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staging: comedi: remove subdevice member of struct comedi_async 

The `async` member of `struct comedi_subdevice` may point to a `struct
comedi_async` or may be NULL.  The `subdevice` member of `struct
comedi_async` points back to the `struct comedi_subdevice` associated
with it in a one-to-one relationship.

All uses of the `subdevice` member of `struct comedi_async` apart from
its initialization have now been removed (by passing around a pointer to
the subdevice instead of to the "async" structure), so get rid of it.

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 13:12:18 +01:00 committed by Greg Kroah-Hartman
parent 1e575a9cd9
commit 2891911a32
2 changed files with 0 additions and 3 deletions
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2
drivers/staging/comedi/comedidev.h
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@ -108,8 +108,6 @@ struct comedi_buf_map {
};
struct comedi_async {
struct comedi_subdevice *subdevice;
void *prealloc_buf; /* pre-allocated buffer */
unsigned int prealloc_bufsz; /* buffer size, in bytes */
struct comedi_buf_map *buf_map; /* map of buffer pages */

1
drivers/staging/comedi/drivers.c
View File

@ -307,7 +307,6 @@ static int __comedi_device_postconfig_async(struct comedi_device *dev,
return -ENOMEM;
init_waitqueue_head(&async->wait_head);
async->subdevice = s;
s->async = async;
async->max_bufsize = comedi_default_buf_maxsize_kb * 1024;