linux-kernel - Re: [PATCH v3] firmware_class: fix memory leak

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Date:	Tue, 4 May 2010 20:07:33 +0530 (IST)
From:	Pavan Savoy <pavan_savoy@...oo.co.in>
To:	Greg KH <greg@...ah.com>
Cc:	Tomas Winkler <tomas.winkler@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] firmware_class: fix memory leak - free allocated pages


--- On Tue, 4/5/10, Greg KH <greg@...ah.com> wrote:

> From: Greg KH <greg@...ah.com>
> Subject: Re: [PATCH v3] firmware_class: fix memory leak - free allocated pages
> To: "Pavan Savoy" <pavan_savoy@...oo.co.in>
> Cc: "Tomas Winkler" <tomas.winkler@...el.com>, linux-kernel@...r.kernel.org
> Date: Tuesday, 4 May, 2010, 7:33 PM
> On Tue, May 04, 2010 at 12:16:44AM
> +0530, Pavan Savoy wrote:
> > 
> > 
> > --- On Mon, 3/5/10, Greg KH <greg@...ah.com>
> wrote:
> > 
> > > From: Greg KH <greg@...ah.com>
> > > Subject: Re: [PATCH v3] firmware_class: fix
> memory leak - free allocated pages
> > > To: "Tomas Winkler" <tomas.winkler@...el.com>
> > > Cc: "Greg Kroah-Hartman" <gregkh@...e.de>,
> linux-kernel@...r.kernel.org,
> "David Woodhouse" <dwmw2@...radead.org>,
> "Kay Sievers" <kay.sievers@...y.org>,
> "David Woodhouse" <David.Woodhouse@...el.com>,
> "Johannes Berg" <johannes@...solutions.net>,
> "Ming Lei" <tom.leiming@...il.com>,
> "Catalin Marinas" <catalin.marinas@....com>
> > > Date: Monday, 3 May, 2010, 10:34 PM
> > > On Sun, May 02, 2010 at 11:21:21AM
> > > +0300, Tomas Winkler wrote:
> > > > From: David Woodhouse <David.Woodhouse@...el.com>
> > > > 
> > > > fix memory leak introduced by the patch
> 6e03a201bbe:
> > > > firmware: speed up request_firmware()
> > > > 
> > > > 1. vfree won't release pages there were
> allocated
> > > explicitly and mapped
> > > > using vmap. The memory has to be vunmap-ed
> and the
> > > pages needs
> > > > to be freed explicitly
> > > > 
> > > > 2. page array is moved into the 'struct
> > > > firmware' so that we can free it from
> > > release_firmware()
> > > > and not only in fw_dev_release()
> > > > 
> > > > The fix doesn't break the firmware load
> speed.
> > > > 
> > > > Cc: Johannes Berg <johannes@...solutions.net>
> > > > Cc: Greg Kroah-Hartman <gregkh@...e.de>
> > > > Cc: Ming Lei <tom.leiming@...il.com>
> > > > Cc: Catalin Marinas <catalin.marinas@....com>
> > > > Singed-off-by: Kay Sievers <kay.sievers@...y.org>
> > > > Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
> > > > Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> > > > ---
> > > > V2: fix authorship of the patch
> > > > V3: fix const struct firmware breakage
> > > 
> > > Thanks, this looks much better, I've applied it
> now.
> > 
> > Sorry to bump-in the middle.
> > But as a user of firmware class, what should now my
> fw_entry structure be?
> > const struct firmware *fw_entry or,
> > struct firmware *fw_entry - without the const ..
> 
> You should leave it to be whatever it was before this
> patch, it has not
> changed anything now.

Ok, However this patch has changed the release_firmware,
-release_firmware(const struct firmware *fw)
+release_firmware(struct firmware *fw)


> thanks,
> 
> greg k-h
> 


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