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Date: Mon, 13 Apr 2020 17:00:24 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<lars@...afoo.de>
Subject: Re: [PATCH v3 4/5] iio: buffer: move sysfs alloc/free in
industrialio-buffer.c
On Fri, 10 Apr 2020 17:17:28 +0300
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:
> Since we now have the 'iio_device_buffers_{un}init()' entry-points into the
> industrialio-buffer.c we can now move the sysfs alloc & free in there as
> part of that init/uninit.
>
> This changes the order of iio_device_register()/iio_device_unregister() a
> bit, but overall this shouldn't matter.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Seems fine at first glance.
Thanks,
Jonathan
> ---
> drivers/iio/iio_core.h | 10 ----------
> drivers/iio/industrialio-buffer.c | 29 +++++++++++++++--------------
> drivers/iio/industrialio-core.c | 14 +-------------
> 3 files changed, 16 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
> index 4bdadeac2710..1d69071e1426 100644
> --- a/drivers/iio/iio_core.h
> +++ b/drivers/iio/iio_core.h
> @@ -48,9 +48,6 @@ void iio_device_buffers_uninit(struct iio_dev *indio_dev);
>
> void iio_device_buffers_put(struct iio_dev *indio_dev);
>
> -int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
> -void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
> -
> void iio_disable_all_buffers(struct iio_dev *indio_dev);
> void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
>
> @@ -66,13 +63,6 @@ static inline void iio_device_buffers_uninit(struct iio_dev *indio_dev) {}
>
> static inline void iio_device_buffers_put(struct iio_dev *indio_dev) {}
>
> -static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> -{
> - return 0;
> -}
> -
> -static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
> -
> static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
> static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
>
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index 4b5c3baadaab..8ab089a9c3bc 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -1284,11 +1284,11 @@ static struct attribute *iio_buffer_attrs[] = {
> &dev_attr_data_available.attr,
> };
>
> -int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> +static int iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer)
> {
> + struct iio_dev *indio_dev = buffer->indio_dev;
> struct iio_dev_attr *p;
> struct attribute **attr;
> - struct iio_buffer *buffer = indio_dev->buffer;
> int ret, i, attrn, attrcount, attrcount_orig = 0;
> const struct iio_chan_spec *channels;
>
> @@ -1301,9 +1301,6 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> indio_dev->masklength = ml;
> }
>
> - if (!buffer)
> - return 0;
> -
> attrcount = 0;
> if (buffer->attrs) {
> while (buffer->attrs[attrcount] != NULL)
> @@ -1395,15 +1392,12 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> return ret;
> }
>
> -void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
> +static void iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
> {
> - if (!indio_dev->buffer)
> - return;
> -
> - bitmap_free(indio_dev->buffer->scan_mask);
> - kfree(indio_dev->buffer->buffer_group.attrs);
> - kfree(indio_dev->buffer->scan_el_group.attrs);
> - iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list);
> + bitmap_free(buffer->scan_mask);
> + kfree(buffer->buffer_group.attrs);
> + kfree(buffer->scan_el_group.attrs);
> + iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
> }
>
> static const struct file_operations iio_buffer_fileops = {
> @@ -1425,13 +1419,19 @@ int iio_device_buffers_init(struct iio_dev *indio_dev, struct module *this_mod)
> if (!buffer)
> return -ENOTSUPP;
>
> + ret = iio_buffer_alloc_sysfs_and_mask(buffer);
> + if (ret)
> + return ret;
> +
> cdev_init(&buffer->chrdev, &iio_buffer_fileops);
>
> buffer->chrdev.owner = this_mod;
>
> ret = cdev_device_add(&buffer->chrdev, &indio_dev->dev);
> - if (ret)
> + if (ret) {
> + iio_buffer_free_sysfs_and_mask(buffer);
> return ret;
> + }
>
> iio_device_get(indio_dev);
> iio_buffer_get(buffer);
> @@ -1457,6 +1457,7 @@ void iio_device_buffers_uninit(struct iio_dev *indio_dev)
> return;
>
> cdev_device_del(&buffer->chrdev, &indio_dev->dev);
> + iio_buffer_free_sysfs_and_mask(buffer);
> iio_buffer_put(buffer);
> iio_device_put(indio_dev);
> }
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 2158aeab0bd2..794aaa4be832 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1737,18 +1737,11 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
>
> iio_device_register_debugfs(indio_dev);
>
> - ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
> - if (ret) {
> - dev_err(indio_dev->dev.parent,
> - "Failed to create buffer sysfs interfaces\n");
> - goto error_unreg_debugfs;
> - }
> -
> ret = iio_device_register_sysfs(indio_dev);
> if (ret) {
> dev_err(indio_dev->dev.parent,
> "Failed to register sysfs interfaces\n");
> - goto error_buffer_free_sysfs;
> + goto error_free_sysfs;
> }
> ret = iio_device_register_eventset(indio_dev);
> if (ret) {
> @@ -1785,9 +1778,6 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
> iio_device_unregister_eventset(indio_dev);
> error_free_sysfs:
> iio_device_unregister_sysfs(indio_dev);
> -error_buffer_free_sysfs:
> - iio_buffer_free_sysfs_and_mask(indio_dev);
> -error_unreg_debugfs:
> iio_device_unregister_debugfs(indio_dev);
> return ret;
> }
> @@ -1818,8 +1808,6 @@ void iio_device_unregister(struct iio_dev *indio_dev)
> iio_buffer_wakeup_poll(indio_dev);
>
> mutex_unlock(&indio_dev->info_exist_lock);
> -
> - iio_buffer_free_sysfs_and_mask(indio_dev);
> }
> EXPORT_SYMBOL(iio_device_unregister);
>
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