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Date:   Mon, 21 Jan 2019 08:19:20 +0800
From:   Wei Yang <richardw.yang@linux.intel.com>
To:     "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Wei Yang <richardw.yang@linux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v2] driver core: move device->knode_class to
 device_private
Message-ID: <20190121001920.GA3680@richard>
Reply-To: Wei Yang <richardw.yang@linux.intel.com>
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On Fri, Jan 18, 2019 at 11:06:23AM +0100, Rafael J. Wysocki wrote:
>On Fri, Jan 18, 2019 at 3:35 AM Wei Yang <richardw.yang@linux.intel.com> wrote:
>>
>> As the description of struct device_private says, it stores data which
>> is private to driver core. And it already has similar fields like:
>> knode_parent, knode_driver, knode_driver and knode_bus. This look it is
>> more proper to put knode_class together with those fields to make it
>> private to driver core.
>>
>> This patch move device->knode_class to device_private to make it comply
>> with code convention.
>>
>> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
>>
>> ---
>> v2: add a helper to get dev from klist_class
>
>Looks better now.
>
>Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Thanks :-)

>
>> ---
>>  drivers/base/base.h    |  4 ++++
>>  drivers/base/class.c   | 14 ++++++++++----
>>  drivers/base/core.c    |  4 ++--
>>  include/linux/device.h |  1 -
>>  4 files changed, 16 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/base/base.h b/drivers/base/base.h
>> index 7a419a7a6235..37329a668935 100644
>> --- a/drivers/base/base.h
>> +++ b/drivers/base/base.h
>> @@ -60,6 +60,7 @@ struct driver_private {
>>   * @knode_parent - node in sibling list
>>   * @knode_driver - node in driver list
>>   * @knode_bus - node in bus list
>> + * @knode_class - node in class list
>>   * @deferred_probe - entry in deferred_probe_list which is used to retry the
>>   *     binding of drivers which were unable to get all the resources needed by
>>   *     the device; typically because it depends on another driver getting
>> @@ -74,6 +75,7 @@ struct device_private {
>>         struct klist_node knode_parent;
>>         struct klist_node knode_driver;
>>         struct klist_node knode_bus;
>> +       struct klist_node knode_class;
>>         struct list_head deferred_probe;
>>         struct device *device;
>>  };
>> @@ -83,6 +85,8 @@ struct device_private {
>>         container_of(obj, struct device_private, knode_driver)
>>  #define to_device_private_bus(obj)     \
>>         container_of(obj, struct device_private, knode_bus)
>> +#define to_device_private_class(obj)   \
>> +       container_of(obj, struct device_private, knode_class)
>>
>>  /* initialisation functions */
>>  extern int devices_init(void);
>> diff --git a/drivers/base/class.c b/drivers/base/class.c
>> index 54def4e02f00..d8a6a5864c2e 100644
>> --- a/drivers/base/class.c
>> +++ b/drivers/base/class.c
>> @@ -117,16 +117,22 @@ static void class_put(struct class *cls)
>>                 kset_put(&cls->p->subsys);
>>  }
>>
>> +static struct device *klist_class_to_dev(struct klist_node *n)
>> +{
>> +       struct device_private *p = to_device_private_class(n);
>> +       return p->device;
>> +}
>> +
>>  static void klist_class_dev_get(struct klist_node *n)
>>  {
>> -       struct device *dev = container_of(n, struct device, knode_class);
>> +       struct device *dev = klist_class_to_dev(n);
>>
>>         get_device(dev);
>>  }
>>
>>  static void klist_class_dev_put(struct klist_node *n)
>>  {
>> -       struct device *dev = container_of(n, struct device, knode_class);
>> +       struct device *dev = klist_class_to_dev(n);
>>
>>         put_device(dev);
>>  }
>> @@ -277,7 +283,7 @@ void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
>>         struct klist_node *start_knode = NULL;
>>
>>         if (start)
>> -               start_knode = &start->knode_class;
>> +               start_knode = &start->p->knode_class;
>>         klist_iter_init_node(&class->p->klist_devices, &iter->ki, start_knode);
>>         iter->type = type;
>>  }
>> @@ -304,7 +310,7 @@ struct device *class_dev_iter_next(struct class_dev_iter *iter)
>>                 knode = klist_next(&iter->ki);
>>                 if (!knode)
>>                         return NULL;
>> -               dev = container_of(knode, struct device, knode_class);
>> +               dev = klist_class_to_dev(knode);
>>                 if (!iter->type || iter->type == dev->type)
>>                         return dev;
>>         }
>> diff --git a/drivers/base/core.c b/drivers/base/core.c
>> index 04bbcd779e11..a624d27d11c0 100644
>> --- a/drivers/base/core.c
>> +++ b/drivers/base/core.c
>> @@ -1932,7 +1932,7 @@ int device_add(struct device *dev)
>>         if (dev->class) {
>>                 mutex_lock(&dev->class->p->mutex);
>>                 /* tie the class to the device */
>> -               klist_add_tail(&dev->knode_class,
>> +               klist_add_tail(&dev->p->knode_class,
>>                                &dev->class->p->klist_devices);
>>
>>                 /* notify any interfaces that the device is here */
>> @@ -2069,7 +2069,7 @@ void device_del(struct device *dev)
>>                         if (class_intf->remove_dev)
>>                                 class_intf->remove_dev(dev, class_intf);
>>                 /* remove the device from the class list */
>> -               klist_del(&dev->knode_class);
>> +               klist_del(&dev->p->knode_class);
>>                 mutex_unlock(&dev->class->p->mutex);
>>         }
>>         device_remove_file(dev, &dev_attr_uevent);
>> diff --git a/include/linux/device.h b/include/linux/device.h
>> index 1b25c7a43f4c..040e97669f94 100644
>> --- a/include/linux/device.h
>> +++ b/include/linux/device.h
>> @@ -1035,7 +1035,6 @@ struct device {
>>         spinlock_t              devres_lock;
>>         struct list_head        devres_head;
>>
>> -       struct klist_node       knode_class;
>>         struct class            *class;
>>         const struct attribute_group **groups;  /* optional groups */
>>
>> --
>> 2.19.1
>>

-- 
Wei Yang
Help you, Help me