Currently, pciehp_resume() try to hot add device if the slot adapter
status return true. But if there are already some devices exist,
namely list_empty(bus->devices) return false. We should not add the device
again, because the device add action will fail. Also print some uncomfortable
messages like this:
pciehp 0000:00:1c.1:pcie04: Device 0000:03:00.0 already exists at 0000:03:00, cannot hot-add
pciehp 0000:00:1c.1:pcie04: Cannot add device at 0000:03:00
Tested-by: Paul Bolle <pebolle@xxxxxxxxxx>
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
Cc: Paul Bolle <pebolle@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>
Cc: Oliver Neukum <oneukum@xxxxxxx>
Cc: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
---
drivers/pci/hotplug/pciehp_core.c | 10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 7d72c5e..7fe9dbd 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -300,6 +300,7 @@ static int pciehp_resume (struct pcie_device *dev)
{
struct controller *ctrl;
struct slot *slot;
+ struct pci_bus *pbus = dev->port->subordinate;
u8 status;
ctrl = get_service_data(dev);
@@ -311,10 +312,13 @@ static int pciehp_resume (struct pcie_device *dev)
/* Check if slot is occupied */
pciehp_get_adapter_status(slot, &status);
- if (status)
- pciehp_enable_slot(slot);
- else
+ if (status) {
+ if (list_empty(&pbus->devices))
+ pciehp_enable_slot(slot);
+ } else if (!list_empty(&pbus->devices)) {
pciehp_disable_slot(slot);
+ }
+
return 0;
}
#endif /* PM */
--
1.7.1
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