From patchwork Thu Oct 3 17:34:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Martelli X-Patchwork-Id: 833192 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6752E1ABEA1; Thu, 3 Oct 2024 17:34:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727976892; cv=none; b=GkOck/g2/klAJzmrpt+ofJZ8TUYaVe//elGnFKt9d3MXvmEFBWq1T92epGOuKFl+z083or5+RqCMOmx9oRAHRTZMnU0oUs1KWHWO1ma8ys3NgFH8fNVWqzkpAaMDgXbobVCm2iY0q7zd5hrSnMHbVptsPQmEfqzYb0Se8va6H88= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727976892; c=relaxed/simple; bh=JI696ir0QITrxWEfRcF3ZHdp8+XMqxpwlGo9q4ElXuU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=gjgYTHJ4XB2DJgNuVHF879Z5J/WN9VxGYfjPDW0rmynRm6xwFKwsnw7X1Y6xN/4OmYWCfJ/i/l6ixft48uv7viU67N4SWrMcCI9GGRH0Ryf4zQNuoK2qCm03W7CPW5Av/aCSrV+Z3Lmd8MfY+f7VMu+A5zubDuY0CPb+CJiBF0M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=MpmGUrx0; arc=none smtp.client-ip=209.85.128.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MpmGUrx0" Received: by mail-wm1-f45.google.com with SMTP id 5b1f17b1804b1-42cb806623eso10208715e9.2; Thu, 03 Oct 2024 10:34:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1727976889; x=1728581689; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=lQLemq3ZBEgFeRrStV/dpS5btl0G+M2whUJOsHCfVSQ=; b=MpmGUrx0m//kfyQbrdm9l+dary9yMIzKIq629v47umAV+4EI9i0Z5+uGKx58yv9s05 yIni+55i5gambxiam/BEeReWew0SdeTQ6ydZQHS8/TaZLcT34vEnj+ZAel2osSqHXMi1 Vwm2y+MzzxqvCNuPwxL3jC32Q2Tqax0Jl526croxnygUZssb1tMMWYrg/z6QSmvMAzEw 45TSDhyem7+G2pSYY4qaxQIIJOBf4Zci56kZB1CCRiGOswuk3HO3pcI07EdRIUz7k5yd qpitKXJkNFylXIbXGAFHUael/nsl3EBbCulmx7d2uqRBbCIi5DZSNlifuhQO+S8hsmHC qnLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727976889; x=1728581689; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=lQLemq3ZBEgFeRrStV/dpS5btl0G+M2whUJOsHCfVSQ=; b=H8RSdpewlkRshwNluWImK5OiSf0FF8ZzKc/Jtl3f8Oq8lkzfJNsp96srWiXT079h3E YsWAhQW+DjyrPDEKxyoOjmByTPta5WDE9FfacNSyP+chSwoPfauyWIea60fg7yEMw3HL kVkF1giAfLAgRwntzYfxQ6oJ4czEiiYNVRVrbsb8mqt4JtR66lqR2QavrJsGtigqmxiH mqhyyyxQDxRVmACSrSi2z1r4URIzYyv9BOmpEypjHTS0RlnM8NXKvcUTgJeVbHW/GYzh X8NRNmBYfr6Eiz3zmdjwmY6s4wvox62e0Uqd4Mj0NFLD2n6NI/cew3tPLnOOM/Epd3++ Zh7A== X-Forwarded-Encrypted: i=1; AJvYcCVsinTDeIHvtuKDe2iHagBtOV43IiF559xWbviSsMqzzp/YNjwFz2FWAl1EN8OXOBpskbVs4+SOp4G7744=@vger.kernel.org, AJvYcCW946HTkbmD2EGxakMnqEsKVPkkRxOCXptnNE789fp+Y4o40FvAfh/zcHoDqoBA6D5hhp8NENyAQMs=@vger.kernel.org, AJvYcCWTlhGfijAx8/gfvIL5BPOkwZ0M4cCcSuTzRS7HCztFXjaY9gYwJB/GM+FermvLzdU8oiq20xZqnUvhLw==@vger.kernel.org X-Gm-Message-State: AOJu0Yy8jMmVAk/n4tB5uFpTm2w1F/Vg8gAP4KuPIrkRLFFEj3076uId 2T3vNzMH+YbKumSX/InXVy98vIXTs3LVse75OD+MkO0PbGxx12Xr X-Google-Smtp-Source: AGHT+IGAma1RySn1IK/rp0LtN48vO0lX02UU0J0RCmsTD86qOQ0N6ZY4suhHS5IMu/uczXymL5Wx4g== X-Received: by 2002:a5d:6506:0:b0:371:8c61:577c with SMTP id ffacd0b85a97d-37d0e7373dfmr115647f8f.26.1727976888631; Thu, 03 Oct 2024 10:34:48 -0700 (PDT) Received: from localhost (host-79-19-52-27.retail.telecomitalia.it. [79.19.52.27]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d082e6de8sm1713425f8f.114.2024.10.03.10.34.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Oct 2024 10:34:47 -0700 (PDT) From: Matteo Martelli Date: Thu, 03 Oct 2024 19:34:10 +0200 Subject: [PATCH 5/7] iio: inkern: copy/release available info from producer Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241003-iio-read-avail-release-v1-5-c70cc7d9c2e0@gmail.com> References: <20241003-iio-read-avail-release-v1-0-c70cc7d9c2e0@gmail.com> In-Reply-To: <20241003-iio-read-avail-release-v1-0-c70cc7d9c2e0@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Alisa-Dariana Roman , Christian Eggers , Peter Rosin , Paul Cercueil , Sebastian Reichel Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pm@vger.kernel.org, Matteo Martelli X-Mailer: b4 0.14.2 Consumers need to call the read_avail_release_resource after reading the available info. To call the release with info_exists locked, copy the