As done elsewhere, the ns16550 code shouldn''t look at non-zero
functions of a device if that isn''t multi-function.
Also both there and in pass-through''s _scan_pci_devices() skip looking
at non-zero functions when the device at function zero doesn''t exist.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -469,21 +469,28 @@ static int
pci_uart_config (struct ns16550 *uart, int skip_amt, int bar_idx)
{
uint32_t bar, len;
- int b, d, f;
+ int b, d, f, nextf;
/* NB. Start at bus 1 to avoid AMT: a plug-in card cannot be on bus 0. */
for ( b = skip_amt ? 1 : 0; b < 0x100; b++ )
{
for ( d = 0; d < 0x20; d++ )
{
- for ( f = 0; f < 0x8; f++ )
+ for ( f = 0; f < 8; f = nextf )
{
+ nextf = (f || (pci_conf_read16(0, b, d, f, PCI_HEADER_TYPE)
&
+ 0x80)) ? f + 1 : 8;
+
switch ( pci_conf_read16(0, b, d, f, PCI_CLASS_DEVICE) )
{
case 0x0700: /* single port serial */
case 0x0702: /* multi port serial */
case 0x0780: /* other (e.g serial+parallel) */
break;
+ case 0xffff:
+ if ( !f )
+ nextf = 8;
+ /* fall through */
default:
continue;
}
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -628,7 +628,11 @@ static int __init _scan_pci_devices(stru
for ( func = 0; func < 8; func++ )
{
if ( pci_device_detect(pseg->nr, bus, dev, func) == 0 )
+ {
+ if ( !func )
+ break;
continue;
+ }
pdev = alloc_pdev(pseg, bus, PCI_DEVFN(dev, func));
if ( !pdev )
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