[PATCH 1/3] staging: comedi: fix auto-unconfig kernel error

[Bernd Porr]

Merging the un-registering of both the subdevices and the
main comedi device into one function and the module which
actually associated with it. The kernel oops observed before
was because the main device was un-registered first and
then the subdevices which were then no longer valid.
This has been also tested with 'comedi_config -r' for
both autoconfigured and legacy devices.

Signed-off-by: Bernd Porr <mail at berndporr.me.uk>
---
 drivers/staging/comedi/comedi_fops.c | 19 +++++++++++++++++++
 drivers/staging/comedi/drivers.c     | 18 ------------------
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index f3d59e2..2680b72 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -141,7 +141,26 @@ static struct comedi_device *comedi_clear_board_minor(unsigned minor)
 
 static void comedi_free_board_dev(struct comedi_device *dev)
 {
+	int i;
+	struct comedi_subdevice *s;
+
 	if (dev) {
+		if (dev->subdevices) {
+			for (i = 0; i < dev->n_subdevices; i++) {
+				s = &dev->subdevices[i];
+				if (s->runflags & SRF_FREE_SPRIV)
+					kfree(s->private);
+				comedi_free_subdevice_minor(s);
+				if (s->async) {
+					comedi_buf_alloc(dev, s, 0);
+					kfree(s->async);
+				}
+			}
+			kfree(dev->subdevices);
+			dev->subdevices = NULL;
+			dev->n_subdevices = 0;
+		}
+
 		if (dev->class_dev) {
 			device_destroy(comedi_class,
 				       MKDEV(COMEDI_MAJOR, dev->minor));
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
index 4964d2a..d6dc58a 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -97,24 +97,6 @@ EXPORT_SYMBOL_GPL(comedi_alloc_subdevices);
 
 static void cleanup_device(struct comedi_device *dev)
 {
-	int i;
-	struct comedi_subdevice *s;
-
-	if (dev->subdevices) {
-		for (i = 0; i < dev->n_subdevices; i++) {
-			s = &dev->subdevices[i];
-			if (s->runflags & SRF_FREE_SPRIV)
-				kfree(s->private);
-			comedi_free_subdevice_minor(s);
-			if (s->async) {
-				comedi_buf_alloc(dev, s, 0);
-				kfree(s->async);
-			}
-		}
-		kfree(dev->subdevices);
-		dev->subdevices = NULL;
-		dev->n_subdevices = 0;
-	}
 	kfree(dev->private);
 	dev->private = NULL;
 	dev->driver = NULL;
-- 
1.8.5.2