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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 <jarod@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jarod Wilson <jarod@redhat.com> Tested-by: Jarod Wilson <jarod@redhat.com> |
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| .. | ||
| acpi_pcihp.c | ||
| acpiphp_core.c | ||
| acpiphp_glue.c | ||
| acpiphp_ibm.c | ||
| acpiphp.h | ||
| cpci_hotplug_core.c | ||
| cpci_hotplug_pci.c | ||
| cpci_hotplug.h | ||
| cpcihp_generic.c | ||
| cpcihp_zt5550.c | ||
| cpcihp_zt5550.h | ||
| cpqphp_core.c | ||
| cpqphp_ctrl.c | ||
| cpqphp_nvram.c | ||
| cpqphp_nvram.h | ||
| cpqphp_pci.c | ||
| cpqphp_sysfs.c | ||
| cpqphp.h | ||
| ibmphp_core.c | ||
| ibmphp_ebda.c | ||
| ibmphp_hpc.c | ||
| ibmphp_pci.c | ||
| ibmphp_res.c | ||
| ibmphp.h | ||
| Kconfig | ||
| Makefile | ||
| pci_hotplug_core.c | ||
| pciehp_core.c | ||
| pciehp_ctrl.c | ||
| pciehp_hpc.c | ||
| pciehp_pci.c | ||
| pciehp.h | ||
| pcihp_skeleton.c | ||
| rpadlpar_core.c | ||
| rpadlpar_sysfs.c | ||
| rpadlpar.h | ||
| rpaphp_core.c | ||
| rpaphp_pci.c | ||
| rpaphp_slot.c | ||
| rpaphp.h | ||
| s390_pci_hpc.c | ||
| sgi_hotplug.c | ||
| shpchp_core.c | ||
| shpchp_ctrl.c | ||
| shpchp_hpc.c | ||
| shpchp_pci.c | ||
| shpchp_sysfs.c | ||
| shpchp.h | ||