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>diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 7f8b78c..8c148f3 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -148,7 +148,7 @@
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 @@
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 @@
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 @@
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);