linux-kernel - [PATCH v2 2/2] pci/iov: fix kobject_uevent() ordering in sriov

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Date: Fri, 9 Feb 2024 23:52:17 +0000
From: Jim Harris <jim.harris@...sung.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Leon Romanovsky <leonro@...dia.com>, "Jason
 Gunthorpe" <jgg@...dia.com>, Alex Williamson <alex.williamson@...hat.com>,
	"pierre.cregut@...nge.com" <pierre.cregut@...nge.com>
Subject: [PATCH v2 2/2] pci/iov: fix kobject_uevent() ordering in
 sriov_enable()

Wait to call kobject_uevent() until all of the associated changes are done,
including updating the num_VFs value. This avoids any possibility of
userspace responding to the event and getting a stale value (although
probably impossible to actually happen).

Suggested-by: Leon Romanovsky <leonro@...dia.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Jim Harris <jim.harris@...sung.com>
---
 drivers/pci/iov.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 0ca20cd518d5..c00b0f822526 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -677,8 +677,8 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 	if (rc)
 		goto err_pcibios;
 
-	kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
 	iov->num_VFs = nr_virtfn;
+	kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
 
 	return 0;