From 202b89f4b778d86a940f693785600acaccca6a2b Mon Sep 17 00:00:00 2001 From: Nuno Sa Date: Fri, 31 May 2024 11:41:54 +0200 Subject: [PATCH] iio: adc: adi-axi-adc: don't allow concurrent enable/disable calls 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: 794ef0e57854 ("iio: adc: adi-axi-adc: move to backend framework") Signed-off-by: Nuno Sa Link: https://lore.kernel.org/r/20240531-dev-axi-adc-drp-v3-1-e3fa79447c67@analog.com Signed-off-by: Jonathan Cameron --- drivers/iio/adc/adi-axi-adc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c index 0cf0d81358fd5..bf51d619ebbc9 100644 --- a/drivers/iio/adc/adi-axi-adc.c +++ b/drivers/iio/adc/adi-axi-adc.c @@ -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); } -- 2.50.1