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-rw-r--r--fs/block_dev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index f02b7bdd9864..742899240872 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -22,6 +22,7 @@
22#include <linux/mount.h> 22#include <linux/mount.h>
23#include <linux/uio.h> 23#include <linux/uio.h>
24#include <linux/namei.h> 24#include <linux/namei.h>
25#include <linux/log2.h>
25#include <asm/uaccess.h> 26#include <asm/uaccess.h>
26#include "internal.h" 27#include "internal.h"
27 28
@@ -67,7 +68,7 @@ static void kill_bdev(struct block_device *bdev)
67int set_blocksize(struct block_device *bdev, int size) 68int set_blocksize(struct block_device *bdev, int size)
68{ 69{
69 /* Size must be a power of two, and between 512 and PAGE_SIZE */ 70 /* Size must be a power of two, and between 512 and PAGE_SIZE */
70 if (size > PAGE_SIZE || size < 512 || (size & (size-1))) 71 if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size))
71 return -EINVAL; 72 return -EINVAL;
72 73
73 /* Size cannot be smaller than the size supported by the device */ 74 /* Size cannot be smaller than the size supported by the device */