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

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Date:	Sun, 07 Jun 2015 12:16:32 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Wolfram Sang <wsa@...-dreams.de>
Cc:	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

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);
 		}
 	}

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