linux-kernel - Re: [PATCH] TESTCASE: of: OOPS when disabling node via OF

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Date:	Thu, 11 Jun 2015 14:14:41 +0300
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Wolfram Sang <wsa@...-dreams.de>, devicetree@...r.kernel.org,
	linux-sh@...r.kernel.org, Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] TESTCASE: of: OOPS when disabling node via OF_DYNAMIC

Hi Grant,

> On Jun 7, 2015, at 14:16 , Grant Likely <grant.likely@...retlab.ca> wrote:
> 
> On Wed, 22 Apr 2015 15:30:28 +0300
> , Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> wrote:
>> Hi Wolfram,
>> 
>>> On Apr 14, 2015, at 16:27 , Wolfram Sang <wsa@...-dreams.de> wrote:
>>> 
>>> Hi Pantelis,
>>> 
>>> thanks for your prompt reply. Unfortunately, I had to wait until I could
>>> access the test system again.
>>> 
>> 
>> [snip]
>> 
>> Sorry for the non-prompt reply; but just for kicks, can you try the attached patch?
>> 
>> I have a hunch this might be the problem.
>> 
>> Regards
>> 
>> — Pantelis
>> 
>> 
> 
> I played around with this some today. If I'm reading it correctly, the
> following patch reproduces the same problem:
> 
> (continued below patch)
> ---
> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> index 18016341d5a9..0a27b38c3041 100644
> --- a/drivers/of/unittest.c
> +++ b/drivers/of/unittest.c
> @@ -753,6 +753,11 @@ static void __init of_unittest_match_node(void)
> 	}
> }
> 
> +static struct resource test_bus_res = {
> +	.start = 0xfffffff8,
> +	.end = 0xfffffff9,
> +	.flags = IORESOURCE_MEM,
> +};
> static const struct platform_device_info test_bus_info = {
> 	.name = "unittest-bus",
> };
> @@ -795,6 +800,7 @@ static void __init of_unittest_platform_populate(void)
> 	if (rc)
> 		return;
> 	test_bus->dev.of_node = np;
> +	platform_device_add_resources(test_bus, &test_bus_res, 1);
> 
> 	of_platform_populate(np, match, NULL, &test_bus->dev);
> 	for_each_child_of_node(np, child) {
> 
> ---
> 
> I think the fixup patch boils down to the following. It's hard to tell
> because it combines refactoring with the bug fix. Do I have it correct?
> If so, I'd rather commit the simple fix which can be committed now for
> v4.1, and the refactoring can be pushed for v4.2
> 
> ---
> 
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index ebf034b97278..b3042e6ee3ef 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -377,7 +377,7 @@ int platform_device_add(struct platform_device *pdev)
> 		struct resource *r = &pdev->resource[i];
> 		unsigned long type = resource_type(r);
> 
> -		if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
> +		if (r->parent)
> 			release_resource(r);
> 	}
> 
> @@ -410,7 +410,7 @@ void platform_device_del(struct platform_device *pdev)
> 			struct resource *r = &pdev->resource[i];
> 			unsigned long type = resource_type(r);
> 
> -			if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
> +			if (r->parent)
> 				release_resource(r);
> 		}
> 	}
> 

Verified. No crashes.

Acked-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>

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