From: Guenter Roeck linux@roeck-us.net
[ Upstream commit 66c3f05ddc538ee796321210c906b6ae6fc0792a ]
pci_resource_start() is not a good indicator to determine if a PCI resource exists or not, since the resource may start at address 0. This is seen when trying to instantiate the driver in qemu for riscv32 or riscv64.
pci 0000:00:01.0: reg 0x10: [io 0x0000-0x001f] pci 0000:00:01.0: reg 0x14: [mem 0x00000000-0x0000001f] ... pcnet32: card has no PCI IO resources, aborting
Use pci_resouce_len() instead.
Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/amd/pcnet32.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/amd/pcnet32.c +++ b/drivers/net/ethernet/amd/pcnet32.c @@ -1548,8 +1548,7 @@ pcnet32_probe_pci(struct pci_dev *pdev, } pci_set_master(pdev);
- ioaddr = pci_resource_start(pdev, 0); - if (!ioaddr) { + if (!pci_resource_len(pdev, 0)) { if (pcnet32_debug & NETIF_MSG_PROBE) pr_err("card has no PCI IO resources, aborting\n"); return -ENODEV; @@ -1561,6 +1560,8 @@ pcnet32_probe_pci(struct pci_dev *pdev, pr_err("architecture does not support 32bit PCI busmaster DMA\n"); return err; } + + ioaddr = pci_resource_start(pdev, 0); if (!request_region(ioaddr, PCNET32_TOTAL_SIZE, "pcnet32_probe_pci")) { if (pcnet32_debug & NETIF_MSG_PROBE) pr_err("io address range already allocated\n");