| Message ID | 5be1fdfdcf4b4a453117ef4dea0f71c9555fac24.1634825082.git.naveennaidu479@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | Unify PCI error response checking | expand |
On 21/10, 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..bfe6b002ffec 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 > Jonathan, I haven't added your Reviewed-by tag to this patch which you gave in v1 of the series [1] , because the macro definition of the RESPONSE_IS_PCI_ERROR changed slightly, and I was not sure if you would be okay with it. I hope it was right thing to do, if not I apologize for that. [1]: https://lore.kernel.org/linux-pci/f3aca934-7dee-b294-ad3c-264e773eddda@linux.dev/T/#u Thanks, Naveen
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index a5987e52700e..bfe6b002ffec 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(-)