[PATCH 0/2] target: OOPS in target_fabric_port_link on v3.7.4 andv3.4.27

[Ben Peddell]

There is an OOPS in target_fabric_port_link due to a use before
initialization error.

commit 0ff8754981261a80f4b77db2536dfea92c2d4539 (target: Add link_magic
for fabric allow_link destination target_items) as merged in the
linux-3.7.y and linux-3.4.y branches relies on one of the changes that
occurred in commit 0fd97ccf45be26fb01b3a412f1f6c6b5044b2f16 (Simplify
the code a lot by killing the superflous struct se_subsystem_dev).
Without that change, dev is dereferenced before it is initialized.

Commit 0fd97ccf45be26fb01b3a412f1f6c6b5044b2f16 looks too invasive,
which I would guess would be why it wasn't merged in.

One option would be to move the dev->dev_link_magic test to after dev is
initialized, as presented the patches I will be following up with.

An alternative that will resolve this OOPS is to revert commit
fdf9d862969f1be18814273b03fb9497ec2dbdae (target: Add link_magic for
fabric allow_link destination target_items) on branch linux-3.7.y, and
revert commit 92a7389317838f3338466df0c0e3d23ad33cb1f4 (target: Add
link_magic for fabric allow_link destination target_items) on branch
linux-3.4.y
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