tree 6b02a53d2a7502365d7bbc541839ab8c008f3470
parent c1ddcf1cc9add03d775ba787b942729a4b87e7a6
author Kevin Mitchell <kevmitch@arista.com> 1560376323 -0700
committer Joerg Roedel <jroedel@suse.de> 1561982553 +0200

iommu/amd: Make iommu_disable safer

Make it safe to call iommu_disable during early init error conditions
before mmio_base is set, but after the struct amd_iommu has been added
to the amd_iommu_list. For example, this happens if firmware fails to
fill in mmio_phys in the ACPI table leading to a NULL pointer
dereference in iommu_feature_disable.

Fixes: 2c0ae1720c09c ('iommu/amd: Convert iommu initialization to state machine')
Signed-off-by: Kevin Mitchell <kevmitch@arista.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>