linux-kernel - Re: [PATCH] cxl: replace loop with for_each_child_of_node(), remove unneeded of_node

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Message-ID: <alpine.DEB.2.10.1607291049380.2161@hadrien>
Date:	Fri, 29 Jul 2016 10:49:54 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	walter harms <wharms@....de>
cc:	Andrew Donnellan <andrew.donnellan@....ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, imunsie@....ibm.com,
	fbarrat@...ux.vnet.ibm.com, clombard@...ux.vnet.ibm.com,
	kernel-janitors@...r.kernel.org, elfring@...rs.sourceforge.net,
	julia.lawall@...6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cxl: replace loop with for_each_child_of_node(), remove
 unneeded of_node_put()



On Fri, 29 Jul 2016, walter harms wrote:

>
>
> Am 29.07.2016 05:55, schrieb Andrew Donnellan:
> > Rewrite the cxl_guest_init_afu() loop in cxl_of_probe() to use
> > for_each_child_of_node() rather than a hand-coded for loop.
> >
> > Remove the useless of_node_put(afu_np) call after the loop, where it's
> > guaranteed that afu_np == NULL.
> >
> > Reported-by: SF Markus Elfring <elfring@...rs.sourceforge.net>
> > Reported-by: Julia Lawall <julia.lawall@...6.fr>
> > Signed-off-by: Andrew Donnellan <andrew.donnellan@....ibm.com>
> >
> > ---
> >
> > Checked the of_node_put() with Fred, he thinks it was probably just left
> > over from an earlier private version of the code and we can just get rid of
> > it.
> > ---
> >  drivers/misc/cxl/of.c | 8 +++-----
> >  1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/misc/cxl/of.c b/drivers/misc/cxl/of.c
> > index edc4583..ec175ea 100644
> > --- a/drivers/misc/cxl/of.c
> > +++ b/drivers/misc/cxl/of.c
> > @@ -460,7 +460,7 @@ int cxl_of_probe(struct platform_device *pdev)
> >  	struct device_node *afu_np = NULL;
> >  	struct cxl *adapter = NULL;
> >  	int ret;
> > -	int slice, slice_ok;
> > +	int slice = 0, slice_ok = 0;
> >
> >  	pr_devel("in %s\n", __func__);
> >
> > @@ -476,13 +476,13 @@ int cxl_of_probe(struct platform_device *pdev)
> >  	}
> >
> >  	/* init afu */
> > -	slice_ok = 0;
> > -	for (afu_np = NULL, slice = 0; (afu_np = of_get_next_child(np, afu_np)); slice++) {
> > +	for_each_child_of_node(np, afu_np) {
> >  		if ((ret = cxl_guest_init_afu(adapter, slice, afu_np)))
> >  			dev_err(&pdev->dev, "AFU %i failed to initialise: %i\n",
> >  				slice, ret);
> >  		else
> >  			slice_ok++;
> > +		slice++;
> >  	}
>
> while you are here ..
> you could move the assign out of the condition..
>
> ret = cxl_guest_init_afu(adapter, slice, afu_np);
> if (ret) ....

Yes, please.

julia


>
> just my 2 cents,
>
> re,
>  wh
>
> >
> >  	if (slice_ok == 0) {
> > @@ -490,8 +490,6 @@ int cxl_of_probe(struct platform_device *pdev)
> >  		adapter->slices = 0;
> >  	}
> >
> > -	if (afu_np)
> > -		of_node_put(afu_np);
> >  	return 0;
> >  }
> >
> --
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