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Date: Sun, 23 Jun 2013 23:54:15 +0800
From: Jiang Liu <liuj97@...il.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
CC: linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
Yinghai Lu <yinghai@...nel.org>,
"Alexander E . Patrakov" <patrakov@...il.com>,
Jiang Liu <jiang.liu@...wei.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ACPI / dock / PCI: Synchronous handling of dock events
for PCI devices
On 06/23/2013 05:25 AM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The interactions between the ACPI dock driver and the ACPI-based PCI
> hotplug (acpiphp) are currently problematic because of ordering
> issues during hot-remove operations.
>
> First of all, the current ACPI glue code expects that physical
> devices will always be deleted before deleting the companion ACPI
> device objects. Otherwise, acpi_unbind_one() will fail with a
> warning message printed to the kernel log, for example:
>
> [ 185.026073] usb usb5: Oops, 'acpi_handle' corrupt
> [ 185.035150] pci 0000:1b:00.0: Oops, 'acpi_handle' corrupt
> [ 185.035515] pci 0000:18:02.0: Oops, 'acpi_handle' corrupt
> [ 180.013656] port1: Oops, 'acpi_handle' corrupt
>
[...]
> @@ -597,15 +654,11 @@ register_hotplug_dock_device(acpi_handle
> * ops
> */
> dd = find_dock_dependent_device(dock_station, handle);
> - if (dd) {
> - dd->ops = ops;
> - dd->context = context;
> - dock_add_hotplug_device(dock_station, dd);
> - ret = 0;
> - }
> + if (dd)
> + return dock_init_hotplug(dd, ops, context,
> + init, release);
Hi Rafael,
Seems not an equivalent change. According to the comment just above the
code, we shouldn't return but continue here.
/*
* An ATA bay can be in a dock and itself can be ejected
* separately, so there are two 'dock stations' which need the
* ops
*/
Regards!
Gerry
>
> -
> - return ret;
> + return -EINVAL;
> }
> EXPORT_SYMBOL_GPL(register_hotplug_dock_device);
>
> @@ -623,8 +676,10 @@ void unregister_hotplug_dock_device(acpi
>
> list_for_each_entry(dock_station, &dock_stations, sibling) {
> dd = find_dock_dependent_device(dock_station, handle);
> - if (dd)
> - dock_del_hotplug_device(dock_station, dd);
> + if (dd) {
> + dock_release_hotplug(dd);
> + return;
> + }
> }
> }
> EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
> @@ -953,7 +1008,6 @@ static int __init dock_add(acpi_handle h
> mutex_init(&dock_station->hp_lock);
> spin_lock_init(&dock_station->dd_lock);
> INIT_LIST_HEAD(&dock_station->sibling);
> - INIT_LIST_HEAD(&dock_station->hotplug_devices);
> ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
> INIT_LIST_HEAD(&dock_station->dependent_devices);
>
> Index: linux-pm/include/acpi/acpi_drivers.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_drivers.h
> +++ linux-pm/include/acpi/acpi_drivers.h
> @@ -123,7 +123,9 @@ extern int register_dock_notifier(struct
> extern void unregister_dock_notifier(struct notifier_block *nb);
> extern int register_hotplug_dock_device(acpi_handle handle,
> const struct acpi_dock_ops *ops,
> - void *context);
> + void *context,
> + void (*init)(void *),
> + void (*release)(void *));
> extern void unregister_hotplug_dock_device(acpi_handle handle);
> #else
> static inline int is_dock_device(acpi_handle handle)
> Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
> +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> @@ -61,6 +61,7 @@ static DEFINE_MUTEX(bridge_mutex);
> static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
> static void acpiphp_sanitize_bus(struct pci_bus *bus);
> static void acpiphp_set_hpp_values(struct pci_bus *bus);
> +static void hotplug_event_func(acpi_handle handle, u32 type, void *context);
> static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
> static void free_bridge(struct kref *kref);
>
> @@ -147,7 +148,7 @@ static int post_dock_fixups(struct notif
>
>
> static const struct acpi_dock_ops acpiphp_dock_ops = {
> - .handler = handle_hotplug_event_func,
> + .handler = hotplug_event_func,
> };
>
> /* Check whether the PCI device is managed by native PCIe hotplug driver */
> @@ -179,6 +180,20 @@ static bool device_is_managed_by_native_
> return true;
> }
>
> +static void acpiphp_dock_init(void *data)
> +{
> + struct acpiphp_func *func = data;
> +
> + get_bridge(func->slot->bridge);
> +}
> +
> +static void acpiphp_dock_release(void *data)
> +{
> + struct acpiphp_func *func = data;
> +
> + put_bridge(func->slot->bridge);
> +}
> +
> /* callback routine to register each ACPI PCI slot object */
> static acpi_status
> register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
> @@ -298,7 +313,8 @@ register_slot(acpi_handle handle, u32 lv
> */
> newfunc->flags &= ~FUNC_HAS_EJ0;
> if (register_hotplug_dock_device(handle,
> - &acpiphp_dock_ops, newfunc))
> + &acpiphp_dock_ops, newfunc,
> + acpiphp_dock_init, acpiphp_dock_release))
> dbg("failed to register dock device\n");
>
> /* we need to be notified when dock events happen
> @@ -1068,22 +1084,12 @@ static void handle_hotplug_event_bridge(
> alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge);
> }
>
> -static void _handle_hotplug_event_func(struct work_struct *work)
> +static void hotplug_event_func(acpi_handle handle, u32 type, void *context)
> {
> - struct acpiphp_func *func;
> + struct acpiphp_func *func = context;
> char objname[64];
> struct acpi_buffer buffer = { .length = sizeof(objname),
> .pointer = objname };
> - struct acpi_hp_work *hp_work;
> - acpi_handle handle;
> - u32 type;
> -
> - hp_work = container_of(work, struct acpi_hp_work, work);
> - handle = hp_work->handle;
> - type = hp_work->type;
> - func = (struct acpiphp_func *)hp_work->context;
> -
> - acpi_scan_lock_acquire();
>
> acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
>
> @@ -1116,6 +1122,18 @@ static void _handle_hotplug_event_func(s
> warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
> break;
> }
> +}
> +
> +static void _handle_hotplug_event_func(struct work_struct *work)
> +{
> + struct acpi_hp_work *hp_work;
> + struct acpiphp_func *func;
> +
> + hp_work = container_of(work, struct acpi_hp_work, work);
> + func = hp_work->context;
> + acpi_scan_lock_acquire();
> +
> + hotplug_event_func(hp_work->handle, hp_work->type, func);
>
> acpi_scan_lock_release();
> kfree(hp_work); /* allocated in handle_hotplug_event_func */
>
--
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