available info from the producer and immediately call its release callback. With this change, users of iio_read_avail_channel_raw() and iio_read_avail_channel_attribute() must free the copied avail info after calling them. Signed-off-by: Matteo Martelli --- drivers/iio/inkern.c | 64 +++++++++++++++++++++++++++++++++----------- include/linux/iio/consumer.h | 4 +-- 2 files changed, 50 insertions(+), 18 deletions(-) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 7f325b3ed08fae6674245312cf8f57bb151006c0..cc65ef79451e5aa2cea447e168007a447ffc0d91 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -760,9 +760,25 @@ static int iio_channel_read_avail(struct iio_channel *chan, if (!iio_channel_has_available(chan->channel, info)) return -EINVAL; - if (iio_info->read_avail) - return iio_info->read_avail(chan->indio_dev, chan->channel, - vals, type, length, info); + if (iio_info->read_avail) { + const int *vals_tmp; + int ret; + + ret = iio_info->read_avail(chan->indio_dev, chan->channel, + &vals_tmp, type, length, info); + if (ret < 0) + return ret; + + *vals = kmemdup_array(vals_tmp, *length, sizeof(int), GFP_KERNEL); + if (!*vals) + return -ENOMEM; + + if (iio_info->read_avail_release_resource) + iio_info->read_avail_release_resource( + chan->indio_dev, chan->channel, vals_tmp, info); + + return ret; + } return -EINVAL; } @@ -789,9 +805,11 @@ int iio_read_avail_channel_raw(struct iio_channel *chan, ret = iio_read_avail_channel_attribute(chan, vals, &type, length, IIO_CHAN_INFO_RAW); - if (ret >= 0 && type != IIO_VAL_INT) + if (ret >= 0 && type != IIO_VAL_INT) { /* raw values are assumed to be IIO_VAL_INT */ + kfree(*vals); ret = -EINVAL; + } return ret; } @@ -820,24 +838,31 @@ static int iio_channel_read_max(struct iio_channel *chan, if (val2) *val2 = vals[5]; } - return 0; + ret = 0; + break; case IIO_AVAIL_LIST: - if (length <= 0) - return -EINVAL; + if (length <= 0) { + ret = -EINVAL; + goto out; + } switch (*type) { case IIO_VAL_INT: *val = max_array(vals, length); + ret = 0; break; default: /* TODO: learn about max for other iio values */ - return -EINVAL; + ret = -EINVAL; } - return 0; + break; default: - return -EINVAL; + ret = -EINVAL; } +out: + kfree(vals); + return ret; } int iio_read_max_channel_raw(struct iio_channel *chan, int *val) @@ -876,24 +901,31 @@ static int iio_channel_read_min(struct iio_channel *chan, if (val2) *val2 = vals[1]; } - return 0; + ret = 0; + break; case IIO_AVAIL_LIST: - if (length <= 0) - return -EINVAL; + if (length <= 0) { + ret = -EINVAL; + goto out; + } switch (*type) { case IIO_VAL_INT: *val = min_array(vals, length); + ret = 0; break; default: /* TODO: learn about min for other iio values */ - return -EINVAL; + ret = -EINVAL; } - return 0; + break; default: - return -EINVAL; + ret = -EINVAL; } +out: + kfree(vals); + return ret; } int iio_read_min_channel_raw(struct iio_channel *chan, int *val) diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 333d1d8ccb37f387fe531577ac5e0bfc7f752cec..e3e268d2574b3e01c9412449d90d627de7efcd84 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -316,7 +316,7 @@ int iio_read_min_channel_raw(struct iio_channel *chan, int *val); /** * iio_read_avail_channel_raw() - read available raw values from a given channel * @chan: The channel being queried. - * @vals: Available values read back. + * @vals: Available values read back. Must be freed after use. * @length: Number of entries in vals. * * Returns an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST. @@ -334,7 +334,7 @@ int iio_read_avail_channel_raw(struct iio_channel *chan, /** * iio_read_avail_channel_attribute() - read available channel attribute values * @chan: The channel being queried. - * @vals: Available values read back. + * @vals: Available values read back. Must be freed after use. * @type: Type of values read back. * @length: Number of entries in vals. * @attribute: info attribute to be read back.