayembedded@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Sanjay Chitroda Replace explicit mutex_lock() and mutex_unlock() with the guard() macro for cleaner and safer mutex handling. Signed-off-by: Sanjay Chitroda --- drivers/iio/common/ssp_sensors/ssp_spi.c | 54 ++++++++++-------------- 1 file changed, 22 insertions(+), 32 deletions(-) diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/= ssp_sensors/ssp_spi.c index 6c81c0385fb5..87a38002b218 100644 --- a/drivers/iio/common/ssp_sensors/ssp_spi.c +++ b/drivers/iio/common/ssp_sensors/ssp_spi.c @@ -2,6 +2,7 @@ /* * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. */ +#include =20 #include "ssp.h" =20 @@ -189,55 +190,49 @@ static int ssp_do_transfer(struct ssp_data *data, str= uct ssp_msg *msg, =20 msg->done =3D done; =20 - mutex_lock(&data->comm_lock); + guard(mutex)(&data->comm_lock); =20 status =3D ssp_check_lines(data, false); - if (status < 0) - goto _error_locked; + if (status < 0) { + data->timeout_cnt++; + return status; + } =20 status =3D spi_write(data->spi, msg->buffer, SSP_HEADER_SIZE); if (status < 0) { gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1); dev_err(SSP_DEV, "%s spi_write fail\n", __func__); - goto _error_locked; + data->timeout_cnt++; + return status; } =20 if (!use_no_irq) { - mutex_lock(&data->pending_lock); - list_add_tail(&msg->list, &data->pending_list); - mutex_unlock(&data->pending_lock); + scoped_guard(mutex, &data->pending_lock) + list_add_tail(&msg->list, &data->pending_list); } =20 status =3D ssp_check_lines(data, true); if (status < 0) { if (!use_no_irq) { - mutex_lock(&data->pending_lock); - list_del(&msg->list); - mutex_unlock(&data->pending_lock); + scoped_guard(mutex, &data->pending_lock) + list_add_tail(&msg->list, &data->pending_list); } - goto _error_locked; + data->timeout_cnt++; + return status; } =20 - mutex_unlock(&data->comm_lock); - if (!use_no_irq && done) if (wait_for_completion_timeout(done, msecs_to_jiffies(timeout)) =3D=3D 0) { - mutex_lock(&data->pending_lock); - list_del(&msg->list); - mutex_unlock(&data->pending_lock); + scoped_guard(mutex, &data->pending_lock) + list_add_tail(&msg->list, &data->pending_list); =20 data->timeout_cnt++; return -ETIMEDOUT; } =20 return 0; - -_error_locked: - mutex_unlock(&data->comm_lock); - data->timeout_cnt++; - return status; } =20 static inline int ssp_spi_sync_command(struct ssp_data *data, @@ -360,7 +355,7 @@ int ssp_irq_msg(struct ssp_data *data) * this is a small list, a few elements - the packets can be * received with no order */ - mutex_lock(&data->pending_lock); + guard(mutex)(&data->pending_lock); list_for_each_entry_safe(iter, n, &data->pending_list, list) { if (iter->options =3D=3D msg_options) { list_del(&iter->list); @@ -376,10 +371,8 @@ int ssp_irq_msg(struct ssp_data *data) * check but let's handle this */ buffer =3D kmalloc(length, GFP_KERNEL | GFP_DMA); - if (!buffer) { - ret =3D -ENOMEM; - goto _unlock; - } + if (!buffer) + return -ENOMEM; =20 /* got dead packet so it is always an error */ ret =3D spi_read(data->spi, buffer, length); @@ -391,7 +384,7 @@ int ssp_irq_msg(struct ssp_data *data) dev_err(SSP_DEV, "No match error %x\n", msg_options); =20 - goto _unlock; + return ret; } =20 if (msg_type =3D=3D SSP_AP2HUB_READ) @@ -409,15 +402,13 @@ int ssp_irq_msg(struct ssp_data *data) msg->length =3D 1; =20 list_add_tail(&msg->list, &data->pending_list); - goto _unlock; + return ret; } } =20 if (msg->done) if (!completion_done(msg->done)) complete(msg->done); -_unlock: - mutex_unlock(&data->pending_lock); break; case SSP_HUB2AP_WRITE: buffer =3D kzalloc(length, GFP_KERNEL | GFP_DMA); @@ -448,7 +439,7 @@ void ssp_clean_pending_list(struct ssp_data *data) { struct ssp_msg *msg, *n; =20 - mutex_lock(&data->pending_lock); 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charset="utf-8" From: Sanjay Chitroda Replace manual cleanup logic with __free attribute from cleanup.h. This removes explicit kfree() calls and simplifies the error handling paths. No functional change intended for kmalloc(). Signed-off-by: Sanjay Chitroda --- Changes in v3: - prepare series to have all respective cleanup API support for the ssp_sen= sors following input from Andy Shevchenko - Link to v2 https://lore.kernel.org/all/20260311174151.3441429-1-sanjayemb= edded@gmail.com/ Changes in v2: - split series to individual patch - address review comment from Andy Shevchenko - Link to v1 https://lore.kernel.org/all/20260310200513.2162018-3-sanjayemb= edded@gmail.com/ --- drivers/iio/common/ssp_sensors/ssp_spi.