linux-kernel - [PATCH 5.12 083/296] iio: adc: ad7192: Avoid disabling a clock that was never enabled.

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Date:   Mon, 31 May 2021 15:12:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Alexandru Ardelean <ardeleanalex@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        Stable@...r.kernel.org
Subject: [PATCH 5.12 083/296] iio: adc: ad7192: Avoid disabling a clock that was never enabled.

From: Jonathan Cameron <Jonathan.Cameron@...wei.com>

commit e32fe6d90f44922ccbb94016cfc3c238359e3e39 upstream.

Found by inspection.

If the internal clock source is being used, the driver doesn't
call clk_prepare_enable() and as such we should not call
clk_disable_unprepare()

Use the same condition to protect the disable path as is used
on the enable one.  Note this will all get simplified when
the driver moves over to a full devm_ flow, but that would make
backporting the fix harder.

Fix obviously predates move out of staging, but backporting will
become more complex (and is unlikely to happen), hence that patch
is given in the fixes tag.

Alexandru's sign off is here because he added this patch into
a larger series that Jonathan then applied.

Fixes: b581f748cce0 ("staging: iio: adc: ad7192: move out of staging")
Cc: Alexandru Tachici <alexandru.tachici@...log.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@...il.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
Cc: <Stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/adc/ad7192.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -1014,7 +1014,9 @@ static int ad7192_probe(struct spi_devic
 	return 0;
 
 error_disable_clk:
-	clk_disable_unprepare(st->mclk);
+	if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 ||
+	    st->clock_sel == AD7192_CLK_EXT_MCLK2)
+		clk_disable_unprepare(st->mclk);
 error_remove_trigger:
 	ad_sd_cleanup_buffer_and_trigger(indio_dev);
 error_disable_dvdd:
@@ -1031,7 +1033,9 @@ static int ad7192_remove(struct spi_devi
 	struct ad7192_state *st = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
-	clk_disable_unprepare(st->mclk);
+	if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 ||
+	    st->clock_sel == AD7192_CLK_EXT_MCLK2)
+		clk_disable_unprepare(st->mclk);
 	ad_sd_cleanup_buffer_and_trigger(indio_dev);
 
 	regulator_disable(st->dvdd);