From: Xiongfeng Wang wangxiongfeng2@huawei.com
[ Upstream commit afca9e19cc720bfafc75dc5ce429c185ca93f31d ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel/iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index e47700674978..412b106d2a39 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -3844,8 +3844,10 @@ 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; }