Commit afca9e19cc72 for kernel

commit afca9e19cc720bfafc75dc5ce429c185ca93f31d
Author: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Date:   Thu Dec 1 12:01:26 2022 +0800

    iommu/vt-d: Fix PCI device refcount leak in has_external_pci()

    for_each_pci_dev() is implemented by pci_get_device(). The comment of
    pci_get_device() says that it will increase the reference count for the
    returned pci_dev and also decrease the reference count for the input
    pci_dev @from if it is not NULL.

    If we break for_each_pci_dev() loop with pdev not NULL, we need to call
    pci_dev_put() to decrease the reference count. Add the missing
    pci_dev_put() before 'return true' to avoid reference count leak.

    Fixes: 89a6079df791 ("iommu/vt-d: Force IOMMU on for platform opt in hint")
    Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
    Link: https://lore.kernel.org/r/20221121113649.190393-2-wangxiongfeng2@huawei.com
    Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 587eebe39820..5287efe247b1 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3873,8 +3873,10 @@ static inline bool has_external_pci(void)
 	struct pci_dev *pdev = NULL;

 	for_each_pci_dev(pdev)
-		if (pdev->external_facing)
+		if (pdev->external_facing) {
+			pci_dev_put(pdev);
 			return true;
+		}

 	return false;
 }