[Skiboot] [PATCH] flash: fix offset and size parameters check

[Cédric Le Goater]

Copying the flash from the host fails :

	# cat /dev/mtd0 > pnor
	cat: /dev/mtd0: Input/output error

and the kernel logs :

	[ 1357.866996] mtd mtd0: opal_flash_async_op(op=0) failed (rc -1)

It seems that the check on the parameters in the opal_flash_op() routine 
are bit excessive and we fail to write or read the last block. 

Here is a fix below which should be enough to catch an out of bounds
operation.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---
 core/flash.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: skiboot.git/core/flash.c
===================================================================
--- skiboot.git.orig/core/flash.c
+++ skiboot.git/core/flash.c
@@ -311,8 +311,7 @@ static int64_t opal_flash_op(enum flash_
 		goto err;
 	}
 
-	if (size >= flash->size || offset >= flash->size
-			|| offset + size >= flash->size) {
+	if (offset + size > flash->size) {
 		rc = OPAL_PARAMETER;
 		goto err;
 	}