linux-kernel - Re: [RFC PATCH 06/13] driver core: firmware loader: always let firmware

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Message-ID: <CACVXFVOyfotorQFMirv9kMeT0SDmxzo_MLAk8uvWf8wK=x3YpA@mail.gmail.com>
Date:	Fri, 3 Aug 2012 16:34:45 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Borislav Petkov <bp@...64.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 06/13] driver core: firmware loader: always let
 firmware_buf own the pages buffer

On Wed, Jul 25, 2012 at 10:37 PM, Borislav Petkov <bp@...64.org> wrote:
> On Wed, Jul 25, 2012 at 01:00:06AM +0800, Ming Lei wrote:

>> @@ -213,13 +291,8 @@ static ssize_t firmware_loading_show(struct device *dev,
>>  /* firmware holds the ownership of pages */
>>  static void firmware_free_data(const struct firmware *fw)
>>  {
>> -     int i;
>> -     vunmap(fw->data);
>> -     if (fw->pages) {
>> -             for (i = 0; i < PFN_UP(fw->size); i++)
>> -                     __free_page(fw->pages[i]);
>> -             kfree(fw->pages);
>> -     }
>> +     WARN_ON(!fw->priv);
>> +     fw_free_buf(fw->priv);
>
> Why the WARN_ON?

Because the 'struct firmware' instance is exposed to drivers, it is
better to warn if some drivers clear it during request&release.

Thanks,
--
Ming Lei
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