linux-kernel - Re: [PATCH 1/4] mtd: brcmnand: improve memory management

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Date:	Thu, 19 Nov 2015 11:26:32 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	kernel-janitors@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com,
	linux-kernel@...r.kernel.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jason Cooper <jason@...edaemon.net>,
	Kamal Dasu <kdasu.kdev@...il.com>
Subject: Re: [PATCH 1/4] mtd: brcmnand: improve memory management

On Thu, Nov 19, 2015 at 07:13:45AM +0100, Julia Lawall wrote:
> On Wed, 18 Nov 2015, Brian Norris wrote:
> > On Wed, Nov 18, 2015 at 11:04:11PM +0100, Julia Lawall wrote:
> > > 3. If the continue is not taken, then host is added to a list, that has a
> > > lifetime beyond the end of the for_each_available_child_of_node loop body.
> > > Thus, of_node_get is needed on child, which is referenced by host.  A
> > > corresponding of_node_put is needed in the remove function.
> > 
> > This one's a bit silly. We really shouldn't be keeping the reference in
> > 'host' at all. Also, as of commit 215a02fd3087 ("mtd: grab a reference to
> > the MTD of_node before registering it"), the MTD core will actually be
> > refcounting the node for us, too, so this isn't really necessary.
> > 
> > I have a patch to remove brcmnand_host::of_node (appended below), which
> > should make this step obsolete, and be more obvious that no extra
> > of_node_get()'ing is required.
> 
> OK.  Should I resend my patch without this change?

Sure, that'd be good. Then I could merge/rebase mine on top.

Thanks,
Brian
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