linux-kernel - Re: [PATCH V2] spmi: pmic-arb: Enforce the ownership check optionally

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Message-ID: <20170822085541.GB3685@dragon>
Date:   Tue, 22 Aug 2017 16:55:43 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Kiran Gunda <kgunda@...eaurora.org>, gregkh@...uxfoundation.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V2] spmi: pmic-arb: Enforce the ownership check optionally

On Mon, Aug 21, 2017 at 04:18:58PM -0700, Stephen Boyd wrote:
> On 08/18/2017 08:28 AM, Kiran Gunda wrote:
> > The peripheral ownership check is not necessary on single master
> > platforms. Hence, enforce the peripheral ownership check optionally.
> >
> > Signed-off-by: Kiran Gunda <kgunda@...eaurora.org>
> > Tested-by: Shawn Guo <shawnguo@...nel.org>
> > ---
> 
> This sounds like a band-aid. Isn't the gpio driver going to keep probing
> all the pins that are not supposed to be accessed due to security
> constraints? What exactly is failing in the gpio case?

There is a platform_irq_count() call in pinctrl-spmi-gpio probe
function.  Due to the owner check in spmi-pmic-arb IRQ domain
qpnpint_irq_domain_dt_translate() function, the call will return irq
number as zero and cause pmic_gpio_probe() fail with -EINVAL error.

[    1.608516] [<ffff00000860e51c>] qpnpint_irq_domain_dt_translate+0x168/0x194
[    1.613557] [<ffff000008117040>] irq_create_fwspec_mapping+0x17c/0x2d8
[    1.620672] [<ffff000008117200>] irq_create_of_mapping+0x64/0x74
[    1.627008] [<ffff0000087b4fac>] of_irq_get+0x54/0x64
[    1.633169] [<ffff00000856b824>] platform_get_irq+0x20/0x150
[    1.638117] [<ffff00000856b97c>] platform_irq_count+0x28/0x44
[    1.643850] [<ffff0000083cf12c>] pmic_gpio_probe+0x50/0x544

Shawn