From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Perches <joe@perches.com>
Subject: Re: [PATCH 1/4] ACPI: Add acpi_pr_<level>() interfaces
Date: Wed, 18 Jul 2012 14:27:56 -0700
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To: Toshi Kani <toshi.kani@hp.com>
Cc: lenb@kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, bhelgaas@google.com, isimatu.yasuaki@jp.fujitsu.com, liuj97@gmail.com, srivatsa.bhat@linux.vnet.ibm.com, prarit@redhat.com, imammedo@redhat.com, vijaymohan.pandarathil@hp.com

On Wed, 2012-07-18 at 14:40 -0600, Toshi Kani wrote:
> This patch introduces acpi_pr_<level>(), where <level> is a message
> level such as err/warn/info, to support improved logging messages
> for ACPI, esp. in hotplug operations.

One more note:

> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
[]
> @@ -454,3 +454,35 @@ acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
[]
> +void
> +acpi_printk(const char *level, acpi_handle handle, const char *fmt, ...)
[]
> +	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
[]
> +	ret = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
[]
> +	kfree(buffer.pointer);

There's a failure mode here because buffer.pointer
isn't guaranteed to be initialized or set to NULL.