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iio: adc: adi-axi-adc: don't allow concurrent enable/disable calls

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[ Upstream commit 202b89f4b7 ]

Add proper mutex guards as we should not be able to disable
the core in the middle of enabling it.

Note there's no need to rush in backporting this as the only user of the
backend does not do anything crazy..

Fixes: 794ef0e578 ("iio: adc: adi-axi-adc: move to backend framework")
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240531-dev-axi-adc-drp-v3-1-e3fa79447c67@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nuno Sa 2024-05-31 11:41:54 +02:00 committed by Greg Kroah-Hartman
parent 532248d0f0
commit 9d9029157d
1 changed files with 2 additions and 0 deletions
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2
drivers/iio/adc/adi-axi-adc.c
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@ -85,6 +85,7 @@ static int axi_adc_enable(struct iio_backend *back)
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
int ret;
guard(mutex)(&st->lock);
ret = regmap_set_bits(st->regmap, ADI_AXI_REG_RSTN,
ADI_AXI_REG_RSTN_MMCM_RSTN);
if (ret)
@ -99,6 +100,7 @@ static void axi_adc_disable(struct iio_backend *back)
{
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
guard(mutex)(&st->lock);
regmap_write(st->regmap, ADI_AXI_REG_RSTN, 0);
}