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SubjectRe: [RFC PATCH 04/12] iio: buffer: add index to the first IIO buffer dir and symlink it back
On Tue, 17 Nov 2020 18:23:32 +0200
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> This change makes it so that the first buffer directory is named 'buffer0'
> and moves the 'scan_elements' under it.
>
> For backwards compatibility these folders are symlinked back to the
> original folders.
Well done on your patch breakdown here. Makes the actual switch nice
and simple in this patch.

Looks good to me.

Thanks,

Jonathan

>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
> drivers/iio/industrialio-buffer.c | 38 +++++++++++++++++++++++++++----
> 1 file changed, 33 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index 8b31faf049a5..62c8bd6b67cd 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -1346,7 +1346,8 @@ static void iio_sysfs_del_attrs(struct kobject *kobj, struct attribute **ptr)
> }
>
> static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
> - struct iio_dev *indio_dev)
> + struct iio_dev *indio_dev,
> + unsigned int idx)
> {
> struct iio_dev_attr *p;
> struct attribute **attr;
> @@ -1378,7 +1379,7 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
> buffer->buffer_attrs = attr;
>
> ret = kobject_init_and_add(&buffer->buffer_dir, &iio_buffer_dir_ktype,
> - &indio_dev->dev.kobj, "buffer");
> + &indio_dev->dev.kobj, "buffer%u", idx);
> if (ret)
> goto error_buffer_free_attrs;
>
> @@ -1423,7 +1424,7 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
> }
>
> ret = kobject_init_and_add(&buffer->scan_el_dir, &iio_scan_el_dir_ktype,
> - &indio_dev->dev.kobj, "scan_elements");
> + &buffer->buffer_dir, "scan_elements");
> if (ret)
> goto error_free_scan_attrs;
>
> @@ -1454,11 +1455,13 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
> return ret;
> }
>
> +static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer);
> +
> int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> {
> struct iio_buffer *buffer = indio_dev->buffer;
> const struct iio_chan_spec *channels;
> - int i;
> + int i, ret;
>
> channels = indio_dev->channels;
> if (channels) {
> @@ -1472,7 +1475,29 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> if (!buffer)
> return 0;
>
> - return __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev);
> + ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, 0);
> + if (ret)
> + return ret;
> +
> + ret = sysfs_create_link(&indio_dev->dev.kobj,
> + &indio_dev->buffer->buffer_dir,
> + "buffer");
> + if (ret)
> + goto error_free_sysfs_and_mask;
> +
> + ret = sysfs_create_link(&indio_dev->dev.kobj,
> + &indio_dev->buffer->scan_el_dir,
> + "scan_elements");
> + if (ret)
> + goto error_remove_buffer_dir_link;
> +
> + return 0;
> +
> +error_remove_buffer_dir_link:
> + sysfs_remove_link(&indio_dev->dev.kobj, "buffer");
> +error_free_sysfs_and_mask:
> + __iio_buffer_free_sysfs_and_mask(buffer);
> + return ret;
> }
>
> static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
> @@ -1494,6 +1519,9 @@ void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
> if (!buffer)
> return;
>
> + sysfs_remove_link(&indio_dev->dev.kobj, "scan_elements");
> + sysfs_remove_link(&indio_dev->dev.kobj, "buffer");
> +
> __iio_buffer_free_sysfs_and_mask(buffer);
> }
>

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