Subject: [PATCH 007/009]: raid10: chunk size check in run

[raz ben yehuda <raziebe@gmail.com>]

have raid10 check chunk size in run method instead of in md
 raid10.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
Signed-off-by: raziebe@gmail.com
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 2405add..52ad64e 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2055,7 +2055,15 @@ static int run(mddev_t *mddev)
 		       "at least PAGE_SIZE(%ld).\n", PAGE_SIZE);
 		return -EINVAL;
 	}
-
+	/*
+	 * chunk-size has to be a power of 2
+	 */
+	if ((1 << ffz(~mddev->chunk_size)) != mddev->chunk_size) {
+		printk(KERN_ERR "%s chunk_size of %d not valid\n",
+			mdname(mddev),
+			mddev->chunk_size);
+		return -EINVAL;
+	}
 	nc = mddev->layout & 255;
 	fc = (mddev->layout >> 8) & 255;
 	fo = mddev->layout & (1<<16);