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Subject: Re: [PATCH 1/2] bus: ti-sysc: Fix wakeirq sleeping function called
 from invalid context
To:     Tony Lindgren <tony@atomide.com>, <linux-omap@vger.kernel.org>
CC:     "Andrew F . Davis" <afd@ti.com>, Dave Gerlach <d-gerlach@ti.com>,
        Faiz Abbas <faiz_abbas@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Keerthy <j-keerthy@ti.com>, Nishanth Menon <nm@ti.com>,
        Peter Ujfalusi <peter.ujfalusi@ti.com>,
        Roger Quadros <rogerq@ti.com>, Tero Kristo <t-kristo@ti.com>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>
References: <20200702174929.26506-1-tony@atomide.com>
From:   Suman Anna <s-anna@ti.com>
Message-ID: <434eff2e-bc7f-84ee-0980-769915cefffb@ti.com>
Date:   Thu, 2 Jul 2020 13:00:25 -0500
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Hi Tony,

On 7/2/20 12:49 PM, Tony Lindgren wrote:
> With CONFIG_DEBUG_ATOMIC_SLEEP enabled we can see the following with
> wakeirqs and serial console idled:

Which devices are these? I have one patch from Tero fixing similar 
errors in OMAP IOMMU driver. Will post that either today or tomorrow.

regards
Suman

> 
> BUG: sleeping function called from invalid context at drivers/bus/ti-sysc.c:242
> ...
> (sysc_wait_softreset) from [<c0606894>] (sysc_enable_module+0x48/0x274)
> (sysc_enable_module) from [<c0606c5c>] (sysc_runtime_resume+0x19c/0x1d8)
> (sysc_runtime_resume) from [<c0606cf0>] (sysc_child_runtime_resume+0x58/0x84)
> (sysc_child_runtime_resume) from [<c06eb7bc>] (__rpm_callback+0x30/0x12c)
> (__rpm_callback) from [<c06eb8d8>] (rpm_callback+0x20/0x80)
> (rpm_callback) from [<c06eb434>] (rpm_resume+0x638/0x7fc)
> (rpm_resume) from [<c06eb658>] (__pm_runtime_resume+0x60/0x9c)
> (__pm_runtime_resume) from [<c06edc08>] (handle_threaded_wake_irq+0x24/0x60)
> (handle_threaded_wake_irq) from [<c01befec>] (irq_thread_fn+0x1c/0x78)
> (irq_thread_fn) from [<c01bf30c>] (irq_thread+0x140/0x26c)
> 
> We have __pm_runtime_resume() call the sysc_runtime_resume() with spinlock
> held and interrupts disabled.
> 
> Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit")
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> ---
>   drivers/bus/ti-sysc.c | 13 ++++++-------
>   1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -236,15 +236,14 @@ static int sysc_wait_softreset(struct sysc *ddata)
>   		syss_done = ddata->cfg.syss_mask;
>   
>   	if (syss_offset >= 0) {
> -		error = readx_poll_timeout(sysc_read_sysstatus, ddata, rstval,
> -					   (rstval & ddata->cfg.syss_mask) ==
> -					   syss_done,
> -					   100, MAX_MODULE_SOFTRESET_WAIT);
> +		error = readx_poll_timeout_atomic(sysc_read_sysstatus, ddata,
> +				rstval, (rstval & ddata->cfg.syss_mask) ==
> +				syss_done, 100, MAX_MODULE_SOFTRESET_WAIT);
>   
>   	} else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) {
> -		error = readx_poll_timeout(sysc_read_sysconfig, ddata, rstval,
> -					   !(rstval & sysc_mask),
> -					   100, MAX_MODULE_SOFTRESET_WAIT);
> +		error = readx_poll_timeout_atomic(sysc_read_sysconfig, ddata,
> +				rstval, !(rstval & sysc_mask),
> +				100, MAX_MODULE_SOFTRESET_WAIT);
>   	}
>   
>   	return error;
>