From 20349781a3ca833c67126888ddfce7c1517c772e Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 7 Jul 2020 13:12:10 -0600 Subject: [PATCH] pci: Avoid a crash in device_is_on_pci_bus() This function cannot currently be called on the root node. Add a check for this as well as a test. Signed-off-by: Simon Glass Reviewed-by: Wolfgang Wallner Reviewed-by: Bin Meng --- include/dm/device.h | 2 +- test/dm/pci.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/include/dm/device.h b/include/dm/device.h index f5738a0cee..953706cf52 100644 --- a/include/dm/device.h +++ b/include/dm/device.h @@ -764,7 +764,7 @@ int dev_enable_by_path(const char *path); */ static inline bool device_is_on_pci_bus(const struct udevice *dev) { - return device_get_uclass_id(dev->parent) == UCLASS_PCI; + return dev->parent && device_get_uclass_id(dev->parent) == UCLASS_PCI; } /** diff --git a/test/dm/pci.c b/test/dm/pci.c index fb93e4c78a..39e82b3699 100644 --- a/test/dm/pci.c +++ b/test/dm/pci.c @@ -339,3 +339,17 @@ static int dm_test_pci_addr_live(struct unit_test_state *uts) } DM_TEST(dm_test_pci_addr_live, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT | DM_TESTF_LIVE_TREE); + +/* Test device_is_on_pci_bus() */ +static int dm_test_pci_on_bus(struct unit_test_state *uts) +{ + struct udevice *dev; + + ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(0, 0x1f, 0), &dev)); + ut_asserteq(true, device_is_on_pci_bus(dev)); + ut_asserteq(false, device_is_on_pci_bus(dev_get_parent(dev))); + ut_asserteq(true, device_is_on_pci_bus(dev)); + + return 0; +} +DM_TEST(dm_test_pci_on_bus, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT); -- 2.39.5