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staging: comedi: mite: pass subdevice to mite_sync_output_dma() 

`mite_sync_output_dma()` in the "mite" module currently takes a pointer
to a `struct comedi_async` and gets a pointer to the owning `struct
comedi_subdevice` from the `subdevice` member.  Change it to take a
pointer to a `struct comedi_subdevice` and use the `async` member.

The motivation for this is to eliminate the `subdevice` member of
`struct comedi_async`.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2014-05-06 13:12:17 +01:00 committed by Greg Kroah-Hartman
parent 74f63db7ae
commit 1e575a9cd9
3 changed files with 6 additions and 7 deletions
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7
drivers/staging/comedi/drivers/mite.c
View File

@ -559,9 +559,9 @@ int mite_sync_input_dma(struct mite_channel *mite_chan,
EXPORT_SYMBOL_GPL(mite_sync_input_dma);
int mite_sync_output_dma(struct mite_channel *mite_chan,
struct comedi_async *async)
struct comedi_subdevice *s)
{
struct comedi_subdevice *s = async->subdevice;
struct comedi_async *async = s->async;
int count;
u32 nbytes_ub, nbytes_lb;
unsigned int old_alloc_count;
@ -579,8 +579,7 @@ int mite_sync_output_dma(struct mite_channel *mite_chan,
(int)(nbytes_ub - stop_count) > 0)
nbytes_ub = stop_count;
if ((int)(nbytes_ub - old_alloc_count) > 0) {
dev_warn(async->subdevice->device->class_dev,
"mite: DMA underrun\n");
dev_warn(s->device->class_dev, "mite: DMA underrun\n");
async->events |= COMEDI_CB_OVERFLOW;
return -1;
}

2
drivers/staging/comedi/drivers/mite.h
View File

@ -108,7 +108,7 @@ void mite_dma_disarm(struct mite_channel *mite_chan);
int mite_sync_input_dma(struct mite_channel *mite_chan,
struct comedi_subdevice *s);
int mite_sync_output_dma(struct mite_channel *mite_chan,
struct comedi_async *async);
struct comedi_subdevice *s);
u32 mite_bytes_written_to_memory_lb(struct mite_channel *mite_chan);
u32 mite_bytes_written_to_memory_ub(struct mite_channel *mite_chan);
u32 mite_bytes_read_from_memory_lb(struct mite_channel *mite_chan);

4
drivers/staging/comedi/drivers/ni_mio_common.c
View File

@ -877,7 +877,7 @@ static void mite_handle_b_linkc(struct mite_struct *mite,
spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
if (devpriv->ao_mite_chan)
mite_sync_output_dma(devpriv->ao_mite_chan, s->async);
mite_sync_output_dma(devpriv->ao_mite_chan, s);
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
}
@ -3640,7 +3640,7 @@ static void handle_cdio_interrupt(struct comedi_device *dev)
devpriv->mite->mite_io_addr +
MITE_CHOR(devpriv->cdo_mite_chan->channel));
}
mite_sync_output_dma(devpriv->cdo_mite_chan, s->async);
mite_sync_output_dma(devpriv->cdo_mite_chan, s);
}
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
#endif