| Message ID | 84ab7a23647e0673d99a8cf59e9c89af9b862354.1633972263.git.naveennaidu479@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | PCI: Unify PCI error response checking | expand |
On 10/11/2021 12:06 PM, Naveen Naidu wrote: > 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. > > Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> > --- > 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)) { > Reviewed-by: Jonathan Derrick <jonathan.derrick@linux.dev>
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)) {
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. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/controller/vmd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)