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[PATCH] PCI: Reduce nr of ptr derefs in drivers/pci/hotplug/pciehp_core.c

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Here's a small patch to reduce the nr. of pointer dereferences in
drivers/pci/hotplug/pciehp_core.c

Benefits:
 - micro speed optimization due to fewer pointer derefs
 - generated code is slightly smaller
 - small line length cleanup
 - better readability

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jesper Juhl 2005-12-11 06:41:42 +01:00 committed by Greg Kroah-Hartman
parent c2dea65530
commit 121082e2ab
1 changed files with 48 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
drivers/pci/hotplug/pciehp_core.c
View File

@ -103,7 +103,10 @@ static void release_slot(struct hotplug_slot *hotplug_slot)
static int init_slots(struct controller *ctrl)
{
struct slot *new_slot;
struct slot *slot;
struct hpc_ops *hpc_ops;
struct hotplug_slot *hotplug_slot;
struct hotplug_slot_info *hotplug_slot_info;
u8 number_of_slots;
u8 slot_device;
u32 slot_number;
@ -114,59 +117,66 @@ static int init_slots(struct controller *ctrl)
slot_number = ctrl->first_slot;
while (number_of_slots) {
new_slot = kmalloc(sizeof(*new_slot), GFP_KERNEL);
if (!new_slot)
slot = kmalloc(sizeof(*slot), GFP_KERNEL);
if (!slot)
goto error;
memset(new_slot, 0, sizeof(struct slot));
new_slot->hotplug_slot =
kmalloc(sizeof(*(new_slot->hotplug_slot)),
memset(slot, 0, sizeof(struct slot));
slot->hotplug_slot =
kmalloc(sizeof(*(slot->hotplug_slot)),
GFP_KERNEL);
if (!new_slot->hotplug_slot)
if (!slot->hotplug_slot)
goto error_slot;
memset(new_slot->hotplug_slot, 0, sizeof(struct hotplug_slot));
hotplug_slot = slot->hotplug_slot;
memset(hotplug_slot, 0, sizeof(struct hotplug_slot));
new_slot->hotplug_slot->info =
kmalloc(sizeof(*(new_slot->hotplug_slot->info)),
hotplug_slot->info =
kmalloc(sizeof(*(hotplug_slot->info)),
GFP_KERNEL);
if (!new_slot->hotplug_slot->info)
if (!hotplug_slot->info)
goto error_hpslot;
memset(new_slot->hotplug_slot->info, 0,
hotplug_slot_info = hotplug_slot->info;
memset(hotplug_slot_info, 0,
sizeof(struct hotplug_slot_info));
new_slot->hotplug_slot->name = kmalloc(SLOT_NAME_SIZE,
GFP_KERNEL);
if (!new_slot->hotplug_slot->name)
hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
if (!hotplug_slot->name)
goto error_info;
new_slot->ctrl = ctrl;
new_slot->bus = ctrl->slot_bus;
new_slot->device = slot_device;
new_slot->hpc_ops = ctrl->hpc_ops;
slot->ctrl = ctrl;
slot->bus = ctrl->slot_bus;
slot->device = slot_device;
slot->hpc_ops = hpc_ops = ctrl->hpc_ops;
new_slot->number = ctrl->first_slot;
new_slot->hp_slot = slot_device - ctrl->slot_device_offset;
slot->number = ctrl->first_slot;
slot->hp_slot = slot_device - ctrl->slot_device_offset;
/* register this slot with the hotplug pci core */
new_slot->hotplug_slot->private = new_slot;
new_slot->hotplug_slot->release = &release_slot;
make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
new_slot->hotplug_slot->ops = &pciehp_hotplug_slot_ops;
hotplug_slot->private = slot;
hotplug_slot->release = &release_slot;
make_slot_name(hotplug_slot->name, SLOT_NAME_SIZE, slot);
hotplug_slot->ops = &pciehp_hotplug_slot_ops;
new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));
hpc_ops->get_power_status(slot,
&(hotplug_slot_info->power_status));
hpc_ops->get_attention_status(slot,
&(hotplug_slot_info->attention_status));
hpc_ops->get_latch_status(slot,
&(hotplug_slot_info->latch_status));
hpc_ops->get_adapter_status(slot,
&(hotplug_slot_info->adapter_status));
dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n",
new_slot->bus, new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
result = pci_hp_register (new_slot->hotplug_slot);
dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
"slot_device_offset=%x\n",
slot->bus, slot->device, slot->hp_slot, slot->number,
ctrl->slot_device_offset);
result = pci_hp_register(hotplug_slot);
if (result) {
err ("pci_hp_register failed with error %d\n", result);
goto error_name;
}
new_slot->next = ctrl->slot;
ctrl->slot = new_slot;
slot->next = ctrl->slot;
ctrl->slot = slot;
number_of_slots--;
slot_device++;
@ -176,13 +186,13 @@ static int init_slots(struct controller *ctrl)
return 0;
error_name:
kfree(new_slot->hotplug_slot->name);
kfree(hotplug_slot->name);
error_info:
kfree(new_slot->hotplug_slot->info);
kfree(hotplug_slot_info);
error_hpslot:
kfree(new_slot->hotplug_slot);
kfree(hotplug_slot);
error_slot:
kfree(new_slot);
kfree(slot);
error:
return result;
}