RDMA/uverbs: Use an unambiguous errno for method not supported

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[ Upstream commit 3624a8f025 ]

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 framework
is enabled but the requested object and method are not supported by
the kernel. No other case will return this code, and it lets userspace
know to fall back to write().

grep says we do not use it today in drivers/infiniband subsystem.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jason Gunthorpe 2018-01-24 19:58:34 -07:00 • committed by Greg Kroah-Hartman

parent 827aab45cb

commit 19b3638ce4

1 changed files with 13 additions and 6 deletions

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drivers/infiniband/core/uverbs_ioctl.c

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