linux-kernel - Re: [PATCH v4 13/52] PCI, acpiphp: Add missing realloc list checking after resource allocation

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Message-ID: <205780224.0d92UNafyF@vostro.rjw.lan>
Date:	Tue, 25 Aug 2015 00:09:29 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v4 13/52] PCI, acpiphp: Add missing realloc list checking after resource allocation

On Thursday, August 20, 2015 11:20:28 PM Yinghai Lu wrote:
> We check the realloc list, as list must be empty after allocation.
> 
> Add missing one acpiphp driver.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-acpi@...r.kernel.org
> ---
>  drivers/pci/hotplug/acpiphp_glue.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
> index ff53856..1c7c1d7 100644
> --- a/drivers/pci/hotplug/acpiphp_glue.c
> +++ b/drivers/pci/hotplug/acpiphp_glue.c
> @@ -507,6 +507,7 @@ static void enable_slot(struct acpiphp_slot *slot)
>  		}
>  	}
>  	__pci_bus_assign_resources(bus, &add_list, NULL);
> +	BUG_ON(!list_empty(&add_list));

Is crashing the kernel the best we can do here?

What about bailing out with a WARN_ON() instead?  Surely, the kernel can work
without the new device?

>  
>  	acpiphp_sanitize_bus(bus);
>  	pcie_bus_configure_settings(bus);
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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