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From: Timur Tabi <timur@codeaurora.org>
To: Stephen Boyd <sboyd@codeaurora.org>
Cc: Linus Walleij <linus.walleij@linaro.org>,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-gpio@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH 3/3] pinctrl: qcom: Don't allow protected pins to be requested
Date: Thu, 25 Jan 2018 15:53:54 -0600	[thread overview]
Message-ID: <b05406cc-21a3-9c1a-b093-a3db2477eee4@codeaurora.org> (raw)
In-Reply-To: <20180125215135.GY28313@codeaurora.org>

On 01/25/2018 03:51 PM, Stephen Boyd wrote:
> Sorry I don't get it. Is that some sort of hardening requirement?
> If the framework doesn't cause those pins to be touched I fail to
> see how it could hurt to have the other addresses listed. I'm
> sure with some effort protected addresses could be crafted in
> other ways to cause an XPU violation to the same place.

It's for my own sanity.  By ensuring that those physical addresses are 
not ever present in the driver or any data structure, I can fend off, 
"Hey Timur, your gpio driver is causing XPU violations again, heh heh".

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.

  reply	other threads:[~2018-01-25 21:53 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-10  1:58 [PATCH 0/3] Support qcom pinctrl protected pins Stephen Boyd
     [not found] ` <20180110015848.11480-1-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-01-10  1:58   ` [PATCH 1/3] gpiolib: Export gpiochip_irqchip_irq_valid() to drivers Stephen Boyd
2018-01-10  6:16     ` Bjorn Andersson
2018-01-10 13:22     ` Linus Walleij
2018-01-10  1:58 ` [PATCH 2/3] dt-bindings: pinctrl: Add a ngpios-ranges property Stephen Boyd
2018-01-10 12:54   ` Andy Shevchenko
     [not found]   ` <20180110015848.11480-3-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-01-10 13:37     ` Linus Walleij
2018-01-10 16:37       ` Stephen Boyd
2018-01-10 17:59         ` Andy Shevchenko
2018-01-11 16:33       ` Grant Likely
2018-01-11 16:36         ` Timur Tabi
2018-01-11 19:56           ` Grant Likely
2018-01-10  1:58 ` [PATCH 3/3] pinctrl: qcom: Don't allow protected pins to be requested Stephen Boyd
2018-01-10  6:11   ` Bjorn Andersson
2018-01-22 13:55   ` Timur Tabi
2018-01-22 20:03     ` Timur Tabi
2018-01-25 21:51     ` Stephen Boyd
2018-01-25 21:53       ` Timur Tabi [this message]
2018-01-25 20:48   ` Timur Tabi

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