This is a note to let you know that I've just added the patch titled
iommu/amd: Fix error handling for pdev_pri_ats_enable()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-amd-fix-error-handling-for-pdev_pri_ats_enable.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 18d5aeff967392614ff4926ebff6c5a769ce25a2
Author: Vasant Hegde <vasant.hegde@xxxxxxx>
Date: Wed Jan 11 12:15:03 2023 +0000
iommu/amd: Fix error handling for pdev_pri_ats_enable()
[ Upstream commit 080920e52148b4fbbf9360d5345fdcd7846e4841 ]
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@xxxxxxxxxxxxx/
Reported-by: Matt Fagnani <matt.fagnani@xxxxxxxx>
Signed-off-by: Vasant Hegde <vasant.hegde@xxxxxxx>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Link: https://lore.kernel.org/r/20230111121503.5931-1-vasant.hegde@xxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 968e5e6668b26..20adb9b323d82 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1712,27 +1712,29 @@ 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;
