To prepare for the following fix, move the code to hide and unhide the
P2SB device from p2sb_cache_resources() to p2sb_scan_and_cache().
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
---
drivers/platform/x86/p2sb.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)
diff --git a/drivers/platform/x86/p2sb.c b/drivers/platform/x86/p2sb.c
index 273ac90c8fbd..0bc6b21c4c20 100644
--- a/drivers/platform/x86/p2sb.c
+++ b/drivers/platform/x86/p2sb.c
@@ -97,6 +97,14 @@ static void p2sb_scan_and_cache_devfn(struct pci_bus *bus, unsigned int devfn)
static int p2sb_scan_and_cache(struct pci_bus *bus, unsigned int devfn)
{
+ /*
+ * The BIOS prevents the P2SB device from being enumerated by the PCI
+ * subsystem, so we need to unhide and hide it back to lookup the BAR.
+ * Unhide the P2SB device here, if needed.
+ */
+ if (p2sb_hidden_by_bios)
+ pci_bus_write_config_dword(bus, devfn, P2SBC, 0);
+
/* Scan the P2SB device and cache its BAR0 */
p2sb_scan_and_cache_devfn(bus, devfn);
@@ -104,6 +112,10 @@ static int p2sb_scan_and_cache(struct pci_bus *bus, unsigned int devfn)
if (devfn == P2SB_DEVFN_GOLDMONT)
p2sb_scan_and_cache_devfn(bus, SPI_DEVFN_GOLDMONT);
+ /* Hide the P2SB device, if it was hidden */
+ if (p2sb_hidden_by_bios)
+ pci_bus_write_config_dword(bus, devfn, P2SBC, P2SBC_HIDE);
+
if (!p2sb_valid_resource(&p2sb_resources[PCI_FUNC(devfn)].res))
return -ENOENT;
@@ -152,22 +164,11 @@ static int p2sb_cache_resources(void)
*/
pci_lock_rescan_remove();
- /*
- * The BIOS prevents the P2SB device from being enumerated by the PCI
- * subsystem, so we need to unhide and hide it back to lookup the BAR.
- * Unhide the P2SB device here, if needed.
- */
pci_bus_read_config_dword(bus, devfn_p2sb, P2SBC, &value);
p2sb_hidden_by_bios = value & P2SBC_HIDE;
- if (p2sb_hidden_by_bios)
- pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, 0);
ret = p2sb_scan_and_cache(bus, devfn_p2sb);
- /* Hide the P2SB device, if it was hidden */
- if (p2sb_hidden_by_bios)
- pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, P2SBC_HIDE);
-
pci_unlock_rescan_remove();
return ret;
--
2.47.0