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/= ssp_sensors/ssp_spi.c index 87a38002b218..9df94bd02e3a 100644 --- a/drivers/iio/common/ssp_sensors/ssp_spi.c +++ b/drivers/iio/common/ssp_sensors/ssp_spi.c @@ -326,7 +326,6 @@ static int ssp_parse_dataframe(struct ssp_data *data, c= har *dataframe, int len) /* threaded irq */ int ssp_irq_msg(struct ssp_data *data) { - char *buffer; u8 msg_type; int ret; u16 length, msg_options; @@ -370,7 +369,7 @@ int ssp_irq_msg(struct ssp_data *data) * but the slave should not send such ones - it is to * check but let's handle this */ - buffer =3D kmalloc(length, GFP_KERNEL | GFP_DMA); + char *buffer __free(kfree) =3D kmalloc(length, GFP_KERNEL | GFP_DMA); if (!buffer) return -ENOMEM; =20 @@ -379,8 +378,6 @@ int ssp_irq_msg(struct ssp_data *data) if (ret >=3D 0) ret =3D -EPROTO; =20 - kfree(buffer); - dev_err(SSP_DEV, "No match error %x\n", msg_options); =20 @@ -411,22 +408,17 @@ int ssp_irq_msg(struct ssp_data *data) complete(msg->done); break; case SSP_HUB2AP_WRITE: - buffer =3D kzalloc(length, GFP_KERNEL | GFP_DMA); + char *buffer __free(kfree) =3D kzalloc(length, GFP_KERNEL | GFP_DMA); if (!buffer) return -ENOMEM; =20 ret =3D spi_read(data->spi, buffer, length); if (ret < 0) { dev_err(SSP_DEV, "spi read fail\n"); - kfree(buffer); break; } =20 - ret =3D ssp_parse_dataframe(data, buffer, length); - - kfree(buffer); - break; - + return ssp_parse_dataframe(data, buffer, length); 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Sun, 15 Mar 2026 05:55:24 -0700 (PDT) From: Sanjay Chitroda X-Google-Original-From: Sanjay Chitroda To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org Cc: kees@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, sanjayembeddedse@gmail.com Subject: [PATCH v3 3/3] iio: ssp_sensors: cleanup codestyle warning Date: Sun, 15 Mar 2026 18:25:09 +0530 Message-Id: <20260315125509.857195-4-sanjayembedded@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260315125509.857195-1-sanjayembedded@gmail.com> References: <20260315125509.857195-1-sanjayembedded@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Sanjay Chitroda Reported by checkpatch: FILE: drivers/iio/common/ssp_sensors/ssp_spi.c WARNING: Prefer __packed over __attribute__((__packed__)) +} __attribute__((__packed__)); CHECK: Macro argument '...' may be better as '(...)' to avoid precedence issues Signed-off-by: Sanjay Chitroda --- drivers/iio/common/ssp_sensors/ssp_spi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/= ssp_sensors/ssp_spi.c index 9df94bd02e3a..8a52bfb0e39c 100644 --- a/drivers/iio/common/ssp_sensors/ssp_spi.c +++ b/drivers/iio/common/ssp_sensors/ssp_spi.c @@ -7,7 +7,7 @@ #include "ssp.h" =20 #define SSP_DEV (&data->spi->dev) -#define SSP_GET_MESSAGE_TYPE(data) (data & (3 << SSP_RW)) +#define SSP_GET_MESSAGE_TYPE(data) ((data) & (3 << SSP_RW)) =20 /* * SSP -> AP Instruction @@ -30,7 +30,7 @@ struct ssp_msg_header { __le16 length; __le16 options; __le32 data; -} __attribute__((__packed__)); +} __packed; =20 struct ssp_msg { u16 length; @@ -120,9 +120,9 @@ static inline void ssp_get_buffer(struct ssp_msg *m, un= signed int offset, } =20 #define SSP_GET_BUFFER_AT_INDEX(m, index) \ - (m->buffer[SSP_HEADER_SIZE_ALIGNED + index]) + ((m)->buffer[SSP_HEADER_SIZE_ALIGNED + (index)]) #define SSP_SET_BUFFER_AT_INDEX(m, index, val) \ - (m->buffer[SSP_HEADER_SIZE_ALIGNED + index] =3D val) + ((m)->buffer[SSP_HEADER_SIZE_ALIGNED + (index)] =3D val) =20 static void ssp_clean_msg(struct ssp_msg *m) { --=20 2.34.1