From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
To: Laurent Pinchart
<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
Cc: Pantelis Antoniou
<pantelis.antoniou-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>,
Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Magnus Damm <magnus.damm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Simon Horman <horms-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>,
Geert Uytterhoeven
<geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] TESTCASE: of: OOPS when disabling node via OF_DYNAMIC
Date: Wed, 10 Jun 2015 17:53:22 +0100 [thread overview]
Message-ID: <20150610165322.576FDC408EA@trevor.secretlab.ca> (raw)
In-Reply-To: <2309597.bA1dyPGh92@avalon>
On Tue, 09 Jun 2015 19:50:26 +0300
, Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
wrote:
> Hi Grant,
>
> On Sunday 07 June 2015 12:16:32 Grant Likely wrote:
> > On Wed, 22 Apr 2015 15:30:28 +0300, Pantelis Antoniou wrote:
> > > > On Apr 14, 2015, at 16:27 , Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org> 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
> > >
> > > â 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
>
> The patch below looks equivalent to Pantelis' patch if we remove the
> refactoring, but I don't immediately see how r->parent can be NULL in
> platform_device_del() if type is equal to IORESOURCE_MEM or IORESOURCE_IO, as
> platform_device_add() will have called insert_resource() in those cases, which
> should set the resource parent pointer. I must be missing something as the
> patch fixes Wolfram's issue, so an explanation in the commit message would be
> welcome.
of_platform_populate() adds platform devices via of_device_add().
of_device_add() doesn't add the resources because there are platforms
that break due to nodes with overlapping resources.
g.
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next prev parent reply other threads:[~2015-06-10 16:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-31 15:12 [PATCH] TESTCASE: of: OOPS when disabling node via OF_DYNAMIC Wolfram Sang
2015-03-31 16:23 ` Pantelis Antoniou
2015-04-14 13:27 ` Wolfram Sang
2015-04-22 12:30 ` Pantelis Antoniou
2015-04-23 8:33 ` Wolfram Sang
2015-04-23 8:41 ` Pantelis Antoniou
2015-04-23 8:49 ` Wolfram Sang
[not found] ` <83B5C458-8D49-4EF6-9F4A-6C0E2579AB9F-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>
2015-06-07 11:16 ` Grant Likely
2015-06-09 16:50 ` Laurent Pinchart
2015-06-10 16:53 ` Grant Likely [this message]
2015-06-11 11:14 ` Pantelis Antoniou
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