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PCI: pciehp: Rename duplicate slot name N as N-1, N-2, N-M...

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Commit 3800345f72 (pciehp: fix slot name)
introduces the pciehp_slot_with_bus module parameter, which was intended
to help work around broken firmware that assigns the same name to multiple
slots.

Commit 9e4f2e8d4d (pciehp: add message about
pciehp_slot_with_bus option) tells the user to use the above parameter
in the event of a name collision.

This approach is sub-optimal because it requires too much work from
the user.

Instead, let's rename the slot on behalf of the user. If firmware
assigns the name N to multiple slots, then:

	The first registered slot is assigned N
	The second registered slot is assigned N-1
	The third registered slot is assigned N-2
	The Mth registered slot becomes N-M

In the event we overflow the slot->name parameter, we report an
error to the user.

This is a temporary fix until the entire PCI core can be reworked
such that individual drivers no longer have to manage their own
slot names.

Tested-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Alex Chiang
2008-08-21 15:13:29 -06:00
committed by Jesse Barnes
parent 6a55617ed5
commit 167e782e30
3 changed files with 15 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/pci/hotplug/pciehp_core.c
View File

@ -41,7 +41,6 @@ int pciehp_debug;
int pciehp_poll_mode;
int pciehp_poll_time;
int pciehp_force;
int pciehp_slot_with_bus;
struct workqueue_struct *pciehp_wq;
#define DRIVER_VERSION "0.4"
@ -56,12 +55,10 @@ module_param(pciehp_debug, bool, 0644);
module_param(pciehp_poll_mode, bool, 0644);
module_param(pciehp_poll_time, int, 0644);
module_param(pciehp_force, bool, 0644);
module_param(pciehp_slot_with_bus, bool, 0644);
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
MODULE_PARM_DESC(pciehp_slot_with_bus, "Use bus number in the slot name");
#define PCIE_MODULE_NAME "pciehp"
@ -194,6 +191,7 @@ static int init_slots(struct controller *ctrl)
struct slot *slot;
struct hotplug_slot *hotplug_slot;
struct hotplug_slot_info *info;
int len, dup = 1;
int retval = -ENOMEM;
list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
@ -220,15 +218,24 @@ static int init_slots(struct controller *ctrl)
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);
duplicate_name:
retval = pci_hp_register(hotplug_slot,
ctrl->pci_dev->subordinate,
slot->device);
if (retval) {
/*
* If slot N already exists, we'll try to create
* slot N-1, N-2 ... N-M, until we overflow.
*/
if (retval == -EEXIST) {
len = snprintf(slot->name, SLOT_NAME_SIZE,
"%d-%d", slot->number, dup++);
if (len < SLOT_NAME_SIZE)
goto duplicate_name;
else
err("duplicate slot name overflow\n");
}
err("pci_hp_register failed with error %d\n", retval);
if (retval == -EEXIST)
err("Failed to register slot because of name "
"collision. Try \'pciehp_slot_with_bus\' "
"module option.\n");
goto error_info;
}
/* create additional sysfs entries */