livepatch: Cancel transition a safe way for immediate patches
authorPetr Mladek <pmladek@suse.com>
Tue, 11 Apr 2017 11:07:48 +0000 (13:07 +0200)
committerJiri Kosina <jkosina@suse.cz>
Tue, 11 Apr 2017 18:54:27 +0000 (20:54 +0200)
commite679af627fe875a51d40b9a2b17f08fbde36e0e2
treefb42666cf8009e2569607e12636ade178fae0a48
parent10517429b5ac242498d7d847f79f10c21d7eedb0
livepatch: Cancel transition a safe way for immediate patches

klp_init_transition() does not set func->transition for immediate patches.
Then klp_ftrace_handler() could use the new code immediately. As a result,
it is not safe to put the livepatch module in klp_cancel_transition().

This patch reverts most of the last minute changes klp_cancel_transition().
It keeps the warning about a misuse because it still makes sense.

Fixes: 3ec24776bfd0 ("livepatch: allow removal of a disabled patch")
Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
kernel/livepatch/transition.c