From: Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@kernel.org> To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org Cc: Olivier MOYSAN <olivier.moysan@foss.st.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>, Jonathan Cameron <jic23@kernel.org>, Lars-Peter Clausen <lars@metafoo.de>, Michael Hennerich <Michael.Hennerich@analog.com>, Nuno Sa <nuno.sa@analog.com> Subject: [PATCH 06/12] iio: adc: ad9467: add mutex to struct ad9467_state Date: Tue, 21 Nov 2023 11:20:19 +0100 [thread overview] Message-ID: <20231121-dev-iio-backend-v1-6-6a3d542eba35@analog.com> (raw) In-Reply-To: <20231121-dev-iio-backend-v1-0-6a3d542eba35@analog.com> From: Nuno Sa <nuno.sa@analog.com> When calling ad9467_set_scale(), multiple calls to ad9467_spi_write() are done which means we need to properly protect the whole operation so we are sure we will be in a sane state if two concurrent calls occur. Fixes: ad6797120238 ("iio: adc: ad9467: add support AD9467 ADC") Signed-off-by: Nuno Sa <nuno.sa@analog.com> --- drivers/iio/adc/ad9467.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index 04474dbfa631..91821dee03b7 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -4,7 +4,7 @@ * * Copyright 2012-2020 Analog Devices Inc. */ - +#include <linux/cleanup.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/device.h> @@ -122,6 +122,8 @@ struct ad9467_state { unsigned int output_mode; struct gpio_desc *pwrdown_gpio; + /* protect against concurrent accesses to the device */ + struct mutex lock; }; static int ad9467_spi_read(struct spi_device *spi, unsigned int reg) @@ -162,6 +164,7 @@ static int ad9467_reg_access(struct adi_axi_adc_conv *conv, unsigned int reg, int ret; if (!readval) { + guard(mutex)(&st->lock); ret = ad9467_spi_write(spi, reg, writeval); if (ret) return ret; @@ -310,6 +313,7 @@ static int ad9467_set_scale(struct adi_axi_adc_conv *conv, int val, int val2) if (scale_val[0] != val || scale_val[1] != val2) continue; + guard(mutex)(&st->lock); ret = ad9467_spi_write(st->spi, AN877_ADC_REG_VREF, info->scale_table[i][1]); if (ret < 0) -- 2.42.1
WARNING: multiple messages have this Message-ID (diff)
From: Nuno Sa <nuno.sa@analog.com> To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org Cc: Olivier MOYSAN <olivier.moysan@foss.st.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>, Jonathan Cameron <jic23@kernel.org>, Lars-Peter Clausen <lars@metafoo.de>, Michael Hennerich <Michael.Hennerich@analog.com>, Nuno Sa <nuno.sa@analog.com> Subject: [PATCH 06/12] iio: adc: ad9467: add mutex to struct ad9467_state Date: Tue, 21 Nov 2023 11:20:19 +0100 [thread overview] Message-ID: <20231121-dev-iio-backend-v1-6-6a3d542eba35@analog.com> (raw) In-Reply-To: <20231121-dev-iio-backend-v1-0-6a3d542eba35@analog.com> When calling ad9467_set_scale(), multiple calls to ad9467_spi_write() are done which means we need to properly protect the whole operation so we are sure we will be in a sane state if two concurrent calls occur. Fixes: ad6797120238 ("iio: adc: ad9467: add support AD9467 ADC") Signed-off-by: Nuno Sa <nuno.sa@analog.com> --- drivers/iio/adc/ad9467.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index 04474dbfa631..91821dee03b7 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -4,7 +4,7 @@ * * Copyright 2012-2020 Analog Devices Inc. */ - +#include <linux/cleanup.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/device.h> @@ -122,6 +122,8 @@ struct ad9467_state { unsigned int output_mode; struct gpio_desc *pwrdown_gpio; + /* protect against concurrent accesses to the device */ + struct mutex lock; }; static int ad9467_spi_read(struct spi_device *spi, unsigned int reg) @@ -162,6 +164,7 @@ static int ad9467_reg_access(struct adi_axi_adc_conv *conv, unsigned int reg, int ret; if (!readval) { + guard(mutex)(&st->lock); ret = ad9467_spi_write(spi, reg, writeval); if (ret) return ret; @@ -310,6 +313,7 @@ static int ad9467_set_scale(struct adi_axi_adc_conv *conv, int val, int val2) if (scale_val[0] != val || scale_val[1] != val2) continue; + guard(mutex)(&st->lock); ret = ad9467_spi_write(st->spi, AN877_ADC_REG_VREF, info->scale_table[i][1]); if (ret < 0) -- 2.42.1
