diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 41d1d7c..499d8a4 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -105,7 +105,6 @@ static int check_compressed_csum(struct inode *inode,
 				 u64 disk_start)
 {
 	int ret;
-	struct btrfs_root *root = BTRFS_I(inode)->root;
 	struct page *page;
 	unsigned long i;
 	char *kaddr;
@@ -120,7 +119,7 @@ static int check_compressed_csum(struct inode *inode,
 		csum = ~(u32)0;

 		kaddr = kmap_atomic(page, KM_USER0);
-		csum = btrfs_csum_data(root, kaddr, csum, PAGE_CACHE_SIZE);
+		csum = btrfs_csum_data(kaddr, csum, PAGE_CACHE_SIZE);
 		btrfs_csum_final(csum, (char *)&csum);
 		kunmap_atomic(kaddr, KM_USER0);

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index fe5aec9..77fee13 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -192,7 +192,7 @@ out:
 	return em;
 }

-u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
+u32 btrfs_csum_data(char *data, u32 seed, size_t len)
 {
 	return crc32c(seed, data, len);
 }
@@ -231,7 +231,7 @@ static int csum_tree_block(struct btrfs_root
*root, struct extent_buffer *buf,
 		if (err)
 			return 1;
 		cur_len = min(len, map_len - (offset - map_start));
-		crc = btrfs_csum_data(root, kaddr + offset - map_start,
+		crc = btrfs_csum_data(kaddr + offset - map_start,
 				      crc, cur_len);
 		len -= cur_len;
 		offset += cur_len;
@@ -2359,7 +2359,7 @@ static int write_dev_supers(struct btrfs_device *device,
 			btrfs_set_super_bytenr(sb, bytenr);

 			crc = ~(u32)0;
-			crc = btrfs_csum_data(NULL, (char *)sb +
+			crc = btrfs_csum_data((char *)sb +
 					      BTRFS_CSUM_SIZE, crc,
 					      BTRFS_SUPER_INFO_SIZE -
 					      BTRFS_CSUM_SIZE);
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 07b20dc..9bef3e0 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -79,7 +79,7 @@ int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
 int wait_on_tree_block_writeback(struct btrfs_root *root,
 				 struct extent_buffer *buf);
 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
-u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
+u32 btrfs_csum_data(char *data, u32 seed, size_t len);
 void btrfs_csum_final(u32 crc, char *result);
 int btrfs_open_device(struct btrfs_device *dev);
 int btrfs_verify_block_csum(struct btrfs_root *root,
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index a6a9d4e..611a1be 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -432,8 +432,7 @@ int btrfs_csum_one_bio(struct btrfs_root *root,
struct inode *inode,

 		data = kmap_atomic(bvec->bv_page, KM_USER0);
 		sector_sum->sum = ~(u32)0;
-		sector_sum->sum = btrfs_csum_data(root,
-						  data + bvec->bv_offset,
+		sector_sum->sum = btrfs_csum_data(data + bvec->bv_offset,
 						  sector_sum->sum,
 						  bvec->bv_len);
 		kunmap_atomic(data, KM_USER0);
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 63731a1..64ffb39 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -378,7 +378,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,

 		/* First lets check our crc before we do anything fun */
 		cur_crc = ~(u32)0;
-		cur_crc = btrfs_csum_data(root, addr + start_offset, cur_crc,
+		cur_crc = btrfs_csum_data(addr + start_offset, cur_crc,
 					  PAGE_CACHE_SIZE - start_offset);
 		btrfs_csum_final(cur_crc, (char *)&cur_crc);
 		if (cur_crc != *crc) {
@@ -710,7 +710,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
 			entry++;
 		}
 		*crc = ~(u32)0;
-		*crc = btrfs_csum_data(root, addr + start_offset, *crc,
+		*crc = btrfs_csum_data(addr + start_offset, *crc,
 				       PAGE_CACHE_SIZE - start_offset);
 		kunmap(page);

@@ -737,7 +737,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
 		addr = kmap(page);
 		memcpy(addr, entry->bitmap, PAGE_CACHE_SIZE);
 		*crc = ~(u32)0;
-		*crc = btrfs_csum_data(root, addr, *crc, PAGE_CACHE_SIZE);
+		*crc = btrfs_csum_data(addr, *crc, PAGE_CACHE_SIZE);
 		kunmap(page);
 		btrfs_csum_final(*crc, (char *)crc);
 		crc++;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 870869a..9aa2103 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1989,7 +1989,7 @@ static int btrfs_readpage_end_io_hook(struct
page *page, u64 start, u64 end,
 	if (ret)
 		goto zeroit;

-	csum = btrfs_csum_data(root, kaddr + offset, csum,  end - start + 1);
+	csum = btrfs_csum_data(kaddr + offset, csum,  end - start + 1);
 	btrfs_csum_final(csum, (char *)&csum);
 	if (csum != private)
