linux-kernel - [PATCH 4.9 24/87] iio: proximity: sx9500: claim direct mode during raw proximity reads

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Date:   Mon, 13 Nov 2017 13:55:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alison Schofield <amsfield22@...il.com>,
        Vlad Dogaru <ddvlad@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 24/87] iio: proximity: sx9500: claim direct mode during raw proximity reads

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alison Schofield <amsfield22@...il.com>


[ Upstream commit 6b2e7589b82ff534dd5c6d67dd83c53f13691bec ]

Driver was checking for direct mode but not locking it.  Use the
claim/release helper functions to guarantee the device stays in
direct mode during raw reads of proximity data.

Signed-off-by: Alison Schofield <amsfield22@...il.com>
Reviewed-by: Vlad Dogaru <ddvlad@...il.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/proximity/sx9500.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/iio/proximity/sx9500.c
+++ b/drivers/iio/proximity/sx9500.c
@@ -387,14 +387,18 @@ static int sx9500_read_raw(struct iio_de
 			   int *val, int *val2, long mask)
 {
 	struct sx9500_data *data = iio_priv(indio_dev);
+	int ret;
 
 	switch (chan->type) {
 	case IIO_PROXIMITY:
 		switch (mask) {
 		case IIO_CHAN_INFO_RAW:
-			if (iio_buffer_enabled(indio_dev))
-				return -EBUSY;
-			return sx9500_read_proximity(data, chan, val);
+			ret = iio_device_claim_direct_mode(indio_dev);
+			if (ret)
+				return ret;
+			ret = sx9500_read_proximity(data, chan, val);
+			iio_device_release_direct_mode(indio_dev);
+			return ret;
 		case IIO_CHAN_INFO_SAMP_FREQ:
 			return sx9500_read_samp_freq(data, val, val2);
 		default: