From: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
When executed for a PCI_ROOT_COMPLEX type, iort_match_node_callback()
expects the opaque pointer argument to be a PCI bus device. At the
moment rc_dma_get_range() passes the PCI endpoint instead of the bus,
and we've been lucky to have pci_domain_nr(ptr) return 0 instead of
crashing. Pass the bus device to iort_scan_node().
Fixes: 5ac65e8c8941 ("ACPI/IORT: Support address size limit for root complexes")
Reported-by: Eric Auger <eric.auger@xxxxxxxxxx>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Acked-by: Robin Murphy <robin.murphy@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Cc: Sudeep Holla <sudeep.holla@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
---
Will, Catalin,
resending a reformatted version of this fix previously posted in [1],
please merge it for one of the upcoming -rc.
Thanks,
Lorenzo
[1] https://marc.info/?l=linux-acpi&m=154712742324811&w=2
drivers/acpi/arm64/iort.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index fdd90ffceb85..c08afe44c488 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -952,9 +952,10 @@ static int rc_dma_get_range(struct device *dev, u64 *size)
{
struct acpi_iort_node *node;
struct acpi_iort_root_complex *rc;
+ struct pci_bus *pbus = to_pci_dev(dev)->bus;
node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
- iort_match_node_callback, dev);
+ iort_match_node_callback, &pbus->dev);
if (!node || node->revision < 1)
return -ENODEV;
--
2.19.2
