mtd: add an ioctl to query the lock status of a flash sector

This patchs adds a way for user space programs to find out whether a
flash sector is locked. An optional driver method in the mtd_info struct
provides the information.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 8b223c0343ee..a8e69dd2b2e4 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -676,6 +676,20 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
                 break;
         }
 
+        case MEMISLOCKED:
+        {
+                struct erase_info_user einfo;
+
+                if (copy_from_user(&einfo, argp, sizeof(einfo)))
+                        return -EFAULT;
+
+                if (!mtd->is_locked)
+                        ret = -EOPNOTSUPP;
+                else
+                        ret = mtd->is_locked(mtd, einfo.start, einfo.length);
+                break;
+        }
+
         /* Legacy interface */
         case MEMGETOOBSEL:
         {