linux-4.4.1/ion_alloc() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/ion_alloc() へ行く。
• linux-4.4.1/ion_alloc() の差分を削除

*参照元 [#a0a59825]
#backlinks

*説明 [#w6329a9e]
-パス: [[linux-4.4.1/drivers/staging/android/ion/ion.c]]

-FIXME: これは何？
--説明


**引数 [#e28bb246]
-struct ion_client *client
--
--[[linux-4.4.1/ion_client]]
-size_t len
--
-size_t align
--
-unsigned int heap_id_mask
--
-unsigned int flags
--


**返り値 [#q0977eb4]
-struct ion_handle *
--
--[[linux-4.4.1/ion_handle]]


**参考 [#g69f313c]


*実装 [#s391287f]
 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
                              size_t align, unsigned int heap_id_mask,
                              unsigned int flags)
 {
         struct ion_handle *handle;
         struct ion_device *dev = client->dev;
         struct ion_buffer *buffer = NULL;
         struct ion_heap *heap;
         int ret;
 
-
--[[linux-4.4.1/ion_handle]]
--[[linux-4.4.1/ion_device]]
--[[linux-4.4.1/ion_buffer]]
--[[linux-4.4.1/ion_heap]]

         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
                  len, align, heap_id_mask, flags);
-
--[[linux-4.4.1/pr_debug()]]

         /*
          * traverse the list of heaps available in this system in priority
          * order.  If the heap type is supported by the client, and matches the
          * request of the caller allocate from it.  Repeat until allocate has
          * succeeded or all heaps have been tried
          */
         len = PAGE_ALIGN(len);
 
         if (!len)
                 return ERR_PTR(-EINVAL);
 
-
--[[linux-4.4.1/PAGE_ALIGN()]]
--[[linux-4.4.1/ERR_PTR()]]

         down_read(&dev->lock);
         plist_for_each_entry(heap, &dev->heaps, node) {
                 /* if the caller didn't specify this heap id */
                 if (!((1 << heap->id) & heap_id_mask))
                         continue;
                 buffer = ion_buffer_create(heap, dev, len, align, flags);
                 if (!IS_ERR(buffer))
                         break;
         }
         up_read(&dev->lock);
 
-
--[[linux-4.4.1/down_read()]]
--[[linux-4.4.1/plist_for_each_entry()]]
--[[linux-4.4.1/ion_buffer_create()]]
--[[linux-4.4.1/IS_ERR()]]
--[[linux-4.4.1/up_read()]]

         if (buffer == NULL)
                 return ERR_PTR(-ENODEV);
 
         if (IS_ERR(buffer))
                 return ERR_CAST(buffer);
 
-
--[[linux-4.4.1/ERR_CAST()]]

         handle = ion_handle_create(client, buffer);
 
-
--[[linux-4.4.1/ion_handle_create()]]

         /*
          * ion_buffer_create will create a buffer with a ref_cnt of 1,
          * and ion_handle_create will take a second reference, drop one here
          */
         ion_buffer_put(buffer);
 
-
--[[linux-4.4.1/ion_buffer_put()]]

         if (IS_ERR(handle))
                 return handle;
 
         mutex_lock(&client->lock);
         ret = ion_handle_add(client, handle);
         mutex_unlock(&client->lock);
         if (ret) {
                 ion_handle_put(handle);
                 handle = ERR_PTR(ret);
         }
 
-
--[[linux-4.4.1/mutex_lock()]]
--[[linux-4.4.1/ion_handle_add()]]
--[[linux-4.4.1/mutex_unlock()]]

         return handle;
 }
 EXPORT_SYMBOL(ion_alloc);
-
--[[linux-4.4.1/EXPORT_SYMBOL()]]


*コメント [#v6cc55ab]