linux-kernel - [PATCH] iio: adc: ad_sigma_delta: change to buffer predisable

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Message-Id: <20250703-iio-adc-ad_sigma_delta-buffer-predisable-v1-1-f2ab85138f1f@baylibre.com>
Date: Thu, 03 Jul 2025 16:07:44 -0500
From: David Lechner <dlechner@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH] iio: adc: ad_sigma_delta: change to buffer predisable

Change the buffer disable callback from postdisable to predisable.
This balances the existing posteanble callback. Using postdisable
with posteanble can be problematic, for example, if update_scan_mode
fails, it would call postdisable without ever having called posteanble,
so the drivers using this would be in an unexpected state when
postdisable was called.

Fixes: af3008485ea0 ("iio:adc: Add common code for ADI Sigma Delta devices")
Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad_sigma_delta.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index 4c5f8d29a559fea7226b84141bcb148fb801f62c..1a2ee7c7f65afc60677af9f3138e59f6476f74c7 100644
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -520,7 +520,7 @@ static int ad_sd_buffer_postenable(struct iio_dev *indio_dev)
 	return ret;
 }
 
-static int ad_sd_buffer_postdisable(struct iio_dev *indio_dev)
+static int ad_sd_buffer_predisable(struct iio_dev *indio_dev)
 {
 	struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
 
@@ -644,7 +644,7 @@ static bool ad_sd_validate_scan_mask(struct iio_dev *indio_dev, const unsigned l
 
 static const struct iio_buffer_setup_ops ad_sd_buffer_setup_ops = {
 	.postenable = &ad_sd_buffer_postenable,
-	.postdisable = &ad_sd_buffer_postdisable,
+	.predisable = &ad_sd_buffer_predisable,
 	.validate_scan_mask = &ad_sd_validate_scan_mask,
 };
 

---
base-commit: 6742eff60460e77158d4f1b233f17e0345c9e66a
change-id: 20250703-iio-adc-ad_sigma_delta-buffer-predisable-d10fc1914092

Best regards,
-- 
David Lechner <dlechner@...libre.com>