[LU-6693] object_update_param_get inconsistent return value

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: Di Wang
• Reporter: Oleg Drokin

Description

Recent patch http://review.whamcloud.com/14787 added a code to object_update_param_get that returns PTR_ERR. But before it only returned NUL on error which all callers expect.
Now every caller is broken as they don't expect non NULL errors.

E.g. in out_xattr_set, out_read (twice). in target/out_handler.c

I think we need to convert object_update_param_get back to returning just NULL on error.