From: Niklas Cassel <cassel@xxxxxxxxxx> [ Upstream commit 7e80bbef1d697dbce7a39cfad0df770880fe3f29 ] The current code returns -ENOMEM if test->bar[barno] is NULL. There can be two reasons why test->bar[barno] is NULL: 1) The pci_ioremap_bar() call in pci_endpoint_test_probe() failed. 2) The BAR was skipped, because it is disabled by the endpoint. Many PCI endpoint controller drivers will disable all BARs in their init function. A disabled BAR will have a size of 0. A PCI endpoint function driver will be able to enable any BAR that is not marked as BAR_RESERVED (which means that the BAR should not be touched by the EPF driver). Thus, perform check if the size is 0, before checking if test->bar[barno] is NULL, such that we can return different errors. This will allow the selftests to return SKIP instead of FAIL for disabled BARs. Signed-off-by: Niklas Cassel <cassel@xxxxxxxxxx> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> Link: https://lore.kernel.org/r/20250123120147.3603409-3-cassel@xxxxxxxxxx Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> [kwilczynski: commit log] Signed-off-by: Krzysztof Wilczyński <kwilczynski@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/misc/pci_endpoint_test.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c index e22afb420d099..f05256b7c2084 100644 --- a/drivers/misc/pci_endpoint_test.c +++ b/drivers/misc/pci_endpoint_test.c @@ -287,11 +287,13 @@ static bool pci_endpoint_test_bar(struct pci_endpoint_test *test, void *read_buf __free(kfree) = NULL; struct pci_dev *pdev = test->pdev; + bar_size = pci_resource_len(pdev, barno); + if (!bar_size) + return -ENODATA; + if (!test->bar[barno]) return false; - bar_size = pci_resource_len(pdev, barno); - if (barno == test->test_reg_bar) bar_size = 0x4; -- 2.39.5
