From dfc07df0f91a4eabfd3d974e5b1b6b4cfde99e6f Mon Sep 17 00:00:00 2001 From: Alison Schofield Date: Tue, 7 Jun 2016 17:19:05 -0700 Subject: [PATCH] iio: light: gp2ap020a00f: use iio helper function to lock direct mode Replace the code that guarantees the device stays in direct mode with iio_device_claim_direct_mode() which does same. Includes a tiny bit of refactoring (single case -> if) and simplified return flow. Also prevents a theoretical race condition by effectively taking the lock a little earlier than before. Signed-off-by: Alison Schofield Cc: Daniel Baluta Acked-by: Jacek Anaszewski Signed-off-by: Jonathan Cameron --- drivers/iio/light/gp2ap020a00f.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/drivers/iio/light/gp2ap020a00f.c b/drivers/iio/light/gp2ap020a00f.c index 6d41086f7c64..af73af3586a9 100644 --- a/drivers/iio/light/gp2ap020a00f.c +++ b/drivers/iio/light/gp2ap020a00f.c @@ -1287,22 +1287,14 @@ static int gp2ap020a00f_read_raw(struct iio_dev *indio_dev, struct gp2ap020a00f_data *data = iio_priv(indio_dev); int err = -EINVAL; - mutex_lock(&data->lock); - - switch (mask) { - case IIO_CHAN_INFO_RAW: - if (iio_buffer_enabled(indio_dev)) { - err = -EBUSY; - goto error_unlock; - } + if (mask == IIO_CHAN_INFO_RAW) { + err = iio_device_claim_direct_mode(indio_dev); + if (err) + return err; err = gp2ap020a00f_read_channel(data, chan, val); - break; + iio_device_release_direct_mode(indio_dev); } - -error_unlock: - mutex_unlock(&data->lock); - return err < 0 ? err : IIO_VAL_INT; }