[RFC] [PATCH] [MTD-UTILS]: flash_lock: fix length being passed

[Vimal Singh]

This patch fixes the 'length' calculation.
Making it:
+       mtdLockInfo.length = (num_sectors - 1) * mtdInfo.erasesize;
Rather:
-       mtdLockInfo.length = num_sectors * mtdInfo.erasesize;

Say there are 240 blocks present in the device. Then:
offset starts from: 0x0
and full size of device: 0x1E00000

doing: 240 * 0x20000 gives -> 0x1E00000
But last block address should be 0x1DE0000 (which spans for 0x20000
bytes, adding upto size of 0x1E00000)

Signed-off-by: Vimal Singh <vimalsingh at ti.com>
---

--- flash_lock.c.org	2009-11-24 19:33:18.000000000 +0530
+++ flash_lock.c	2009-11-24 19:33:13.000000000 +0530
@@ -71,7 +71,7 @@ int main(int argc, char *argv[])
 	}

 	mtdLockInfo.start = ofs;
-	mtdLockInfo.length = num_sectors * mtdInfo.erasesize;
+	mtdLockInfo.length = (num_sectors - 1) * mtdInfo.erasesize;
 	if(ioctl(fd, MEMLOCK, &mtdLockInfo))
 	{
 		fprintf(stderr, "Could not lock MTD device: %s\n", argv[1]);
@@ -81,4 +81,3 @@ int main(int argc, char *argv[])

 	return 0;
 }
-