[PATCH 3/4] x86/pci/xen: Fix PCIBIOS_* return code handling

[Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>]

xen_pcifront_enable_irq() uses pci_read_config_byte() that returns
PCIBIOS_* codes. The error handling, however, assumes the codes are
normal errnos because it checks for < 0.

xen_pcifront_enable_irq() also returns the PCIBIOS_* code back to the
caller but the function is used as the (*pcibios_enable_irq) function
which should return normal errnos.

Convert the error check to plain non-zero check which works for
PCIBIOS_* return codes and convert the PCIBIOS_* return code using
pcibios_err_to_errno() into normal errno before returning it.

Fixes: 3f2a230caf21 ("xen: handled remapped IRQs when enabling a pcifront PCI 
device.")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
 arch/x86/pci/xen.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 652cd53e77f6..0f2fe524f60d 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -38,10 +38,10 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev)
        u8 gsi;
 
        rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
-       if (rc < 0) {
+       if (rc) {
                dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: 
%d\n",
                         rc);
-               return rc;
+               return pcibios_err_to_errno(rc);
        }
        /* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/
        pirq = gsi;
-- 
2.39.2