[PATCH] sysfs and driver core: add callback helper, used by SCSI and S390
This patch (as868) adds a helper routine for device drivers that need
to set up a callback to perform some action in a different process's
context. This is intended for use by attribute methods that want to
unregister themselves or their parent device. Attribute method calls
are mutually exclusive with unregistration, so such actions cannot be
taken directly.
Two attribute methods are converted to use the new helper routine: one
for SCSI device deletion and one for System/390 ccwgroup devices.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 523405e..0544edd 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -78,6 +78,9 @@
#ifdef CONFIG_SYSFS
+extern int sysfs_schedule_callback(struct kobject *kobj,
+ void (*func)(void *), void *data);
+
extern int __must_check
sysfs_create_dir(struct kobject *, struct dentry *);
@@ -132,6 +135,12 @@
#else /* CONFIG_SYSFS */
+static inline int sysfs_schedule_callback(struct kobject *kobj,
+ void (*func)(void *), void *data)
+{
+ return -ENOSYS;
+}
+
static inline int sysfs_create_dir(struct kobject * k, struct dentry *shadow)
{
return 0;