greybus: kernel_ver.h: add sysfs_create_groups() and sysfs_remove_groups()
These functions showed up in 3.12 or so, and we are stuck on 3.10 for
various reasons, so provide backports in kernel_ver.h so that we can
rely on these functions.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
diff --git a/drivers/staging/greybus/kernel_ver.h b/drivers/staging/greybus/kernel_ver.h
index 12b454e..92eb024 100644
--- a/drivers/staging/greybus/kernel_ver.h
+++ b/drivers/staging/greybus/kernel_ver.h
@@ -78,6 +78,8 @@
* it here.
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)
+#include <linux/sysfs.h>
+
#define ATTRIBUTE_GROUPS(name) \
static const struct attribute_group name##_group = { \
.attrs = name##_attrs, \
@@ -86,6 +88,37 @@
&name##_group, \
NULL, \
}
+
+static inline int sysfs_create_groups(struct kobject *kobj,
+ const struct attribute_group **groups)
+{
+ int error = 0;
+ int i;
+
+ if (!groups)
+ return 0;
+
+ for (i = 0; groups[i]; i++) {
+ error = sysfs_create_group(kobj, groups[i]);
+ if (error) {
+ while (--i >= 0)
+ sysfs_remove_group(kobj, groups[i]);
+ break;
+ }
+ }
+ return error;
+}
+
+static inline void sysfs_remove_groups(struct kobject *kobj,
+ const struct attribute_group **groups)
+{
+ int i;
+
+ if (!groups)
+ return;
+ for (i = 0; groups[i]; i++)
+ sysfs_remove_group(kobj, groups[i]);
+}
#endif
#endif /* __GREYBUS_KERNEL_VER_H */