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[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-iio@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.