fuse: fix poll notify

Move fuse_copy_finish() to before calling fuse_notify_poll_wakeup().
This is not a big issue because fuse_notify_poll_wakeup() should be
atomic, but it's cleaner this way, and later uses of notification will
need to be able to finish the copying before performing some actions.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

1 files changed, 9 insertions, 4 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index c4a3d9bbdaa8..ba76b68c52ff 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -826,16 +826,21 @@ static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size,
                             struct fuse_copy_state *cs)
 {
         struct fuse_notify_poll_wakeup_out outarg;
-        int err;
+        int err = -EINVAL;
 
         if (size != sizeof(outarg))
-                return -EINVAL;
+                goto err;
 
         err = fuse_copy_one(cs, &outarg, sizeof(outarg));
         if (err)
-                return err;
+                goto err;
 
+        fuse_copy_finish(cs);
         return fuse_notify_poll_wakeup(fc, &outarg);
+
+err:
+        fuse_copy_finish(cs);
+        return err;
 }
 
 static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
@@ -846,6 +851,7 @@ static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
                 return fuse_notify_poll(fc, size, cs);
 
         default:
+                fuse_copy_finish(cs);
                 return -EINVAL;
         }
 }
@@ -924,7 +930,6 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
          */
         if (!oh.unique) {
                 err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), &cs);
-                fuse_copy_finish(&cs);
                 return err ? err : nbytes;
         }