[PATCH v2 2/3] msi: always unregister ->msi_kset within free_msi_irqs()

[Veaceslav Falico <vfalico@redhat.com>]

Currently we create and populate ->msi_kset while allocating irqs in
populate_msi_sysfs(), however if it fails and/or we want to free the
entries - we don't always remove it, and we might have problems if we've
failed to allocate irqs and try it again.

To fix that, move the unregister part to free_msi_irqs() and remove already
existing ones. Also, verify if it was actually created - we don't always
call free_msi_irqs() after populate_msi_sysfs().

CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Neil Horman <nhorman@tuxdriver.com>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: linux-pci@vger.kernel.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
---

Notes:
    v1  -> v2:
    Verify if the kset was actually register before unregistering.

 drivers/pci/msi.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 0771508..dafda2b 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -391,6 +391,11 @@ static void free_msi_irqs(struct pci_dev *dev)
 			kfree(entry);
 		}
 	}
+
+	if (dev->msi_kset) {
+		kset_unregister(dev->msi_kset);
+		dev->msi_kset = NULL;
+	}
 }
 
 static struct msi_desc *alloc_msi_entry(struct pci_dev *dev)
@@ -904,8 +909,6 @@ void pci_disable_msi(struct pci_dev *dev)
 
 	pci_msi_shutdown(dev);
 	free_msi_irqs(dev);
-	kset_unregister(dev->msi_kset);
-	dev->msi_kset = NULL;
 }
 EXPORT_SYMBOL(pci_disable_msi);
 
@@ -1002,8 +1005,6 @@ void pci_disable_msix(struct pci_dev *dev)
 
 	pci_msix_shutdown(dev);
 	free_msi_irqs(dev);
-	kset_unregister(dev->msi_kset);
-	dev->msi_kset = NULL;
 }
 EXPORT_SYMBOL(pci_disable_msix);
 
-- 
1.8.4