From: Petr Mladek <pmladek@suse.com>
To: "Tobin C. Harding" <tobin@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Joe Lawrence <joe.lawrence@redhat.com>,
live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] livepatch: Use correct kobject cleanup function
Date: Tue, 30 Apr 2019 17:08:11 +0200 [thread overview]
Message-ID: <20190430150811.4hzhtz4w46o6numh@pathway.suse.cz> (raw)
In-Reply-To: <20190430001534.26246-3-tobin@kernel.org>
On Tue 2019-04-30 10:15:34, Tobin C. Harding wrote:
> The correct cleanup function after a call to kobject_init_and_add() has
> succeeded is kobject_del() _not_ kobject_put(). kobject_del() calls
> kobject_put().
Really? I see only kobject_put(kobj->parent) in kobject_del.
It decreases a reference of the _parent_ object and not
the given one.
Also the section "Kobject removal" in Documentation/kobject.txt
says that kobject_del() is for two-stage removal. kobject_put()
still needs to get called at a later time.
IMHO, this patch causes that kobject_put() would never get called.
That said, we could probably make the removal a bit cleaner
by using kobject_del() in klp_free_patch_start() and
kobject_put() in klp_free_patch_finish(). But I have
to think more about it.
Best Regards,
Petr
next prev parent reply other threads:[~2019-04-30 15:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 0:15 [PATCH 0/2] livepatch: Fix usage of kobject_init_and_add() Tobin C. Harding
2019-04-30 0:15 ` [PATCH 1/2] livepatch: Fix kobject memleak Tobin C. Harding
2019-04-30 8:42 ` Greg Kroah-Hartman
2019-04-30 10:44 ` Miroslav Benes
2019-04-30 10:46 ` Greg Kroah-Hartman
2019-04-30 22:39 ` Tobin C. Harding
2019-04-30 14:56 ` Petr Mladek
2019-04-30 15:10 ` Greg Kroah-Hartman
2019-04-30 0:15 ` [PATCH 2/2] livepatch: Use correct kobject cleanup function Tobin C. Harding
2019-04-30 8:43 ` Greg Kroah-Hartman
2019-04-30 11:00 ` Miroslav Benes
2019-04-30 21:38 ` Tobin C. Harding
2019-04-30 15:08 ` Petr Mladek [this message]
2019-04-30 21:37 ` Tobin C. Harding
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