From e705c2959b06b9db184842852da619a0b1672bbc Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 19 May 2015 15:27:58 +0200 Subject: PCI: pciehp: Drop pointless ACPI-based "slot detection" check Jarod Wilson reports that ExpressCard hotplug doesn't work on HP ZBook G2. The problem turns out to be the ACPI-based "slot detection" code called from pciehp_probe() which uses questionable heuristics based on what ACPI objects are present for the PCIe port device to figure out whether to register a hotplug slot for that port. That code is used if there is at least one PCIe port having an ACPI device configuration object related to hotplug (such as _EJ0 or _RMV), and the Thunderbolt port on the ZBook has _RMV. Of course, Thunderbolt and PCIe native hotplug need not be mutually exclusive (as they aren't on the ZBook), so that rule is simply incorrect. Moreover, the ACPI-based "slot detection" check does not add any value if pciehp_probe() is called at all and the service type of the device object it has been called for is PCIE_PORT_SERVICE_HP, because PCIe hotplug services are only registered if the _OSC handshake in acpi_pci_root_add() allows the kernel to control the PCIe native hotplug feature. No more checks need to be carried out to decide whether or not to register a native PCIe hotlug slot in that case. For the above reasons, make pciehp_probe() check if it has been called for the right service type and drop the pointless ACPI-based "slot detection" check from it. Also remove the entire code whose only user is that check (the entire pciehp_acpi.c file goes away as a result) and drop function headers related to it from the internal pciehp header file. Link: http://lkml.kernel.org/r/1431632038-39917-1-git-send-email-jarod@redhat.com Link: https://bugzilla.kernel.org/show_bug.cgi?id=98581 Reported-by: Jarod Wilson Signed-off-by: Rafael J. Wysocki Signed-off-by: Bjorn Helgaas Reviewed-by: Jarod Wilson Tested-by: Jarod Wilson --- drivers/pci/hotplug/pciehp.h | 17 ----------------- 1 file changed, 17 deletions(-) (limited to 'drivers/pci/hotplug/pciehp.h') diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index b11521953485..ce4d12c4eff4 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -167,21 +167,4 @@ static inline const char *slot_name(struct slot *slot) return hotplug_slot_name(slot->hotplug_slot); } -#ifdef CONFIG_ACPI -#include - -void __init pciehp_acpi_slot_detection_init(void); -int pciehp_acpi_slot_detection_check(struct pci_dev *dev); - -static inline void pciehp_firmware_init(void) -{ - pciehp_acpi_slot_detection_init(); -} -#else -#define pciehp_firmware_init() do {} while (0) -static inline int pciehp_acpi_slot_detection_check(struct pci_dev *dev) -{ - return 0; -} -#endif /* CONFIG_ACPI */ #endif /* _PCIEHP_H */ -- cgit v1.2.3