1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index fdd6ae859397..bccb4b1ffc46 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -48,11 +48,11 @@ static LIST_HEAD(mtd_notifiers);
  */
 static void mtd_release(struct device *dev)
 {
-        struct mtd_info *mtd = dev_to_mtd(dev);
+        dev_t index = MTD_DEVT(dev_to_mtd(dev)->index);
 
         /* remove /dev/mtdXro node if needed */
-        if (MTD_DEVT(mtd->index))
-                device_destroy(mtd_class, MTD_DEVT(mtd->index) + 1);
+        if (index)
+                device_destroy(mtd_class, index + 1);
 }
 
 static ssize_t mtd_type_show(struct device *dev,
@@ -132,6 +132,17 @@ static ssize_t mtd_writesize_show(struct device *dev,
 }
 static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL);
 
+static ssize_t mtd_subpagesize_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mtd_info *mtd = dev_to_mtd(dev);
+        unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize);
+
+}
+static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL);
+
 static ssize_t mtd_oobsize_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -169,6 +180,7 @@ static struct attribute *mtd_attrs[] = {
         &dev_attr_size.attr,
         &dev_attr_erasesize.attr,
         &dev_attr_writesize.attr,
+        &dev_attr_subpagesize.attr,
         &dev_attr_oobsize.attr,
         &dev_attr_numeraseregions.attr,
         &dev_attr_name.attr,