From: Niklas Cassel cassel@kernel.org
[ 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@kernel.org Reviewed-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Link: https://lore.kernel.org/r/20250123120147.3603409-3-cassel@kernel.org Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org [kwilczynski: commit log] Signed-off-by: Krzysztof Wilczyński kwilczynski@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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;