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Fri, 15 May 2026 10:40:37 -0700 (PDT) From: Sanjay Chitroda X-Google-Original-From: Sanjay Chitroda To: jic23@kernel.org Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, sanjayembeddedse@gmail.com, tglx@kernel.org, christophe.jaillet@wanadoo.fr, mingo@kernel.org, kees@kernel.org, nabijaczleweli@nabijaczleweli.xyz, kyungmin.park@samsung.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 03/12] iio: ssp_sensors: refactor transfer logic into helper Date: Fri, 15 May 2026 23:10:08 +0530 Message-Id: <20260515174017.3962168-4-sanjayembedded@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260515174017.3962168-1-sanjayembedded@gmail.com> References: <20260515174017.3962168-1-sanjayembedded@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Sanjay Chitroda Extract the core transfer logic under comm_lock into a new __ssp_do_transfer() helper. The change is preparatory for converting mutex usage to guard() helpers in subsequent patches. This restructuring simplifies ssp_do_transfer() and makes the transfer flow easier to follow. No functional change intended. Signed-off-by: Sanjay Chitroda --- drivers/iio/common/ssp_sensors/ssp_spi.c | 50 +++++++++++++++--------- 1 file changed, 32 insertions(+), 18 deletions(-) diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/ssp_sensors/ssp_spi.c index 3d377a482161..ebcda6de56c4 100644 --- a/drivers/iio/common/ssp_sensors/ssp_spi.c +++ b/drivers/iio/common/ssp_sensors/ssp_spi.c @@ -196,20 +196,13 @@ static inline void ssp_pending_del(struct ssp_data *data, struct ssp_msg *msg, mutex_unlock(&data->pending_lock); } -static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg, - struct completion *done, int timeout) +static int __ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg, + bool no_irq) { int status; - /* - * check if this is a short one way message or the whole transfer has - * second part after an interrupt - */ - const bool use_no_irq = msg->length == 0; - if (data->shut_down) - return -EPERM; - - msg->done = done; + /* msg->done must be initialized by caller */ + WARN_ON(!msg->done); mutex_lock(&data->comm_lock); @@ -224,15 +217,41 @@ static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg, goto _error_locked; } - ssp_pending_add(data, msg, use_no_irq); + ssp_pending_add(data, msg, no_irq); status = ssp_check_lines(data, true); if (status < 0) { - ssp_pending_del(data, msg, use_no_irq); + ssp_pending_del(data, msg, no_irq); goto _error_locked; } mutex_unlock(&data->comm_lock); + return 0; + +_error_locked: + mutex_unlock(&data->comm_lock); + data->timeout_cnt++; + return status; +} + +static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg, + struct completion *done, int timeout) +{ + int status; + /* + * check if this is a short one way message or the whole transfer has + * second part after an interrupt + */ + const bool use_no_irq = msg->length == 0; + + if (data->shut_down) + return -EPERM; + + msg->done = done; + + status = __ssp_do_transfer(data, msg, use_no_irq); + if (status < 0) + return status; if (!use_no_irq && done && !wait_for_completion_timeout(done, msecs_to_jiffies(timeout))) { @@ -243,11 +262,6 @@ static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg, } return 0; - -_error_locked: - mutex_unlock(&data->comm_lock); - data->timeout_cnt++; - return status; } static inline int ssp_spi_sync_command(struct ssp_data *data, -- 2.34.1