usb/core: Added devspec sysfs entry for devices behind the usb hub

Grub finds incorrect of_node path for devices behind usb hub.
Added devspec sysfs entry for devices behind usb hub so that
right of_node path is returned during grub sysfs walk for these
devices.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index c953a0f1c69513a066ceab7bb7372f946b19e8ed..84d66d57319619fce52fb7c05a443dd3d45c809f 100644 (file)
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -14,6 +14,7 @@
 #include <linux/string.h>
 #include <linux/usb.h>
 #include <linux/usb/quirks.h>
+#include <linux/of.h>
 #include "usb.h"
 
 /* Active configuration fields */
@@ -104,6 +105,17 @@ static ssize_t bConfigurationValue_store(struct device *dev,
 static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
                bConfigurationValue_show, bConfigurationValue_store);
 
+#ifdef CONFIG_OF
+static ssize_t devspec_show(struct device *dev, struct device_attribute *attr,
+                           char *buf)
+{
+       struct device_node *of_node = dev->of_node;
+
+       return sprintf(buf, "%s\n", of_node_full_name(of_node));
+}
+static DEVICE_ATTR_RO(devspec);
+#endif
+
 /* String fields */
 #define usb_string_attr(name)                                          \
 static ssize_t  name##_show(struct device *dev,                                \
@@ -786,6 +798,9 @@ static struct attribute *dev_attrs[] = {
        &dev_attr_remove.attr,
        &dev_attr_removable.attr,
        &dev_attr_ltm_capable.attr,
+#ifdef CONFIG_OF
+       &dev_attr_devspec.attr,
+#endif
        NULL,
 };
 static struct attribute_group dev_attr_grp = {