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staging: comedi: add 'pacer' member to struct comedi_device

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Add a new member to the comedi_device struct for a comedi_8254 'pacer'. This
provides a convient place to store the data allocated by the comedi_8254 module
for boards that use an 8254 device to create the data acquisition pacer clock.

Automatically free this pointer in comedi_device_detach_cleanup() so that the
drivers don't need to do it when then are detached.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2015-02-23 14:57:29 -07:00 committed by Greg Kroah-Hartman
parent d42b5211d8
commit 43db062afe
2 changed files with 3 additions and 0 deletions
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1
drivers/staging/comedi/comedidev.h
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@ -256,6 +256,7 @@ struct comedi_driver {
struct comedi_device {
int use_count;
struct comedi_driver *driver;
struct comedi_8254 *pacer;
void *private;
struct device *class_dev;

2
drivers/staging/comedi/drivers.c
View File

@ -139,7 +139,9 @@ static void comedi_device_detach_cleanup(struct comedi_device *dev)
dev->n_subdevices = 0;
}
kfree(dev->private);
kfree(dev->pacer);
dev->private = NULL;
dev->pacer = NULL;
dev->driver = NULL;
dev->board_name = NULL;
dev->board_ptr = NULL;