[PATCH] iomap: allocate s_dio_done_wq for async reads as well

[Christoph Hellwig <hch@lst.de>]

Since commit 222f2c7c6d14 ("iomap: always run error completions in user
context"), read error completions are deferred to s_dio_done_wq.  This
means the workqueue also needs to be allocated for async reads.

Fixes: 222f2c7c6d14 ("iomap: always run error completions in user context")
Reported-by: syzbot+a2b9a4ed0d61b1efb3f5@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: syzbot+a2b9a4ed0d61b1efb3f5@syzkaller.appspotmail.com
---
 fs/iomap/direct-io.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index d4e2e328d893..8e273408453a 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -738,12 +738,12 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
 			}
 			goto out_free_dio;
 		}
+	}
 
-		if (!wait_for_completion && !inode->i_sb->s_dio_done_wq) {
-			ret = sb_init_dio_done_wq(inode->i_sb);
-			if (ret < 0)
-				goto out_free_dio;
-		}
+	if (!wait_for_completion && !inode->i_sb->s_dio_done_wq) {
+		ret = sb_init_dio_done_wq(inode->i_sb);
+		if (ret < 0)
+			goto out_free_dio;
 	}
 
 	inode_dio_begin(inode);
-- 
2.47.3