PCI: Fix return value from pci_user_{read,write}_config_*()

The PCI user-space config accessors pci_user_{read,write}_config_*() return
negative error numbers, which were introduced by commit 34e3207205ef
("PCI: handle positive error codes").  That patch converted all positive
error numbers from platform-specific PCI config accessors to -EINVAL, which
means the callers don't know anything about the specific cause of the
failure.

The patch fixes the issue by converting the positive PCIBIOS_* error values
to generic negative error numbers with pcibios_err_to_errno().

[bhelgaas: changelog]
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Greg Thelen <gthelen@google.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 018877b8b4e8..322335aaa7e1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -518,7 +518,7 @@ static inline int pcibios_err_to_errno(int err)
         case PCIBIOS_FUNC_NOT_SUPPORTED:
                 return -ENOENT;
         case PCIBIOS_BAD_VENDOR_ID:
-                return -EINVAL;
+                return -ENOTTY;
         case PCIBIOS_DEVICE_NOT_FOUND:
                 return -ENODEV;
         case PCIBIOS_BAD_REGISTER_NUMBER:
@@ -529,7 +529,7 @@ static inline int pcibios_err_to_errno(int err)
                 return -ENOSPC;
         }
 
-        return -ENOTTY;
+        return -ERANGE;
 }
 
 /* Low-level architecture-dependent routines */