linux-kernel - Re: ACPI boot memory leaks in 2.6.32-rc1/2

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Date:	Tue, 29 Sep 2009 22:12:07 +0200
From:	Zdenek Kabelac <zdenek.kabelac@...il.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com
Subject: Re: ACPI boot memory leaks in 2.6.32-rc1/2

2009/9/29 Bjorn Helgaas <bjorn.helgaas@...com>:
> On Tuesday 29 September 2009 03:18:53 am Zdenek Kabelac wrote:
>> My qemu guest seems to be reporting now 46 memleaks  ACPI related.
>
> Thanks a lot for the report!
>
> Can you verify that the patch below fixes these leaks?
>

Yes - leaks are fixed with this patch

>
> commit fff7774a805e392ce258f0342e48cbe682ef2b9b
> Author: Bjorn Helgaas <bjorn.helgaas@...com>
> Date:   Tue Sep 29 10:32:19 2009 -0600
>
>    ACPI: fix bus scanning memory leaks
>
>    Free an acpi_get_object_info() buffer when we're finished.  Skip the
>    acpi_get_name() altogether -- it was only used for a printk that was
>    really just for debug anyway.
>
>    Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
>    Reported-by: Zdenek Kabelac <zdenek.kabelac@...il.com>


Reported-and-tested-by: Zdenek Kabelac <zdenek.kabelac@...il.com>

>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 468921b..14a7481 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1052,6 +1052,8 @@ static void acpi_device_set_id(struct acpi_device *device)
>                        device->flags.bus_address = 1;
>                }
>
> +               kfree(info);
> +
>                /*
>                 * Some devices don't reliably have _HIDs & _CIDs, so add
>                 * synthetic HIDs to make sure drivers can find them.
> @@ -1325,13 +1327,8 @@ static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
>                         struct acpi_device **child)
>  {
>        acpi_status status;
> -       struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
>        void *device = NULL;
>
> -       acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
> -       printk(KERN_INFO PREFIX "Enumerating devices from [%s]\n",
> -              (char *) buffer.pointer);
> -
>        status = acpi_bus_check_add(handle, 0, ops, &device);
>        if (ACPI_SUCCESS(status))
>                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
>
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