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

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Date:	Sat, 5 Dec 2009 07:53:05 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Alex Chiang <achiang@...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.

On 12/5/09, Alex Chiang <achiang@...com> wrote:
> * Rakib Mullick <rakib.mullick@...il.com>:
>
> This is from Linus's latest tree:
>
>   974
>   975         if (slot->flags & SLOT_ENABLED)
>   976                 goto err_exit;

I'm talking about this line. From here we can hit 'goto err_exit' without
using pci_get_slot.

>   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.

Nope, my line 975 is also yours.
>
>  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?
>
No - i'm trying to make sure that we're not referencing into a trash.

>  Thanks,
>
> /ac
>
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