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

`mite_sync_input_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>

drivers/staging/comedi/drivers/mite.c

@@ -526,9 +526,9 @@ void mite_dma_disarm(struct mite_channel *mite_chan)
 EXPORT_SYMBOL_GPL(mite_dma_disarm);
 
 int mite_sync_input_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;
 	unsigned int nbytes, old_alloc_count;
 

drivers/staging/comedi/drivers/mite.h

@@ -106,7 +106,7 @@ unsigned mite_dma_tcr(struct mite_channel *mite_chan);
 void mite_dma_arm(struct mite_channel *mite_chan);
 void mite_dma_disarm(struct mite_channel *mite_chan);
 int mite_sync_input_dma(struct mite_channel *mite_chan,
-			struct comedi_async *async);
+			struct comedi_subdevice *s);
 int mite_sync_output_dma(struct mite_channel *mite_chan,
 			 struct comedi_async *async);
 u32 mite_bytes_written_to_memory_lb(struct mite_channel *mite_chan);

drivers/staging/comedi/drivers/ni_660x.c

@@ -823,7 +823,7 @@ static int ni_660x_input_poll(struct comedi_device *dev,
 
 	/* lock to avoid race with comedi_poll */
 	spin_lock_irqsave(&devpriv->interrupt_lock, flags);
-	mite_sync_input_dma(counter->mite_chan, s->async);
+	mite_sync_input_dma(counter->mite_chan, s);
 	spin_unlock_irqrestore(&devpriv->interrupt_lock, flags);
 	return comedi_buf_read_n_available(s);
 }

drivers/staging/comedi/drivers/ni_mio_common.c

@@ -864,7 +864,7 @@ static void ni_sync_ai_dma(struct comedi_device *dev)
 
 	spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
 	if (devpriv->ai_mite_chan)
-		mite_sync_input_dma(devpriv->ai_mite_chan, s->async);
+		mite_sync_input_dma(devpriv->ai_mite_chan, s);
 	spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
 }
 

drivers/staging/comedi/drivers/ni_pcidio.c

@@ -359,7 +359,7 @@ static int ni_pcidio_poll(struct comedi_device *dev, struct comedi_subdevice *s)
 	spin_lock_irqsave(&dev->spinlock, irq_flags);
 	spin_lock(&devpriv->mite_channel_lock);
 	if (devpriv->di_mite_chan)
-		mite_sync_input_dma(devpriv->di_mite_chan, s->async);
+		mite_sync_input_dma(devpriv->di_mite_chan, s);
 	spin_unlock(&devpriv->mite_channel_lock);
 	count = s->async->buf_write_count - s->async->buf_read_count;
 	spin_unlock_irqrestore(&dev->spinlock, irq_flags);
@@ -405,7 +405,7 @@ static irqreturn_t nidio_interrupt(int irq, void *d)
 			writel(CHOR_CLRLC,
 			       mite->mite_io_addr +
 			       MITE_CHOR(devpriv->di_mite_chan->channel));
-			mite_sync_input_dma(devpriv->di_mite_chan, s->async);
+			mite_sync_input_dma(devpriv->di_mite_chan, s);
 			/* XXX need to byteswap */
 		}
 		if (m_status & ~(CHSR_INT | CHSR_LINKC | CHSR_DONE | CHSR_DRDY |

drivers/staging/comedi/drivers/ni_tiocmd.c

@@ -464,7 +464,7 @@ void ni_tio_handle_interrupt(struct ni_gpct *counter,
 		       counter->mite_chan->mite->mite_io_addr +
 		       MITE_CHOR(counter->mite_chan->channel));
 	}
-	mite_sync_input_dma(counter->mite_chan, s->async);
+	mite_sync_input_dma(counter->mite_chan, s);
 	spin_unlock_irqrestore(&counter->lock, flags);
 }
 EXPORT_SYMBOL_GPL(ni_tio_handle_interrupt);