mtd: add MEMERASE64 ioctl for >4GiB devices

New MEMERASE/MEMREADOOB/MEMWRITEOOB ioctls are needed in order to support
64-bit offsets into large NAND flash devices.

Signed-off-by: Kevin Cernekee <kpc.mtd@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 21 insertions, 8 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 763d3f0a1f42..ad4b8618977d 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -417,6 +417,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
                 break;
 
         case MEMERASE:
+        case MEMERASE64:
         {
                 struct erase_info *erase;
 
@@ -427,20 +428,32 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
                 if (!erase)
                         ret = -ENOMEM;
                 else {
-                        struct erase_info_user einfo;
-
                         wait_queue_head_t waitq;
                         DECLARE_WAITQUEUE(wait, current);
 
                         init_waitqueue_head(&waitq);
 
-                        if (copy_from_user(&einfo, argp,
-                                    sizeof(struct erase_info_user))) {
-                                kfree(erase);
-                                return -EFAULT;
+                        if (cmd == MEMERASE64) {
+                                struct erase_info_user64 einfo64;
+
+                                if (copy_from_user(&einfo64, argp,
+                                            sizeof(struct erase_info_user64))) {
+                                        kfree(erase);
+                                        return -EFAULT;
+                                }
+                                erase->addr = einfo64.start;
+                                erase->len = einfo64.length;
+                        } else {
+                                struct erase_info_user einfo32;
+
+                                if (copy_from_user(&einfo32, argp,
+                                            sizeof(struct erase_info_user))) {
+                                        kfree(erase);
+                                        return -EFAULT;
+                                }
+                                erase->addr = einfo32.start;
+                                erase->len = einfo32.length;
                         }
-                        erase->addr = einfo.start;
-                        erase->len = einfo.length;
                         erase->mtd = mtd;
                         erase->callback = mtdchar_erase_callback;
                         erase->priv = (unsigned long)&waitq;