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Date: Tue, 28 Dec 2021 18:31:42 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>
Cc: William Breathitt Gray <vilhelm.gray@...il.com>,
Lars-Peter Clausen <lars@...afoo.de>, kernel@...gutronix.de,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
linux-iio@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 23/23] counter: remove old and now unused
registration API
On Mon, 27 Dec 2021 10:45:26 +0100
Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:
> Usage of counter_register() yields issues in device lifetime tracking. All
> drivers were converted to the new API, so the old one can go away.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
LGTM and nice patch set in general. Just those few things in the
patch introducing the new interfaces that need tidying up as far as I am
concerned.
Thanks,
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---
> drivers/counter/counter-core.c | 97 ++--------------------------------
> include/linux/counter.h | 12 -----
> 2 files changed, 4 insertions(+), 105 deletions(-)
>
> diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
> index 8261567b6272..3f7dc5718423 100644
> --- a/drivers/counter/counter-core.c
> +++ b/drivers/counter/counter-core.c
> @@ -38,8 +38,7 @@ static void counter_device_release(struct device *dev)
> counter_chrdev_remove(counter);
> ida_free(&counter_ida, dev->id);
>
> - if (!counter->legacy_device)
> - kfree(container_of(counter, struct counter_device_allochelper, counter));
> + kfree(container_of(counter, struct counter_device_allochelper, counter));
> }
>
> static struct device_type counter_device_type = {
> @@ -62,76 +61,13 @@ static dev_t counter_devt;
> */
> void *counter_priv(const struct counter_device *const counter)
> {
> - if (counter->legacy_device) {
> - return counter->priv;
> - } else {
> - struct counter_device_allochelper *ch =
> - container_of(counter, struct counter_device_allochelper, counter);
> + struct counter_device_allochelper *ch =
> + container_of(counter, struct counter_device_allochelper, counter);
>
> - return &ch->privdata;
> - }
> + return &ch->privdata;
> }
> EXPORT_SYMBOL_GPL(counter_priv);
>
> -/**
> - * counter_register - register Counter to the system
> - * @counter: pointer to Counter to register
> - *
> - * This function registers a Counter to the system. A sysfs "counter" directory
> - * will be created and populated with sysfs attributes correlating with the
> - * Counter Signals, Synapses, and Counts respectively.
> - *
> - * RETURNS:
> - * 0 on success, negative error number on failure.
> - */
> -int counter_register(struct counter_device *const counter)
> -{
> - struct device *const dev = &counter->dev;
> - int id;
> - int err;
> -
> - counter->legacy_device = true;
> -
> - /* Acquire unique ID */
> - id = ida_alloc(&counter_ida, GFP_KERNEL);
> - if (id < 0)
> - return id;
> -
> - mutex_init(&counter->ops_exist_lock);
> -
> - /* Configure device structure for Counter */
> - dev->id = id;
> - dev->type = &counter_device_type;
> - dev->bus = &counter_bus_type;
> - dev->devt = MKDEV(MAJOR(counter_devt), id);
> - if (counter->parent) {
> - dev->parent = counter->parent;
> - dev->of_node = counter->parent->of_node;
> - }
> - device_initialize(dev);
> -
> - err = counter_sysfs_add(counter);
> - if (err < 0)
> - goto err_free_id;
> -
> - err = counter_chrdev_add(counter);
> - if (err < 0)
> - goto err_free_id;
> -
> - err = cdev_device_add(&counter->chrdev, dev);
> - if (err < 0)
> - goto err_remove_chrdev;
> -
> - return 0;
> -
> -err_remove_chrdev:
> - counter_chrdev_remove(counter);
> -err_free_id:
> - put_device(dev);
> - return err;
> -}
> -EXPORT_SYMBOL_GPL(counter_register);
> -
> /**
> * counter_alloc - allocate a counter_device
> * @sizeof_priv: size of the driver private data
> @@ -255,31 +191,6 @@ static void devm_counter_release(void *counter)
> counter_unregister(counter);
> }
>
> -/**
> - * devm_counter_register - Resource-managed counter_register
> - * @dev: device to allocate counter_device for
> - * @counter: pointer to Counter to register
> - *
> - * Managed counter_register. The Counter registered with this function is
> - * automatically unregistered on driver detach. This function calls
> - * counter_register internally. Refer to that function for more information.
> - *
> - * RETURNS:
> - * 0 on success, negative error number on failure.
> - */
> -int devm_counter_register(struct device *dev,
> - struct counter_device *const counter)
> -{
> - int err;
> -
> - err = counter_register(counter);
> - if (err < 0)
> - return err;
> -
> - return devm_add_action_or_reset(dev, devm_counter_release, counter);
> -}
> -EXPORT_SYMBOL_GPL(devm_counter_register);
> -
> static void devm_counter_put(void *counter)
> {
> counter_put(counter);
> diff --git a/include/linux/counter.h b/include/linux/counter.h
> index f1350a43cd48..9afa0f1e9cea 100644
> --- a/include/linux/counter.h
> +++ b/include/linux/counter.h
> @@ -314,8 +314,6 @@ struct counter_device {
> struct counter_comp *ext;
> size_t num_ext;
>
> - void *priv;
> -
> struct device dev;
> struct cdev chrdev;
> struct list_head events_list;
> @@ -327,25 +325,15 @@ struct counter_device {
> spinlock_t events_in_lock;
> struct mutex events_out_lock;
> struct mutex ops_exist_lock;
> -
> - /*
> - * This can go away once all drivers are converted to
> - * counter_alloc()/counter_add().
> - */
> - bool legacy_device;
> };
>
> void *counter_priv(const struct counter_device *const counter);
>
> -int counter_register(struct counter_device *const counter);
> -
> struct counter_device *counter_alloc(size_t sizeof_priv);
> void counter_put(struct counter_device *const counter);
> int counter_add(struct counter_device *const counter);
>
> void counter_unregister(struct counter_device *const counter);
> -int devm_counter_register(struct device *dev,
> - struct counter_device *const counter);
> struct counter_device *devm_counter_alloc(struct device *dev,
> size_t sizeof_priv);
> int devm_counter_add(struct device *dev,
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