diff options
| author | Naveen Naidu <naveennaidu479@gmail.com> | 2021-11-18 19:33:31 +0530 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-11-18 14:13:18 -0600 |
| commit | a18a025c2fb5fbf2d1d0606ea0d7441ac90e9c39 (patch) | |
| tree | fdd16a231812d57c94bdc6fc73bad8203c4b39bd /drivers/pci/hotplug | |
| parent | aa66ea10ba843d35582afaadc0b2f60af063b806 (diff) | |
PCI: cpqphp: Use PCI_POSSIBLE_ERROR() to check config reads
When config pci_ops.read() can detect failed PCI transactions, the data
returned to the CPU is PCI_ERROR_RESPONSE (~0 or 0xffffffff).
Obviously a successful PCI config read may *also* return that data if a
config register happens to contain ~0, so it doesn't definitively indicate
an error unless we know the register cannot contain ~0.
Use PCI_POSSIBLE_ERROR() to check the response we get when we read data
from hardware. This unifies PCI error response checking and makes error
checks consistent and easier to find.
Link: https://lore.kernel.org/r/b12005c0d57bb9d4c8b486724d078b7bd92f8321.1637243717.git.naveennaidu479@gmail.com
Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/hotplug')
| -rw-r--r-- | drivers/pci/hotplug/cpqphp_ctrl.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c index ed7b58eb64d2..93fd2a621822 100644 --- a/drivers/pci/hotplug/cpqphp_ctrl.c +++ b/drivers/pci/hotplug/cpqphp_ctrl.c @@ -2273,7 +2273,7 @@ static u32 configure_new_device(struct controller *ctrl, struct pci_func *func while ((function < max_functions) && (!stop_it)) { pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID); - if (ID == 0xFFFFFFFF) { + if (PCI_POSSIBLE_ERROR(ID)) { function++; } else { /* Setup slot structure. */ @@ -2517,7 +2517,7 @@ static int configure_new_function(struct controller *ctrl, struct pci_func *func pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0), 0x00, &ID); pci_bus->number = func->bus; - if (ID != 0xFFFFFFFF) { /* device present */ + if (!PCI_POSSIBLE_ERROR(ID)) { /* device present */ /* Setup slot structure. */ new_slot = cpqhp_slot_create(hold_bus_node->base); |