"io-channel-names" is expected to have few values, so there is no real point to allocate audio_iio_aux_chan structure with a dedicate memory allocation.
Using a flexible array for struct audio_iio_aux->chans avoids the overhead of an additional, managed, memory allocation.
This also saves an indirection when the array is accessed.
Finally, __counted_by() can be used for run-time bounds checking if configured and supported by the compiler.
Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr --- sound/soc/codecs/audio-iio-aux.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-)
diff --git a/sound/soc/codecs/audio-iio-aux.c b/sound/soc/codecs/audio-iio-aux.c index a8bf14239bd7..1e8e1effc2af 100644 --- a/sound/soc/codecs/audio-iio-aux.c +++ b/sound/soc/codecs/audio-iio-aux.c @@ -26,8 +26,8 @@ struct audio_iio_aux_chan {
struct audio_iio_aux { struct device *dev; - struct audio_iio_aux_chan *chans; unsigned int num_chans; + struct audio_iio_aux_chan chans[] __counted_by(num_chans); };
static int audio_iio_aux_info_volsw(struct snd_kcontrol *kcontrol, @@ -250,23 +250,18 @@ static int audio_iio_aux_probe(struct platform_device *pdev) int ret; int i;
- iio_aux = devm_kzalloc(dev, sizeof(*iio_aux), GFP_KERNEL); + count = device_property_string_array_count(dev, "io-channel-names"); + if (count < 0) + return dev_err_probe(dev, count, "failed to count io-channel-names\n"); + + iio_aux = devm_kzalloc(dev, struct_size(iio_aux, chans, count), GFP_KERNEL); if (!iio_aux) return -ENOMEM;
iio_aux->dev = dev;
- count = device_property_string_array_count(dev, "io-channel-names"); - if (count < 0) - return dev_err_probe(dev, count, "failed to count io-channel-names\n"); - iio_aux->num_chans = count;
- iio_aux->chans = devm_kmalloc_array(dev, iio_aux->num_chans, - sizeof(*iio_aux->chans), GFP_KERNEL); - if (!iio_aux->chans) - return -ENOMEM; - names = kcalloc(iio_aux->num_chans, sizeof(*names), GFP_KERNEL); if (!names) return -ENOMEM;