Merge tag 'pci-v5.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fix from Bjorn Helgaas:
"If an IOMMU is present, ignore the P2PDMA whitelist we added for v5.2
because we don't yet know how to support P2PDMA in that case (Logan
Gunthorpe)"
* tag 'pci-v5.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI/P2PDMA: Ignore root complex whitelist when an IOMMU is present
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index a98126a..a4994aa 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -18,6 +18,7 @@
#include <linux/percpu-refcount.h>
#include <linux/random.h>
#include <linux/seq_buf.h>
+#include <linux/iommu.h>
struct pci_p2pdma {
struct gen_pool *pool;
@@ -299,6 +300,9 @@ static bool root_complex_whitelist(struct pci_dev *dev)
struct pci_dev *root = pci_get_slot(host->bus, PCI_DEVFN(0, 0));
unsigned short vendor, device;
+ if (iommu_present(dev->dev.bus))
+ return false;
+
if (!root)
return false;
