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Merge tag 'pci-v5.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

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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
This commit is contained in:
Linus Torvalds
2019-06-22 09:42:29 -07:00
parent f410276646 6dbbd053e6
commit b253d5f3ec
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/p2pdma.c
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@@ -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;