linux-kernel - Re: OF: ERROR: Bad of_node_put() on /ocp/interconnect@...00000/segment@...arget-module@...0/cm

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Date:   Fri, 24 Apr 2020 08:38:06 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Tero Kristo <t-kristo@...com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-omap@...r.kernel.org, lkft-triage@...ts.linaro.org,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Benoit Cousson <bcousson@...libre.com>,
        Carlos Hernandez <ceh@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Olof Johansson <olof@...om.net>, tomi.valkeinen@...com,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: OF: ERROR: Bad of_node_put() on
 /ocp/interconnect@...00000/segment@...arget-module@...0/cm_core@...4per-cm@...0/l4per-clkctrl@28

* Tero Kristo <t-kristo@...com> [200424 12:41]:
> On 17/04/2020 18:29, Tony Lindgren wrote:
> > * Naresh Kamboju <naresh.kamboju@...aro.org> [200327 16:44]:
> > > The reported problem still happening on arm beagle board x15 device
> > > running Linux next kernel 20200327.
> > ...
> > 
> > > [    0.000000] OF: ERROR: Bad of_node_put() on
> > > /ocp/interconnect@...00000/segment@...arget-module@...0/cm_core@...4per-cm@...0/l4per-clkctrl@28
> > > [    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W
> > >    5.6.0-rc7-next-20200327 #1
> > > [    0.000000] Hardware name: Generic DRA74X (Flattened Device Tree)
> > > [    0.000000] [<c0311810>] (unwind_backtrace) from [<c030ba14>]
> > > (show_stack+0x10/0x14)
> > > [    0.000000] [<c030ba14>] (show_stack) from [<c0fb6604>]
> > > (dump_stack+0xbc/0xd0)
> > > [    0.000000] [<c0fb6604>] (dump_stack) from [<c0fbb07c>]
> > > (kobject_put+0xc0/0x104)
> > > [    0.000000] [<c0fbb07c>] (kobject_put) from [<c1639e4c>]
> > > (of_clk_init+0x18c/0x228)
> > > [    0.000000] [<c1639e4c>] (of_clk_init) from [<c1611544>]
> > > (omap_clk_init+0x3c/0x58)
> > > [    0.000000] [<c1611544>] (omap_clk_init) from [<c1611ea8>]
> > > (omap4_sync32k_timer_init+0x8/0x2c)
> > > [    0.000000] [<c1611ea8>] (omap4_sync32k_timer_init) from
> > > [<c161213c>] (omap5_realtime_timer_init+0x8/0x234)
> > > [    0.000000] [<c161213c>] (omap5_realtime_timer_init) from
> > > [<c1600c88>] (start_kernel+0x330/0x4b8)
> > 
> > Just FYI, Tero is looking at the clock issues that seem to be
> > causing these warnings.
> 
> Haven't seen this before, but easily reproducible with multi_v7_defconfig. I
> have a simple fix for it now, will post to lists soon.

OK thanks for tracking it down.

Tony