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Message-ID: <12161362.vmNXQEUhXG@vostro.rjw.lan>
Date: Fri, 12 Jul 2013 01:54:57 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux PCI <linux-pci@...r.kernel.org>,
Yinghai Lu <yinghai@...nel.org>, Jiang Liu <liuj97@...il.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [RFC][PATCH 15/30] ACPI / hotplug / PCI: Embed function struct into struct acpiphp_context
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Since there has to be a struct acpiphp_func object for every struct
acpiphp_context created by register_slot(), the struct acpiphp_func
one can be embedded into the struct acpiphp_context one, which allows
some code simplifications to be made.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/pci/hotplug/acpiphp.h | 8 +++++--
drivers/pci/hotplug/acpiphp_glue.c | 42 +++++++++++++------------------------
2 files changed, 21 insertions(+), 29 deletions(-)
Index: linux-pm/drivers/pci/hotplug/acpiphp.h
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp.h
+++ linux-pm/drivers/pci/hotplug/acpiphp.h
@@ -113,7 +113,6 @@ struct acpiphp_slot {
* typically 8 objects per slot (i.e. for each PCI function)
*/
struct acpiphp_func {
- struct acpiphp_context *context;
struct acpiphp_slot *slot; /* parent */
struct list_head sibling;
@@ -126,11 +125,16 @@ struct acpiphp_func {
struct acpiphp_context {
acpi_handle handle;
- struct acpiphp_func *func;
+ struct acpiphp_func func;
struct acpiphp_bridge *bridge;
unsigned int refcount;
};
+static inline struct acpiphp_context *func_to_context(struct acpiphp_func *func)
+{
+ return container_of(func, struct acpiphp_context, func);
+}
+
/*
* struct acpiphp_attention_info - device specific attention registration
*
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
@@ -128,7 +128,7 @@ static void acpiphp_put_context(struct a
if (--context->refcount)
return;
- WARN_ON(context->func || context->bridge);
+ WARN_ON(context->bridge);
acpi_detach_data(context->handle, acpiphp_context_handler);
kfree(context);
}
@@ -155,12 +155,9 @@ static void free_bridge(struct kref *kre
bridge = container_of(kref, struct acpiphp_bridge, ref);
list_for_each_entry_safe(slot, next, &bridge->slots, node) {
- list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
- context = func->context;
- context->func = NULL;
- acpiphp_put_context(context);
- kfree(func);
- }
+ list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
+ acpiphp_put_context(func_to_context(func));
+
kfree(slot);
}
@@ -168,7 +165,7 @@ static void free_bridge(struct kref *kre
/* Root bridges will not have hotplug context. */
if (context) {
/* Release the reference taken by acpiphp_enumerate_slots(). */
- put_bridge(context->func->slot->bridge);
+ put_bridge(context->func.slot->bridge);
context->bridge = NULL;
acpiphp_put_context(context);
}
@@ -252,14 +249,14 @@ static void acpiphp_dock_init(void *data
{
struct acpiphp_context *context = data;
- get_bridge(context->func->slot->bridge);
+ get_bridge(context->func.slot->bridge);
}
static void acpiphp_dock_release(void *data)
{
struct acpiphp_context *context = data;
- put_bridge(context->func->slot->bridge);
+ put_bridge(context->func.slot->bridge);
}
/* callback routine to register each ACPI PCI slot object */
@@ -290,23 +287,16 @@ static acpi_status register_slot(acpi_ha
device = (adr >> 16) & 0xffff;
function = adr & 0xffff;
- newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
- if (!newfunc)
- return AE_NO_MEMORY;
-
- newfunc->handle = handle;
- newfunc->function = function;
-
mutex_lock(&acpiphp_context_lock);
context = acpiphp_init_context(handle);
if (!context) {
mutex_unlock(&acpiphp_context_lock);
acpi_handle_err(handle, "No hotplug context\n");
- kfree(newfunc);
return AE_NOT_EXIST;
}
- newfunc->context = context;
- context->func = newfunc;
+ newfunc = &context->func;
+ newfunc->handle = handle;
+ newfunc->function = function;
mutex_unlock(&acpiphp_context_lock);
if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
@@ -415,10 +405,8 @@ static acpi_status register_slot(acpi_ha
err:
mutex_lock(&acpiphp_context_lock);
- context->func = NULL;
acpiphp_put_context(context);
mutex_unlock(&acpiphp_context_lock);
- kfree(newfunc);
return status;
}
@@ -961,7 +949,7 @@ void acpiphp_check_host_bridge(acpi_hand
static void hotplug_event(acpi_handle handle, u32 type, void *data)
{
struct acpiphp_context *context = data;
- struct acpiphp_func *func = context->func;
+ struct acpiphp_func *func = &context->func;
struct acpiphp_bridge *bridge;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
@@ -1052,7 +1040,7 @@ static void hotplug_event_work(struct wo
acpi_scan_lock_release();
kfree(hp_work); /* allocated in handle_hotplug_event() */
- put_bridge(context->func->slot->bridge);
+ put_bridge(context->func.slot->bridge);
}
/**
@@ -1070,7 +1058,7 @@ static void handle_hotplug_event(acpi_ha
mutex_lock(&acpiphp_context_lock);
context = acpiphp_get_context(handle);
if (context) {
- get_bridge(context->func->slot->bridge);
+ get_bridge(context->func.slot->bridge);
acpiphp_put_context(context);
}
mutex_unlock(&acpiphp_context_lock);
@@ -1132,7 +1120,7 @@ void acpiphp_enumerate_slots(struct pci_
*/
mutex_lock(&acpiphp_context_lock);
context = acpiphp_get_context(handle);
- if (WARN_ON(!context || !context->func)) {
+ if (WARN_ON(!context)) {
mutex_unlock(&acpiphp_context_lock);
put_device(&bus->dev);
kfree(bridge);
@@ -1141,7 +1129,7 @@ void acpiphp_enumerate_slots(struct pci_
bridge->context = context;
context->bridge = bridge;
/* Get a reference to the parent bridge. */
- get_bridge(context->func->slot->bridge);
+ get_bridge(context->func.slot->bridge);
mutex_unlock(&acpiphp_context_lock);
}
--
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