linux-kernel - Re: [PATCH] leds: pca9532: fix device_node

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Date:   Fri, 30 Dec 2016 17:24:56 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
cc:     Julia Lawall <julia.lawall@...6.fr>,
        Joachim Eastwood <manabian@...il.com>,
        Riku Voipio <riku.voipio@....fi>,
        Richard Purdie <rpurdie@...ys.net>,
        Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, kbuild-all@...org,
        fengguang.wu@...el.com
Subject: Re: [PATCH] leds: pca9532: fix device_node_continue.cocci warnings



On Fri, 30 Dec 2016, Jacek Anaszewski wrote:

> On 12/29/2016 10:39 PM, Julia Lawall wrote:
> >
> >
> > On Thu, 29 Dec 2016, Jacek Anaszewski wrote:
> >
> >> Hi Julia,
> >>
> >> This patch doesn't apply to current for-next branch
> >> of linux-leds.git.
> >
> > The information about where it comes from is below the ---.  It's
> > automatically send to me by kbuild, so I don't know anything more than
> > that.  I recall from the original message that the code was committed
> > around an hour ago.
>
> In mainline as well as in linux-next we have only the following patch
> touching pca9532_of_populate_pdata() (it adds the function):
>
> commit fa4191a609f219262a18dd8b02ab7dc30896b707
> Author: Phil Reid <preid@...ctromag.com.au>
> Date:   Tue Jun 14 15:36:17 2016 +0800
>
>     leds: pca9532: Add device tree support
>
>     This patch adds basic device tree support for the pca9532 LEDs.
>
>     Signed-off-by: Phil Reid <preid@...ctromag.com.au>
>     Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
>
>
> It doesn't have the problems the kbuild detected in
> https://github.com/manabian/linux-lpc lpc18xx_43xx_devel.
> The git history for leds-pca9532.c in that repository is
> different from the one in mainline.
>
> I don't see a point in reporting problems in repositories
> other than mainline or linux-next.

I think you can let Fengguang know which trees you want monitored:

fengguang.wu@...el.com

julia


>
> Best regards,
> Jacek Anaszewski
>
>
> >>
> >> On 12/29/2016 10:10 PM, Julia Lawall wrote:
> >>> Device node iterators put the previous value of the index variable, so an
> >>> explicit put causes a double put.
> >>>
> >>> Generated by: scripts/coccinelle/iterators/device_node_continue.cocci
> >>>
> >>> Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
> >>> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> >>> ---
> >>>
> >>> I haven't looked at the context in detail, but given the rule, I assume
> >>> that there is an iterator, such as for_each_child_of_node, and these
> >>> iterators do a put on each iteration, so none is needed in the loop body.
> >>>
> >>> tree:   https://github.com/manabian/linux-lpc lpc18xx_43xx_devel
> >>> head:   9ee5f58bbb16c08da223c4b4933457e0eb72268d
> >>> commit: c58957273142be779f62c17fae389ce9c134139f [44/55] leds: pca9532: use
> >>>
> >>>  leds-pca9532.c |    3 ---
> >>>  1 file changed, 3 deletions(-)
> >>>
> >>> --- a/drivers/leds/leds-pca9532.c
> >>> +++ b/drivers/leds/leds-pca9532.c
> >>> @@ -473,7 +473,6 @@ pca9532_of_populate_pdata(struct device
> >>>
> >>>  		res = of_property_read_u32(child, "reg", &reg);
> >>>  		if ((res != 0) || (reg >= maxleds)) {
> >>> -			of_node_put(child);
> >>>  			continue;
> >>>  		}
> >>>
> >>> @@ -484,8 +483,6 @@ pca9532_of_populate_pdata(struct device
> >>>  		of_property_read_u32(child, "type", &pdata->leds[reg].type);
> >>>  		of_property_read_string(child, "linux,default-trigger",
> >>>  					&pdata->leds[reg].default_trigger);
> >>> -
> >>> -		of_node_put(child);
> >>>  	}
> >>>
> >>>  	return pdata;
> >>>
> >>
> >>
> >
>
> --
> Best regards,
> Jacek Anaszewski
>