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, 4 insertions, 8 deletions

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 7f8b78c08879..8c148f39e8d7 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -148,7 +148,7 @@ static noinline void pci_wait_cfg(struct pci_dev *dev)
 int pci_user_read_config_##size                                         \
         (struct pci_dev *dev, int pos, type *val)                       \
 {                                                                       \
-        int ret = 0;                                                    \
+        int ret = PCIBIOS_SUCCESSFUL;                                   \
         u32 data = -1;                                                  \
         if (PCI_##size##_BAD)                                           \
                 return -EINVAL;                                         \
@@ -159,9 +159,7 @@ int pci_user_read_config_##size						\
                                         pos, sizeof(type), &data);      \
         raw_spin_unlock_irq(&pci_lock);                         \
         *val = (type)data;                                              \
-        if (ret > 0)                                                    \
-                ret = -EINVAL;                                          \
-        return ret;                                                     \
+        return pcibios_err_to_errno(ret);                               \
 }                                                                       \
 EXPORT_SYMBOL_GPL(pci_user_read_config_##size);
 
@@ -170,7 +168,7 @@ EXPORT_SYMBOL_GPL(pci_user_read_config_##size);
 int pci_user_write_config_##size                                        \
         (struct pci_dev *dev, int pos, type val)                        \
 {                                                                       \
-        int ret = -EIO;                                                 \
+        int ret = PCIBIOS_SUCCESSFUL;                                   \
         if (PCI_##size##_BAD)                                           \
                 return -EINVAL;                                         \
         raw_spin_lock_irq(&pci_lock);                           \
@@ -179,9 +177,7 @@ int pci_user_write_config_##size					\
         ret = dev->bus->ops->write(dev->bus, dev->devfn,                \
                                         pos, sizeof(type), val);        \
         raw_spin_unlock_irq(&pci_lock);                         \
-        if (ret > 0)                                                    \
-                ret = -EINVAL;                                          \
-        return ret;                                                     \
+        return pcibios_err_to_errno(ret);                               \
 }                                                                       \
 EXPORT_SYMBOL_GPL(pci_user_write_config_##size);