An MMIO read from a PCI device that doesn't exist or doesn't respond
causes a PCI error. There's no real data to return to satisfy the
CPU read, so most hardware fabricates ~0 data.
Use RESPONSE_IS_PCI_ERROR() to check the response we get when we read
data from hardware.
This helps unify PCI error response checking and make error checks
consistent and easier to find.
Reviewed-by: Jonathan Derrick <jonathan.derrick@xxxxxxxxx>
Signed-off-by: Naveen Naidu <naveennaidu479@xxxxxxxxx>
---
drivers/pci/controller/vmd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index a5987e52700e..db81bc4cfe8c 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -538,7 +538,7 @@ static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint,
int ret;
ret = pci_read_config_dword(dev, PCI_REG_VMLOCK, &vmlock);
- if (ret || vmlock == ~0)
+ if (ret || RESPONSE_IS_PCI_ERROR(&vmlock))
return -ENODEV;
if (MB2_SHADOW_EN(vmlock)) {
--
2.25.1
