[PATCH AUTOSEL for 4.14 079/161] RDMA/uverbs: Use an unambiguous errno for method not supported

From: Jason Gunthorpe [ Upstream commit 3624a8f02568f08aef299d3b117f2226f621177d ] Returning EOPNOTSUPP is problematic because it can also be returned by the method function, and we use it in quite a few places in drivers these days. Instead, dedicate EPROTONOSUPPORT to

[PATCH AUTOSEL for 4.14 079/161] RDMA/uverbs: Use an unambiguous errno for method not supported

From: Jason Gunthorpe [ Upstream commit 3624a8f02568f08aef299d3b117f2226f621177d ] Returning EOPNOTSUPP is problematic because it can also be returned by the method function, and we use it in quite a few places in drivers these days. Instead, dedicate EPROTONOSUPPORT to indicate that the ioctl