staging: comedi: pass subdevice to comedi_buf_write_alloc()

Change the parameters of `comedi_buf_write_alloc()` to pass a pointer to
the comedi subdevice instead of a pointer to the "async" structure
belonging to the subdevice.

The main aim at the moment is to replace all the `struct comedi_async *`
parameters with `struct comedi_subdevice *` parameters in the comedi
driver API.

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/comedi_buf.c

@@ -269,10 +269,10 @@ static unsigned int __comedi_buf_write_alloc(struct comedi_async *async,
 }
 
 /* allocates chunk for the writer from free buffer space */
-unsigned int comedi_buf_write_alloc(struct comedi_async *async,
+unsigned int comedi_buf_write_alloc(struct comedi_subdevice *s,
 				    unsigned int nbytes)
 {
-	return __comedi_buf_write_alloc(async, nbytes, 0);
+	return __comedi_buf_write_alloc(s->async, nbytes, 0);
 }
 EXPORT_SYMBOL_GPL(comedi_buf_write_alloc);
 

drivers/staging/comedi/comedi_fops.c

@@ -1004,7 +1004,7 @@ static int do_bufinfo_ioctl(struct comedi_device *dev,
 
 	if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
 		bi.bytes_written =
-		    comedi_buf_write_alloc(async, bi.bytes_written);
+		    comedi_buf_write_alloc(s, bi.bytes_written);
 		comedi_buf_write_free(async, bi.bytes_written);
 	}
 
@@ -2038,7 +2038,7 @@ static unsigned int comedi_poll(struct file *file, poll_table *wait)
 		unsigned int bps = bytes_per_sample(s);
 
 		poll_wait(file, &s->async->wait_head, wait);
-		comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
+		comedi_buf_write_alloc(s, s->async->prealloc_bufsz);
 		if (!s->busy || !comedi_is_subdevice_running(s) ||
 		    comedi_buf_write_n_allocated(s->async) >= bps)
 			mask |= POLLOUT | POLLWRNORM;
@@ -2136,7 +2136,7 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
 		m = n;
 		if (async->buf_write_ptr + m > async->prealloc_bufsz)
 			m = async->prealloc_bufsz - async->buf_write_ptr;
-		comedi_buf_write_alloc(async, async->prealloc_bufsz);
+		comedi_buf_write_alloc(s, async->prealloc_bufsz);
 		if (m > comedi_buf_write_n_allocated(async))
 			m = comedi_buf_write_n_allocated(async);
 		if (m < n)

drivers/staging/comedi/comedidev.h

@@ -336,7 +336,7 @@ static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
  */
 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
 
-unsigned int comedi_buf_write_alloc(struct comedi_async *, unsigned int);
+unsigned int comedi_buf_write_alloc(struct comedi_subdevice *s, unsigned int n);
 unsigned int comedi_buf_write_free(struct comedi_async *, unsigned int);
 
 unsigned int comedi_buf_read_n_available(struct comedi_async *);

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3200.c

@@ -2702,8 +2702,7 @@ static int i_APCI3200_InterruptHandleEos(struct comedi_device *dev)
 			s->async->events |= COMEDI_CB_EOS;
 
 			/*  Test if enougth memory is available and allocate it for 7 values */
-			/* n = comedi_buf_write_alloc(s->async, 7*sizeof(unsigned int)); */
-			n = comedi_buf_write_alloc(s->async,
+			n = comedi_buf_write_alloc(s,
 				(7 + 12) * sizeof(unsigned int));
 
 			/*  If not enough memory available, event is set to Comedi Buffer Error */

drivers/staging/comedi/drivers/comedi_fc.c

@@ -67,7 +67,7 @@ unsigned int cfc_write_array_to_buffer(struct comedi_subdevice *s,
 	if (num_bytes == 0)
 		return 0;
 
-	retval = comedi_buf_write_alloc(async, num_bytes);
+	retval = comedi_buf_write_alloc(s, num_bytes);
 	if (retval != num_bytes) {
 		dev_warn(s->device->class_dev, "buffer overrun\n");
 		async->events |= COMEDI_CB_OVERFLOW;

drivers/staging/comedi/drivers/mite.c

@@ -533,7 +533,7 @@ int mite_sync_input_dma(struct mite_channel *mite_chan,
 
 	old_alloc_count = async->buf_write_alloc_count;
 	/* write alloc as much as we can */
-	comedi_buf_write_alloc(async, async->prealloc_bufsz);
+	comedi_buf_write_alloc(s, async->prealloc_bufsz);
 
 	nbytes = mite_bytes_written_to_memory_lb(mite_chan);
 	if ((int)(mite_bytes_written_to_memory_ub(mite_chan) -

drivers/staging/comedi/drivers/ni_mio_common.c

@@ -1505,7 +1505,7 @@ static int ni_ai_setup_MITE_dma(struct comedi_device *dev)
 /* printk("comedi_debug: using mite channel %i for ai.\n", devpriv->ai_mite_chan->channel); */
 
 	/* write alloc the entire buffer */
-	comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
+	comedi_buf_write_alloc(s, s->async->prealloc_bufsz);
 
 	spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
 	if (devpriv->ai_mite_chan == NULL) {

drivers/staging/comedi/drivers/ni_pcidio.c

@@ -759,7 +759,7 @@ static int setup_mite_dma(struct comedi_device *dev, struct comedi_subdevice *s)
 		return retval;
 
 	/* write alloc the entire buffer */
-	comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
+	comedi_buf_write_alloc(s, s->async->prealloc_bufsz);
 
 	spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
 	if (devpriv->di_mite_chan) {

drivers/staging/comedi/drivers/ni_tiocmd.c

@@ -125,7 +125,7 @@ static int ni_tio_input_cmd(struct comedi_subdevice *s)
 	int retval = 0;
 
 	/* write alloc the entire buffer */
-	comedi_buf_write_alloc(async, async->prealloc_bufsz);
+	comedi_buf_write_alloc(s, async->prealloc_bufsz);
 	counter->mite_chan->dir = COMEDI_INPUT;
 	switch (counter_dev->variant) {
 	case ni_gpct_variant_m_series: