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staging: comedi: pass subdevice to comedi_buf_write_n_allocated() 

Change the parameters of `comedi_buf_write_n_allocated()` 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>
This commit is contained in:
Ian Abbott 2014-05-06 13:12:06 +01:00 committed by Greg Kroah-Hartman
parent 940dd35d58
commit 0f1f34e844
3 changed files with 8 additions and 6 deletions
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6
drivers/staging/comedi/comedi_buf.c
View File

@ -323,8 +323,10 @@ static unsigned int comedi_buf_munge(struct comedi_async *async,
return count;
}
unsigned int comedi_buf_write_n_allocated(struct comedi_async *async)
unsigned int comedi_buf_write_n_allocated(struct comedi_subdevice *s)
{
struct comedi_async *async = s->async;
return async->buf_write_alloc_count - async->buf_write_count;
}
@ -333,7 +335,7 @@ unsigned int comedi_buf_write_free(struct comedi_subdevice *s,
unsigned int nbytes)
{
struct comedi_async *async = s->async;
unsigned int allocated = comedi_buf_write_n_allocated(async);
unsigned int allocated = comedi_buf_write_n_allocated(s);
if (nbytes > allocated)
nbytes = allocated;

6
drivers/staging/comedi/comedi_fops.c
View File

@ -2040,7 +2040,7 @@ static unsigned int comedi_poll(struct file *file, poll_table *wait)
poll_wait(file, &s->async->wait_head, wait);
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)
comedi_buf_write_n_allocated(s) >= bps)
mask |= POLLOUT | POLLWRNORM;
}
@ -2137,8 +2137,8 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
if (async->buf_write_ptr + m > async->prealloc_bufsz)
m = async->prealloc_bufsz - async->buf_write_ptr;
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 > comedi_buf_write_n_allocated(s))
m = comedi_buf_write_n_allocated(s);
if (m < n)
n = m;

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

@ -21,7 +21,7 @@ void comedi_buf_map_get(struct comedi_buf_map *bm);
int comedi_buf_map_put(struct comedi_buf_map *bm);
struct comedi_buf_map *comedi_buf_map_from_subdev_get(
struct comedi_subdevice *s);
unsigned int comedi_buf_write_n_allocated(struct comedi_async *async);
unsigned int comedi_buf_write_n_allocated(struct comedi_subdevice *s);
void comedi_device_cancel_all(struct comedi_device *dev);
extern unsigned int comedi_default_buf_size_kb;