[PATCH] ubi : generate random image_seq when attaching empty MTD device

[Matthieu CASTET <matthieu.castet@parrot.com>]

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generate random image_seq when attaching empty MTD device (kernel do the 
ubi formating).

Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>

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diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index aed19f3..7a95ff3 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -44,6 +44,7 @@
 #include <linux/slab.h>
 #include <linux/crc32.h>
 #include <linux/math64.h>
+#include <linux/random.h>
 #include "ubi.h"
 
 #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
@@ -935,8 +936,10 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
 	if (si->ec_count)
 		si->mean_ec = div_u64(si->ec_sum, si->ec_count);
 
-	if (si->is_empty)
+	if (si->is_empty) {
 		ubi_msg("empty MTD device detected");
+		get_random_bytes(&ubi->image_seq, sizeof(ubi->image_seq));
+	}
 
 	/*
 	 * Few corrupted PEBs are not a problem and may be just a result of