[PATCH] iommu/amd: Fix error handling for pdev_pri_ats_enable()

[PATCH] iommu/amd: Fix error handling for pdev_pri_ats_enable()

[Vasant Hegde]

Current code throws kernel warning if it fails to enable pasid/pri [1].
Do not call pci_disable_[pasid/pri] if pci_enable_[pasid/pri] failed.

[1] https://lore.kernel.org/linux-iommu/15d0f9ff-2a56-b3e9-5b45-e6b23300ae3b@leemhuis.info/

Reported-by: Matt Fagnani <matt.fagnani@bell.net>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 drivers/iommu/amd/iommu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index cbeaab55c0db..2f8c018e1ffd 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1702,27 +1702,29 @@ static int pdev_pri_ats_enable(struct pci_dev *pdev)
 	/* Only allow access to user-accessible pages */
 	ret = pci_enable_pasid(pdev, 0);
 	if (ret)
-		goto out_err;
+		return ret;
 
 	/* First reset the PRI state of the device */
 	ret = pci_reset_pri(pdev);
 	if (ret)
-		goto out_err;
+		goto out_err_pasid;
 
 	/* Enable PRI */
 	/* FIXME: Hardcode number of outstanding requests for now */
 	ret = pci_enable_pri(pdev, 32);
 	if (ret)
-		goto out_err;
+		goto out_err_pasid;
 
 	ret = pci_enable_ats(pdev, PAGE_SHIFT);
 	if (ret)
-		goto out_err;
+		goto out_err_pri;
 
 	return 0;
 
-out_err:
+out_err_pri:
 	pci_disable_pri(pdev);
+
+out_err_pasid:
 	pci_disable_pasid(pdev);
 
 	return ret;
-- 
2.31.1

Re: [PATCH] iommu/amd: Fix error handling for pdev_pri_ats_enable()

[Joerg Roedel]

On Wed, Jan 11, 2023 at 12:15:03PM +0000, Vasant Hegde wrote:
>  drivers/iommu/amd/iommu.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)

Applied, thanks.