next prev parent reply other threads:[~2023-11-21 10:17 UTC|newest] Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-21 10:20 [PATCH 00/12] iio: add new backend framework Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-21 10:20 ` [PATCH 01/12] driver: core: allow modifying device_links flags Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-21 10:20 ` [PATCH 02/12] of: property: add device link support for io-backends Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-21 10:20 ` [PATCH 03/12] iio: add the IIO backend framework Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-12-04 15:38 ` Jonathan Cameron 2023-12-06 12:05 ` Nuno Sá 2023-12-06 17:15 ` Jonathan Cameron 2023-11-21 10:20 ` [PATCH 04/12] iio: adc: ad9467: fix reset gpio handling Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-30 21:41 ` David Lechner 2023-12-01 8:47 ` Nuno Sá 2023-12-01 17:01 ` David Lechner 2023-12-02 8:36 ` Nuno Sá 2023-12-04 15:15 ` Jonathan Cameron 2023-12-04 16:41 ` Nuno Sá 2023-11-21 10:20 ` [PATCH 05/12] iio: adc: ad9467: don't ignore error codes Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-30 21:44 ` David Lechner 2023-12-01 8:47 ` Nuno Sá 2023-12-04 15:19 ` Jonathan Cameron 2023-11-21 10:20 ` Nuno Sa via B4 Relay [this message] 2023-11-21 10:20 ` [PATCH 06/12] iio: adc: ad9467: add mutex to struct ad9467_state Nuno Sa 2023-11-30 21:50 ` David Lechner 2023-12-01 8:49 ` Nuno Sá 2023-12-04 15:21 ` Jonathan Cameron 2023-12-04 15:23 ` Jonathan Cameron 2023-12-04 16:10 ` Nuno Sá 2023-12-04 16:51 ` Jonathan Cameron 2023-11-21 10:20 ` [PATCH 07/12] iio: adc: ad9467: fix scale setting Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-21 10:20 ` [PATCH 08/12] iio: adc: ad9467: use spi_get_device_match_data() Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-21 10:20 ` [PATCH 09/12] iio: adc: ad9467: use chip_info variables instead of array Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-12-04 15:25 ` Jonathan Cameron 2023-12-04 16:24 ` Nuno Sá 2023-11-21 10:20 ` [PATCH 10/12] iio: adc: ad9467: convert to backend framework Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-22 0:54 ` kernel test robot 2023-11-30 23:30 ` David Lechner 2023-12-01 0:12 ` David Lechner 2023-12-01 9:08 ` Nuno Sá 2023-12-01 17:44 ` David Lechner 2023-12-02 8:46 ` Nuno Sá 2023-12-04 8:56 ` Nuno Sá 2023-12-04 15:48 ` Jonathan Cameron 2023-12-04 16:23 ` Nuno Sá 2023-12-04 16:57 ` Jonathan Cameron 2023-12-01 9:17 ` Nuno Sá 2023-11-21 10:20 ` [PATCH 11/12] iio: adc: adi-axi-adc: convert to regmap Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-12-04 15:51 ` Jonathan Cameron 2023-12-04 16:15 ` Nuno Sá 2023-11-21 10:20 ` [PATCH 12/12] iio: adc: adi-axi-adc: move to backend framework Nuno Sa via B4 Relay 2023-11-21 10:20 ` Nuno Sa 2023-11-21 23:27 ` kernel test robot 2023-11-25 7:42 ` kernel test robot 2023-11-30 23:33 ` David Lechner 2023-12-01 8:50 ` Nuno Sá 2023-11-23 17:36 ` [PATCH 00/12] iio: add new " Olivier MOYSAN 2023-11-24 9:15 ` Nuno Sá 2023-11-30 23:54 ` David Lechner 2023-12-01 8:41 ` Nuno Sá 2023-12-01 9:14 ` Nuno Sá 2023-12-02 3:53 ` David Lechner 2023-12-02 9:37 ` Nuno Sá 2023-12-02 16:16 ` David Lechner 2023-12-04 14:49 ` Jonathan Cameron
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