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| author | Nuno Sa <nuno.sa@analog.com> | 2023-12-07 15:39:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-01-26 02:35:52 +0300 |
| commit | a98f6c657c607399a46c663b7fb1983c644b2b51 (patch) | |
| tree | 7583bbd7738499c89b37bd8249b1a49726c6f36b | |
| parent | 0c7b8f88315916de2719c0bfbb8e7fd8c68254d6 (diff) | |
| download | linux-a98f6c657c607399a46c663b7fb1983c644b2b51.tar.xz | |
iio: adc: ad9467: add mutex to struct ad9467_state
[ Upstream commit 737720197be445bb9eec2986101e4a386e019337 ]
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>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20231207-iio-backend-prep-v2-3-a4a33bc4d70e@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/iio/adc/ad9467.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index d3c98c4eccd3..104c6d394a3e 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -4,8 +4,9 @@ * * Copyright 2012-2020 Analog Devices Inc. */ - +#include <linux/cleanup.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/slab.h> @@ -121,6 +122,8 @@ struct ad9467_state { unsigned int output_mode; struct gpio_desc *pwrdown_gpio; + /* ensure consistent state obtained on multiple related accesses */ + struct mutex lock; }; static int ad9467_spi_read(struct spi_device *spi, unsigned int reg) @@ -161,6 +164,7 @@ static int ad9467_reg_access(struct adi_axi_adc_conv *conv, unsigned int reg, int ret; if (readval == NULL) { + guard(mutex)(&st->lock); ret = ad9467_spi_write(spi, reg, writeval); if (ret) return ret; @@ -310,6 +314,7 @@ 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) |