driver-core: Add attribute argument to class_attribute show/store

Passing the attribute to the low level IO functions allows all kinds
of cleanups, by sharing low level IO code without requiring
an own function for every piece of data.

Also drivers can extend the attributes with own data fields
and use that in the low level function.

This makes the class attributes the same as sysdev_class attributes
and plain attributes.

This will allow further cleanups in drivers.

Full tree sweep converting all users.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/bluetooth/rfcomm/core.c

@@ -2098,7 +2098,9 @@ static struct hci_cb rfcomm_cb = {
 	.security_cfm	= rfcomm_security_cfm
 };
 
-static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf)
+static ssize_t rfcomm_dlc_sysfs_show(struct class *dev,
+				     struct class_attribute *attr,
+				     char *buf)
 {
 	struct rfcomm_session *s;
 	struct list_head *pp, *p;