md: raid10: chunk size check in run

have raid10 check chunk size in run method instead of in md

Signed-off-by: raziebe@gmail.com
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 9a5beb4fd954..06bef686f91b 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2050,9 +2050,10 @@ static int run(mddev_t *mddev)
         int nc, fc, fo;
         sector_t stride, size;
 
-        if (mddev->chunk_size < PAGE_SIZE) {
+        if (mddev->chunk_size < PAGE_SIZE ||
+            !is_power_of_2(mddev->chunk_size)) {
                 printk(KERN_ERR "md/raid10: chunk size must be "
-                       "at least PAGE_SIZE(%ld).\n", PAGE_SIZE);
+                       "at least PAGE_SIZE(%ld) and be a power of 2.\n", PAGE_SIZE);
                 return -EINVAL;
         }