yaffs: Fix yaffs_file_write to not return -ENOSPC when there is nothing to write

yaffs_write_end may get called with copied == 0 if the requested write was
interrupted by a signal, but user-space will not restart the write if -ENOSPC
is returned.

Signed-off-by: Arve Hjønnevåg <arve@android.com>

diff --git a/fs/yaffs2/yaffs_fs.c b/fs/yaffs2/yaffs_fs.c
index 30ae7c7..2288eee 100644 (file)
--- a/fs/yaffs2/yaffs_fs.c
+++ b/fs/yaffs2/yaffs_fs.c
@@ -1075,7 +1075,7 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 
        }
        yaffs_GrossUnlock(dev);
-       return nWritten == 0 ? -ENOSPC : nWritten;
+       return (!nWritten && n) ? -ENOSPC : nWritten;
 }
 
 /* Space holding and freeing is done to ensure we have space available for write_begin/end */