linux-kernel - [PATCH 5.14 074/151] iio: adis16475: fix deadlock on frequency set

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Date:   Mon, 18 Oct 2021 15:24:13 +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,
        Nuno Sá <nuno.sa@...log.com>,
        Alexandru Ardelean <ardeleanalex@...il.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.14 074/151] iio: adis16475: fix deadlock on frequency set

From: Nuno Sá <nuno.sa@...log.com>

commit 9da1b86865ab4376408c58cd9fec332c8bdb5c73 upstream.

With commit 39c024b51b560
("iio: adis16475: improve sync scale mode handling"), two deadlocks were
introduced:
 1) The call to 'adis_write_reg_16()' was not changed to it's unlocked
    version.
 2) The lock was not being released on the success path of the function.

This change fixes both these issues.

Fixes: 39c024b51b560 ("iio: adis16475: improve sync scale mode handling")
Signed-off-by: Nuno Sá <nuno.sa@...log.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@...il.com>
Link: https://lore.kernel.org/r/20210920090047.74903-1-nuno.sa@analog.com
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/imu/adis16475.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/iio/imu/adis16475.c
+++ b/drivers/iio/imu/adis16475.c
@@ -353,10 +353,11 @@ static int adis16475_set_freq(struct adi
 	if (dec > st->info->max_dec)
 		dec = st->info->max_dec;
 
-	ret = adis_write_reg_16(&st->adis, ADIS16475_REG_DEC_RATE, dec);
+	ret = __adis_write_reg_16(&st->adis, ADIS16475_REG_DEC_RATE, dec);
 	if (ret)
 		goto error;
 
+	adis_dev_unlock(&st->adis);
 	/*
 	 * If decimation is used, then gyro and accel data will have meaningful
 	 * bits on the LSB registers. This info is used on the trigger handler.