linux-kernel - [PATCH 0/3] msi: fix kobject/sysfs removal from msi

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Date:	Tue, 17 Sep 2013 03:47:41 +0200
From:	Veaceslav Falico <vfalico@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	Veaceslav Falico <vfalico@...hat.com>
Subject: [PATCH 0/3] msi: fix kobject/sysfs removal from msi_list

Currently, while removing msi_list's ->kobj, we just do kobject_put() on it
and after that free the entry itself. However, kobject_put() doesn't
guarantee that the kobject itself is freed - it can be used by someone else
and thus, when we'll free the entry, we'll free the kobject too - leading
to bugs in the other users (or when we'll finally release it).

Also, in some cases we might fail to register the kobjects, but we forget
to remove pdev->msi_kset, and this can lead to errors if we try to
re-register it - cause we already have that kset initialized.

Fix both issues by moving msi_kset/kobject deinitialization code completely
to free_msi_irqs(), which is called every time we fail and need to roll
back (and on the proper device irqs deinit). Also, move kfree-ing of the
msi_list entry to kobject->release (msi_kobj_release()), so that the entry
containing kobject will only be delisted in free_msi_irqs(), and free only
when there are no other users of its kobject.

CC: Bjorn Helgaas <bhelgaas@...gle.com>
CC: linux-pci@...r.kernel.org
CC: linux-kernel@...r.kernel.org
Signed-off-by: Veaceslav Falico <vfalico@...hat.com>

---
 drivers/pci/msi.c | 38 +++++++++++++++-----------------------
 1 file changed, 15 insertions(+), 23 deletions(-)
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