On Thursday 21 October 2021 20:37:27 Naveen Naidu wrote: > Make PCI_OP_READ and PCI_USER_READ_CONFIG set the data value with error > response (~0), when the PCI device read by a host controller fails. > > This ensures that the controller drivers no longer need to fabricate > (~0) value when they detect error. It also gurantees that the error > response (~0) is always set when the controller drivers fails to read a > config register from a device. > > This makes error response fabrication consistent and helps in removal of > a lot of repeated code. > > Suggested-by: Rob Herring <robh@xxxxxxxxxx> > Reviewed-by: Rob Herring <robh@xxxxxxxxxx> > Signed-off-by: Naveen Naidu <naveennaidu479@xxxxxxxxx> Reviewed-by: Pali Rohár <pali@xxxxxxxxxx> > --- > drivers/pci/access.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/access.c b/drivers/pci/access.c > index 46935695cfb9..0f732ba2f71a 100644 > --- a/drivers/pci/access.c > +++ b/drivers/pci/access.c > @@ -42,7 +42,10 @@ int noinline pci_bus_read_config_##size \ > if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ > pci_lock_config(flags); \ > res = bus->ops->read(bus, devfn, pos, len, &data); \ > - *value = (type)data; \ > + if (res) \ > + SET_PCI_ERROR_RESPONSE(value); \ > + else \ > + *value = (type)data; \ > pci_unlock_config(flags); \ > return res; \ > } > @@ -228,7 +231,10 @@ int pci_user_read_config_##size \ > ret = dev->bus->ops->read(dev->bus, dev->devfn, \ > pos, sizeof(type), &data); \ > raw_spin_unlock_irq(&pci_lock); \ > - *val = (type)data; \ > + if (ret) \ > + SET_PCI_ERROR_RESPONSE(val); \ > + else \ > + *val = (type)data; \ > return pcibios_err_to_errno(ret); \ > } \ > EXPORT_SYMBOL_GPL(pci_user_read_config_##size); > -- > 2.25.1 >
