[PATCH 2/2] staging/iio/mxs-lradc: fix preenable for multiple buffers

[Jonathan Cameron]

On 05/04/2013 02:19 PM, Michał Mirosław wrote:
> This fixes 'preenable failed: -EINVAL' error when using this driver.
> 
For future patches, please cleanly separate out (in a different series)
the bug fixes from the cleanups.  This one has been applied to the
fixes-togreg branch of iio.git wherease the first patch will go
through the togreg branch and hit one kernel cycle later.

Applied to the fixes-togreg
> Signed-off-by: Michał Mirosław <mirq-linux at rere.qmqm.pl>
> ---
>  drivers/staging/iio/adc/mxs-lradc.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
> index 03299ea..d92c97a 100644
> --- a/drivers/staging/iio/adc/mxs-lradc.c
> +++ b/drivers/staging/iio/adc/mxs-lradc.c
> @@ -690,7 +690,6 @@ static void mxs_lradc_trigger_remove(struct iio_dev *iio)
>  static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
>  {
>  	struct mxs_lradc *lradc = iio_priv(iio);
> -	struct iio_buffer *buffer = iio->buffer;
>  	int ret = 0, chan, ofs = 0;
>  	unsigned long enable = 0;
>  	uint32_t ctrl4_set = 0;
> @@ -698,7 +697,7 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
>  	uint32_t ctrl1_irq = 0;
>  	const uint32_t chan_value = LRADC_CH_ACCUMULATE |
>  		((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> -	const int len = bitmap_weight(buffer->scan_mask, LRADC_MAX_TOTAL_CHANS);
> +	const int len = bitmap_weight(iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS);
>  
>  	if (!len)
>  		return -EINVAL;
> @@ -725,7 +724,7 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
>  		lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>  	writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>  
> -	for_each_set_bit(chan, buffer->scan_mask, LRADC_MAX_TOTAL_CHANS) {
> +	for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
>  		ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
>  		ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
>  		ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
>