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Commit 45e528d9 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Check for busy devices earlier in attach_device() 



Check early in attach_device whether the device is already attached to a
domain. This also simplifies the code path so that __attach_device() can
be removed.

Fixes: 92d420ec ("iommu/amd: Relax locking in dma_ops path")
Reviewed-by: default avatarFilippo Sironi <sironi@amazon.de>
Reviewed-by: default avatarJerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent f6c0bfce

drivers/iommu/amd_iommu.c

+7 −18
Original line number Diff line number Diff line
@@ -2072,23 +2072,6 @@ static void do_detach(struct iommu_dev_data *dev_data) 
	domain->dev_cnt                 -= 1;

}



/*

 * If a device is not yet associated with a domain, this function makes the

 * device visible in the domain

 */

static int __attach_device(struct iommu_dev_data *dev_data,

			   struct protection_domain *domain)

{

	if (dev_data->domain != NULL)

		return -EBUSY;



	/* Attach alias group root */

	do_attach(dev_data, domain);



	return 0;

}





static void pdev_iommuv2_disable(struct pci_dev *pdev)

{

	pci_disable_ats(pdev);
@@ -2174,6 +2157,10 @@ static int attach_device(struct device *dev, 


	dev_data = get_dev_data(dev);



	ret = -EBUSY;

	if (dev_data->domain != NULL)

		goto out;



	if (!dev_is_pci(dev))

		goto skip_ats_check;
@@ -2198,7 +2185,9 @@ static int attach_device(struct device *dev, 
	}



skip_ats_check:

	ret = __attach_device(dev_data, domain);

	ret = 0;



	do_attach(dev_data, domain);



	/*

	 * We might boot into a crash-kernel here. The crashed kernel