From 3c91ee6964114b1a4f54ae6b397c889576d91cf4 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 18 May 2017 15:33:29 +0200 Subject: [PATCH] Btrfs: work around maybe-uninitialized warning A rewrite of btrfs_submit_direct_hook appears to have introduced a warning: fs/btrfs/inode.c: In function 'btrfs_submit_direct_hook': fs/btrfs/inode.c:8467:14: error: 'bio' may be used uninitialized in this function [-Werror=maybe-uninitialized] Where the 'bio' variable was previously initialized unconditionally, it is now set in the "while (submit_len > 0)" loop that would never execute if submit_len is zero. Assuming this cannot happen in practice, we can avoid the warning by simply replacing the while{} loop with a do{}while() loop so the compiler knows that it will always be entered at least once. Fixes changes introduced in "Btrfs: use bio_clone_bioset_partial to simplify DIO submit". Signed-off-by: Arnd Bergmann Signed-off-by: David Sterba --- fs/btrfs/inode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 53f2cf4b24b6..93f1b31199d2 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -8507,7 +8507,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip, /* bio split */ ASSERT(map_length <= INT_MAX); atomic_inc(&dip->pending_bios); - while (submit_len > 0) { + do { clone_len = min_t(int, submit_len, map_length); /* @@ -8550,7 +8550,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip, start_sector << 9, &map_length, NULL, 0); if (ret) goto out_err; - } + } while (submit_len > 0); submit: ret = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum, -- 2.11.0