Re: [PATCH] soc: rockchip: power-domain: Handle errors from of_genpd_add_provider_onecell

From: "Heiko Stübner" <heiko@sntech.de>
To: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: linux-kernel@vger.kernel.org, Caesar Wang <wxt@rock-chips.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org
Subject: Re: [PATCH] soc: rockchip: power-domain: Handle errors from of_genpd_add_provider_onecell
Date: Thu, 15 Sep 2016 16:39:34 +0200	[thread overview]
Message-ID: <14744126.0kYUlUJ0mc@diego> (raw)
In-Reply-To: <1473936221-9248-1-git-send-email-tomeu.vizoso@collabora.com>

Am Donnerstag, 15. September 2016, 12:43:41 schrieb Tomeu Vizoso:
> It was a bit surprising that the device was reported to have probed just
> fine, but the provider hadn't been registered.
> 
> So handle any errors when registering the provider and fail the probe
> accordingly.
> 
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
> Cc: Caesar Wang <wxt@rock-chips.com>
> ---
>  drivers/soc/rockchip/pm_domains.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/rockchip/pm_domains.c
> b/drivers/soc/rockchip/pm_domains.c index 7acd1517dd37..57e920128cb2 100644
> --- a/drivers/soc/rockchip/pm_domains.c
> +++ b/drivers/soc/rockchip/pm_domains.c
> @@ -627,7 +627,11 @@ static int rockchip_pm_domain_probe(struct
> platform_device *pdev) goto err_out;
>  	}
> 
> -	of_genpd_add_provider_onecell(np, &pmu->genpd_data);
> +	error = of_genpd_add_provider_onecell(np, &pmu->genpd_data);
> +	if (error) {
> +		dev_err(dev, "failed to add provider: %d\n", error);
> +		goto err_out;
> +	}
> 
>  	return 0;

Looks good in itself, but seems to trigger some issue in the genpd code
when applied alone on top of linux-next-20160915. Looks like genpd
is missing counter-initialization somewhere, as I'm seeing now:

[    1.664744] genpd_poweroff_unused disabling (null)
[    1.669553] ------------[ cut here ]------------
[    1.674169] WARNING: CPU: 0 PID: 1 at ../kernel/workqueue.c:1440 __queue_work+0x2b8/0x3f8
[    1.682337] Modules linked in:
[    1.685401] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-rc6-next-20160915-00001-g7432710-dirty #5
[    1.694608] Hardware name: Rockchip (Device Tree)
[    1.699312] [<c0310388>] (unwind_backtrace) from [<c030ba04>] (show_stack+0x10/0x14)
[    1.707050] [<c030ba04>] (show_stack) from [<c0599c90>] (dump_stack+0x90/0xa4)
[    1.714267] [<c0599c90>] (dump_stack) from [<c0341bc0>] (__warn+0xe8/0x100)
[    1.721221] [<c0341bc0>] (__warn) from [<c0341c88>] (warn_slowpath_null+0x20/0x28)
[    1.728785] [<c0341c88>] (warn_slowpath_null) from [<c0355b28>] (__queue_work+0x2b8/0x3f8)
[    1.737041] [<c0355b28>] (__queue_work) from [<c0355ca8>] (queue_work_on+0x40/0x4c)
[    1.744692] [<c0355ca8>] (queue_work_on) from [<c103e8b8>] (genpd_poweroff_unused+0x78/0x9c)
[    1.753123] [<c103e8b8>] (genpd_poweroff_unused) from [<c0301e78>] (do_one_initcall+0x40/0x170)
[    1.761815] [<c0301e78>] (do_one_initcall) from [<c1000dc8>] (kernel_init_freeable+0x15c/0x1fc)
[    1.770507] [<c1000dc8>] (kernel_init_freeable) from [<c0bb7ba0>] (kernel_init+0x8/0x114)
[    1.778678] [<c0bb7ba0>] (kernel_init) from [<c0307df8>] (ret_from_fork+0x14/0x3c)
[    1.786240] ---[ end trace b38c51ace1463add ]---
[    1.790875] genpd_poweroff_unused disabling ������
[    1.795856] genpd_poweroff_unused disabling ������
[    1.800830] ------------[ cut here ]------------
[    1.805443] WARNING: CPU: 0 PID: 1 at ../kernel/workqueue.c:1440 __queue_work+0x2b8/0x3f8
[    1.813610] Modules linked in:
[    1.816673] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W       4.8.0-rc6-next-20160915-00001-g7432710-dirty #5
[    1.827094] Hardware name: Rockchip (Device Tree)
[    1.831795] [<c0310388>] (unwind_backtrace) from [<c030ba04>] (show_stack+0x10/0x14)
[    1.839532] [<c030ba04>] (show_stack) from [<c0599c90>] (dump_stack+0x90/0xa4)
[    1.846747] [<c0599c90>] (dump_stack) from [<c0341bc0>] (__warn+0xe8/0x100)
[    1.853700] [<c0341bc0>] (__warn) from [<c0341c88>] (warn_slowpath_null+0x20/0x28)
[    1.861264] [<c0341c88>] (warn_slowpath_null) from [<c0355b28>] (__queue_work+0x2b8/0x3f8)
[    1.869521] [<c0355b28>] (__queue_work) from [<c0355ca8>] (queue_work_on+0x40/0x4c)
[    1.877170] [<c0355ca8>] (queue_work_on) from [<c103e8b8>] (genpd_poweroff_unused+0x78/0x9c)
[    1.885600] [<c103e8b8>] (genpd_poweroff_unused) from [<c0301e78>] (do_one_initcall+0x40/0x170)
[    1.894290] [<c0301e78>] (do_one_initcall) from [<c1000dc8>] (kernel_init_freeable+0x15c/0x1fc)
[    1.902981] [<c1000dc8>] (kernel_init_freeable) from [<c0bb7ba0>] (kernel_init+0x8/0x114)
[    1.911152] [<c0bb7ba0>] (kernel_init) from [<c0307df8>] (ret_from_fork+0x14/0x3c)
[    1.918713] ---[ end trace b38c51ace1463ade ]---
[    1.923338] genpd_poweroff_unused disabling ������
[    1.928325] genpd_poweroff_unused disabling ������

[+ millions more of those]