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iio: dln2-adc: fix iio_triggered_buffer_postenable() position 

[ Upstream commit a7bddfe2df ]

The iio_triggered_buffer_postenable() hook should be called first to
attach the poll function. The iio_triggered_buffer_predisable() hook is
called last (as is it should).

This change moves iio_triggered_buffer_postenable() to be called first. It
adds iio_triggered_buffer_predisable() on the error paths of the postenable
hook.
For the predisable hook, some code-paths have been changed to make sure
that the iio_triggered_buffer_predisable() hook gets called in case there
is an error before it.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Alexandru Ardelean 2019-10-23 11:26:34 +03:00 committed by Greg Kroah-Hartman
parent 86b2eb94b0
commit 8679dce8c6
1 changed files with 14 additions and 6 deletions
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20
drivers/iio/adc/dln2-adc.c
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@ -524,6 +524,10 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
u16 conflict;
unsigned int trigger_chan;
ret = iio_triggered_buffer_postenable(indio_dev);
if (ret)
return ret;
mutex_lock(&dln2->mutex);
/* Enable ADC */
@ -537,6 +541,7 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
(int)conflict);
ret = -EBUSY;
}
iio_triggered_buffer_predisable(indio_dev);
return ret;
}
@ -550,6 +555,7 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
mutex_unlock(&dln2->mutex);
if (ret < 0) {
dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
iio_triggered_buffer_predisable(indio_dev);
return ret;
}
} else {
@ -557,12 +563,12 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
mutex_unlock(&dln2->mutex);
}
return iio_triggered_buffer_postenable(indio_dev);
return 0;
}
static int dln2_adc_triggered_buffer_predisable(struct iio_dev *indio_dev)
{
int ret;
int ret, ret2;
struct dln2_adc *dln2 = iio_priv(indio_dev);
mutex_lock(&dln2->mutex);
@ -577,12 +583,14 @@ static int dln2_adc_triggered_buffer_predisable(struct iio_dev *indio_dev)
ret = dln2_adc_set_port_enabled(dln2, false, NULL);
mutex_unlock(&dln2->mutex);
if (ret < 0) {
if (ret < 0)
dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
return ret;
}
return iio_triggered_buffer_predisable(indio_dev);
ret2 = iio_triggered_buffer_predisable(indio_dev);
if (ret == 0)
ret = ret2;
return ret;
}
static const struct iio_buffer_setup_ops dln2_adc_buffer_setup_ops = {