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 15DF3431484; Tue, 7 Jul 2026 16:00:49 +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=1783440052; cv=none; b=s7xTACwfb3oSvnUes3cPJxlVS5mZguYZ1TlfWatvanixXthcCsEznk4X5XmN5D72e58ztC996M+ps9PIocfQ1IAPXFH/O9OcycFVM10ks9UNwbptIiHo316LpzFo800Y1S+cxDOZ3tr/OhcWRJoQtlOFFE0e2XNyRWHvALR/fUg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783440052; c=relaxed/simple; bh=ChJRypsr3Dcq8r3UD1/SH4cIoxbNZOBcguf/Rdix3Oo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UfkStqIC6B0EIx+MqEvtHsvXnt5ofUpSl044Jo47Fr0DYAOi9xrTNf0+KauxiB/zpuH55TMzzbA/NuhZKMDtu/+aaLvMYIvvhPxzUJhslgfqRYDS64UaxriJS6aCCpUntL0fkyhiJY6HrxVcsSYviPENmxTTZCFo3YOTApVh1Nk= 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=TBIT2Kmz; 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="TBIT2Kmz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1783440050; x=1814976050; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=ChJRypsr3Dcq8r3UD1/SH4cIoxbNZOBcguf/Rdix3Oo=; b=TBIT2KmzESWNM0oZ5zKnfOcnCwX7PyF5icosspqXv6HvDT7kZN9kn8jK DGCMq37vocr45Mc6ZDyn4y8ASce7l2UQzlPNIwTJvEIURVGyid9dKEDBO XIWVIs/l+zDUg/asqAl32Ew3zLT5rdZXPzYqIVpTqqTWe0NGiKKD5mvk4 LzZUXA6U5N58Gn03mbtsArTWe8D5e88wFqXVd5UkhCBQona/Cfn/bdKV9 Zx0kWANirioZryRIhRhfoUvhbmBeDuC3K131KD7t7SJBB3Cs3WJn6M0gm cUtyrIz8AgFoNfKW7RTsHyJg+QV+TlUjzDpeoKZy8VH4U3c313FhgCj1m w==; X-CSE-ConnectionGUID: La/cKO59RBW1n6//2HGoyg== X-CSE-MsgGUID: ZI+DyjD2TDKH5IS3z7uy6A== X-IronPort-AV: E=McAfee;i="6800,10657,11840"; a="95606865" X-IronPort-AV: E=Sophos;i="6.25,153,1779174000"; d="scan'208";a="95606865" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2026 09:00:49 -0700 X-CSE-ConnectionGUID: 6wMFz189QgOFRSpef6Dblw== X-CSE-MsgGUID: oPwpGielSgeqE+pcYxtbmA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,153,1779174000"; d="scan'208";a="250674850" Received: from slindbla-desk.ger.corp.intel.com (HELO localhost) ([10.245.245.36]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2026 09:00:45 -0700 Date: Tue, 7 Jul 2026 19:00:43 +0300 From: Andy Shevchenko To: rodrigo.alencar@analog.com Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-hardening@vger.kernel.org, Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Philipp Zabel , Jonathan Corbet , Shuah Khan , Kees Cook , "Gustavo A. R. Silva" Subject: Re: [PATCH v7 08/17] iio: core: add hierarchical channel relationships Message-ID: References: <20260707-ad9910-iio-driver-v7-0-a4ec30f63700@analog.com> <20260707-ad9910-iio-driver-v7-8-a4ec30f63700@analog.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260707-ad9910-iio-driver-v7-8-a4ec30f63700@analog.com> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo On Tue, Jul 07, 2026 at 03:04:29PM +0100, Rodrigo Alencar via B4 Relay wrote: > Add parent-child relationship between iio channels by creating a parent > pointer field in iio_chan_spec struct and exposing a sysfs attribute that > returns the parent channel prefix. ... > +static ssize_t iio_read_channel_parent(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + const struct iio_chan_spec *chan = to_iio_dev_attr(attr)->c->parent; > + ssize_t len; > + > + len = __iio_chan_prefix_emit(dev, chan, IIO_SEPARATE, buf, PAGE_SIZE); > + if (len < 0) > + return len; > + > + buf[len] = '\n'; > + > + return len + 1; buf[len++] = '\n'; return len; ? To me this variant is more robust as we don't forget about \n in the len count. > +} -- With Best Regards, Andy Shevchenko