linux-kernel - Re: [PATCH v3 02/14] PCI: prevent duplicate slot names

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Date:	Tue, 30 Sep 2008 11:06:55 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Alex Chiang <achiang@...com>
CC:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbarnes@...tuousgeek.org, kristen.c.accardi@...el.com,
	matthew@....cx
Subject: Re: [PATCH v3 02/14] PCI: prevent duplicate slot names

It seems my previous e-mail was not sent properly. So resending it.

Thanks,
Kenji Kaneshige

Kenji Kaneshige wrote:
> Hi Alex-san,
> 
> Here is one comment, though I have not finished reviewing/testing
> your patches yet (sorry for the delay).
> 
> Alex Chiang wrote:
> 
> (snip.)
> 
>> diff --git a/drivers/pci/hotplug/pci_hotplug_core.c 
>> b/drivers/pci/hotplug/pci_hotplug_core.c
>> index 3e37d63..46802dc 100644
>> --- a/drivers/pci/hotplug/pci_hotplug_core.c
>> +++ b/drivers/pci/hotplug/pci_hotplug_core.c
>> @@ -570,39 +570,32 @@ int pci_hp_register(struct hotplug_slot *slot, 
>> struct pci_bus *bus, int slot_nr,
>>          return -EINVAL;
>>      }
>>  
>> -    /* Check if we have already registered a slot with the same name. */
>> -    if (get_slot_from_name(name))
>> -        return -EEXIST;
>> -
>>      /*
>> -     * No problems if we call this interface from both ACPI_PCI_SLOT
>> -     * driver and call it here again. If we've already created the
>> -     * pci_slot, the interface will simply bump the refcount.
>> +     * Look for existing slot. If we find it, and it was created by a
>> +     * slot detection driver (ie, doesn't have a ->hotplug()) then we
>> +     * allow the hotplug driver calling us to rename the slot if 
>> desired.
>> +     *
>> +     * Otherwise, create the slot and carry on with life.
>>       */
>> -    pci_slot = pci_create_slot(bus, slot_nr, name);
>> -    if (IS_ERR(pci_slot))
>> -        return PTR_ERR(pci_slot);
>> -
>> -    if (pci_slot->hotplug) {
>> -        dbg("%s: already claimed\n", __func__);
>> -        pci_destroy_slot(pci_slot);
>> -        return -EBUSY;
>> +    pci_slot = pci_get_pci_slot(bus, slot_nr);
> 
> The pci_get_pci_slot() function refers pci_bus->slots list, so it
> should be called with pci_bus_sem semaphore held as pci_create_slot()
> does, or pci_bus_sem semaphore should be held by pci_get_pci_slot()
> itself.
> 
> Thanks,
> Kenji Kaneshige
> 


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