From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3CDBB2E1742 for ; Wed, 3 Sep 2025 10:38:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756895925; cv=none; b=kT8Kj4j0iVJf2C43Sp5iDwdPsTDLSdXl5mJH25KbfZgcyi4fQt7/zy7BNxYJ8kKZi82+7uznt96e31DVCjVpqAaSiLWG4NYssPfqOdLvw7MQzK8mCNcz32lloC8y8gJi1uNekllnVftjNgR3oxv/hLhhSNXk8QOt3nvBNfIOCfs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756895925; c=relaxed/simple; bh=GCTF1UYtOSCeRAlhubdQAJ7qhlBqyZpfpnhA1MMIZJE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=aaoY5na9iFzoHZdcee8m4+gcXKSxfw7blnozHd5xOdMOup+l2xG0jYqX6AGiVzRmYu5Ec016KxU2PnKakMVo7C2RVi1U/LzHOWogqFAAECDdW7YSgkqY0OfuAkKrIoo6GE8XDLbIhDZEqNDAqq2/ZgyMMSVUUma414L0QUupmpk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=aoIeSVfg; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="aoIeSVfg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1756895924; x=1788431924; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=GCTF1UYtOSCeRAlhubdQAJ7qhlBqyZpfpnhA1MMIZJE=; b=aoIeSVfgjxBHaBK/rH7eeDtjQn6Q93RiB9ABmLVlCPmjCKXUIIPqN/nV KM0cssTP95HMkBWKzLY0/l3d8NRTnpcK4PWYron/+JrhboKVkBl4U3S13 Bh5pybcx0vaY35wVOE8ZSR9zcTmuu0lWla6FXzgj2yW3A871RzNYklG+s H6Wx/gRMJ2u06zDiAGYIDycA0GJ4+I49tlpOw8m68CWbTRw1S4FJDiAl1 WR4uza9hQ6vvJnArbqe30TMsnQqJIvR1ViQWKsDWHtb2oW+AsD9Qwz3C+ F8G8jGU51Sa5bgwGByzQnnOOdHZt4KSMXnrBor9D/06I8fGrJSaACIqMA w==; X-CSE-ConnectionGUID: FJzHd9koS76uo/J+Zv0ltA== X-CSE-MsgGUID: K9GYnJmMSvGHDL0HydzcAQ== X-IronPort-AV: E=McAfee;i="6800,10657,11541"; a="70632587" X-IronPort-AV: E=Sophos;i="6.18,233,1751266800"; d="scan'208";a="70632587" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2025 03:38:43 -0700 X-CSE-ConnectionGUID: gcUgIZtvSDO2dFM95UNdfw== X-CSE-MsgGUID: hQkiLlfsRpSs+9G/ykDw9A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,233,1751266800"; d="scan'208";a="202430131" Received: from smile.fi.intel.com ([10.237.72.52]) by orviesa002.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2025 03:38:33 -0700 Received: from andy by smile.fi.intel.com with local (Exim 4.98.2) (envelope-from ) id 1utksl-0000000AxU5-0dpr; Wed, 03 Sep 2025 13:38:27 +0300 Date: Wed, 3 Sep 2025 13:38:26 +0300 From: Andy Shevchenko To: Bartosz Golaszewski Cc: Andy Shevchenko , Linus Walleij , Bjorn Andersson , Konrad Dybcio , Alexey Klimov , Lorenzo Bianconi , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Paul Cercueil , Kees Cook , Andy Shevchenko , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Dong Aisheng , Fabio Estevam , Shawn Guo , Jacky Bai , Pengutronix Kernel Team , NXP S32 Linux Team , Sascha Hauer , Tony Lindgren , Haojian Zhuang , Geert Uytterhoeven , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Neil Armstrong , Mark Brown , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, imx@lists.linux.dev, linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Bartosz Golaszewski , Konrad Dybcio Subject: Re: [PATCH v7 16/16] pinctrl: qcom: make the pinmuxing strict Message-ID: References: <20250902-pinctrl-gpio-pinfuncs-v7-0-bb091daedc52@linaro.org> <20250902-pinctrl-gpio-pinfuncs-v7-16-bb091daedc52@linaro.org> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo On Wed, Sep 03, 2025 at 12:34:00PM +0200, Bartosz Golaszewski wrote: > On Wed, Sep 3, 2025 at 12:22 PM Andy Shevchenko > wrote: > > On Wed, Sep 03, 2025 at 09:33:34AM +0200, Bartosz Golaszewski wrote: > > > On Tue, Sep 2, 2025 at 10:46 PM Andy Shevchenko > > > wrote: > > > > On Tue, Sep 2, 2025 at 8:42 PM Bartosz Golaszewski wrote: > > > > > On Tue, Sep 2, 2025 at 4:38 PM Andy Shevchenko > > > > > wrote: > > > > > > On Tue, Sep 02, 2025 at 01:59:25PM +0200, Bartosz Golaszewski wrote: ... > > > > > > > The strict flag in struct pinmux_ops disallows the usage of the same pin > > > > > > > as a GPIO and for another function. Without it, a rouge user-space > > > > > > > process with enough privileges (or even a buggy driver) can request a > > > > > > > used pin as GPIO and drive it, potentially confusing devices or even > > > > > > > crashing the system. Set it globally for all pinctrl-msm users. > > > > > > > > > > > > How does this keep (or allow) I²C generic recovery mechanism to work? > > > > > > Anyway, what is your point? I don't think it has any impact on this. > > > > If we have a group of pins that are marked as I²C, and we want to use recovery > > via GPIOs, would it be still possible to request as GPIO when controller driver > > is in the strict mode? > > Yes, if you mark that function as a "GPIO" function in the pin > controller driver. How would it prevent from requesting from user space? -- With Best Regards, Andy Shevchenko