linux-kernel - Re: [PATCH 1/4] ACPI: Add acpi_pr

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Date:	Wed, 18 Jul 2012 15:41:56 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Joe Perches <joe@...ches.com>
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
	isimatu.yasuaki@...fujitsu.com, liuj97@...il.com,
	srivatsa.bhat@...ux.vnet.ibm.com, prarit@...hat.com,
	imammedo@...hat.com, vijaymohan.pandarathil@...com
Subject: Re: [PATCH 1/4] ACPI: Add acpi_pr_<level>() interfaces

On Wed, 2012-07-18 at 14:27 -0700, Joe Perches wrote:
> 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.

Hi Joe,

Yes, I thought that check was necessary as well.  However, to my
surprise, such check caused the following warning message from
patchcheck.pl.  So, I deleted the check...

# check for needless kfree() checks
                if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
                        my $expr = $1;
                        if ($line =~ /\bkfree\(\Q$expr\E\);/) {
                                WARN("NEEDLESS_KFREE",
                                     "kfree(NULL) is safe this check is
probably not required\n" . $hereprev);
                        }
                }

Thanks,
-Toshi

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