linux-kernel - Re: [PATCH] pci: Make pci

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Date:	Fri, 4 Dec 2009 13:27:09 -0700
From:	Alex Chiang <achiang@...com>
To:	Rakib Mullick <rakib.mullick@...il.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, linux-pci@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] pci: Make pci_dev struct point to NULL.

* Rakib Mullick <rakib.mullick@...il.com>:
>  pci: Make pci_dev struct point to NULL.
> 
> In function enable_device of acpiphp_glue.c, structure pci_dev
> doesn't point anything. Due to the check in line 975 we might
> end up being uninitialized. So make it point to NULL.
> 
> ---
> Signed-off-by: Rakib Mullick <rakib.mullick@...il.com>
> 
> --- linus/drivers/pci/hotplug/acpiphp_glue.c	2009-12-03 21:30:57.000000000 +0600
> +++ rakib/drivers/pci/hotplug/acpiphp_glue.c	2009-12-03 23:53:44.000000000 +0600
> @@ -964,7 +964,7 @@ static int acpiphp_bus_trim(acpi_handle
>   */
>  static int __ref enable_device(struct acpiphp_slot *slot)
>  {
> -	struct pci_dev *dev;
> +	struct pci_dev *dev = NULL;
>  	struct pci_bus *bus = slot->bridge->pci_bus;
>  	struct list_head *l;
>  	struct acpiphp_func *func;

This is from Linus's latest tree:

 965 static int __ref enable_device(struct acpiphp_slot *slot)
 966 {
 967         struct pci_dev *dev;
 968         struct pci_bus *bus = slot->bridge->pci_bus;
 969         struct list_head *l;
 970         struct acpiphp_func *func;
 971         int retval = 0;
 972         int num, max, pass;
 973         acpi_status status;
 974 
 975         if (slot->flags & SLOT_ENABLED)
 976                 goto err_exit;
 977 
 978         /* sanity check: dev should be NULL when hot-plugged in */
 979         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
 980         if (dev) {

I assume your line 975 is my line 980.

pci_get_slot() returns NULL if it doesn't find the devfn, so as
far as I can tell, there's no need to initialize dev to NULL.

Were you fixing a real bug with this patch? Did you actually get
the "pci_dev structure already exists.\n" error message?

Thanks,
/ac
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