Date:	Fri, 29 Apr 2016 16:14:28 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Gustavo Padovan'" <gustavo.padovan@...labora.co.uk>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 02/13] staging/android: drop sync_file_install() and sync_file_put()

> 
> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> 
> These two functions are just wrappers for one line functions, they
> call fd_install() and fput() respectively, so just get rid of them
> and use fd_install() and fput() directly for more simplicity.
> 
Given sync_file is not file, I don't see that simplicity is worth of
the change of 20+ lines.
Can you please specify the disadvantages of the wrappers?

> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> ---
>  drivers/staging/android/sync.c       | 20 ++++----------------
>  drivers/staging/android/sync.h       | 19 -------------------
>  drivers/staging/android/sync_debug.c |  4 ++--
>  3 files changed, 6 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
> index f9c6094..b965e2a 100644
> --- a/drivers/staging/android/sync.c
> +++ b/drivers/staging/android/sync.c
> @@ -216,18 +216,6 @@ err:
>  }
>  EXPORT_SYMBOL(sync_file_fdget);
> 
> -void sync_file_put(struct sync_file *sync_file)
> -{
> -	fput(sync_file->file);
> -}
> -EXPORT_SYMBOL(sync_file_put);
> -
> -void sync_file_install(struct sync_file *sync_file, int fd)
> -{
> -	fd_install(fd, sync_file->file);
> -}
> -EXPORT_SYMBOL(sync_file_install);
> -
>  static void sync_file_add_pt(struct sync_file *sync_file, int *i,
>  			     struct fence *fence)
>  {
> @@ -469,15 +457,15 @@ static long sync_file_ioctl_merge(struct sync_file *sync_file,
>  		goto err_put_fence3;
>  	}
> 
> -	sync_file_install(fence3, fd);
> -	sync_file_put(fence2);
> +	fd_install(fd, fence3->file);
> +	fput(fence2->file);
>  	return 0;
> 
>  err_put_fence3:
> -	sync_file_put(fence3);
> +	fput(fence3->file);
> 
>  err_put_fence2:
> -	sync_file_put(fence2);
> +	fput(fence2->file);
> 
>  err_put_fd:
>  	put_unused_fd(fd);
> diff --git a/drivers/staging/android/sync.h b/drivers/staging/android/sync.h
> index d2a1734..c45cc7b 100644
> --- a/drivers/staging/android/sync.h
> +++ b/drivers/staging/android/sync.h
> @@ -203,25 +203,6 @@ struct sync_file *sync_file_merge(const char *name,
>   */
>  struct sync_file *sync_file_fdget(int fd);
> 
> -/**
> - * sync_file_put() - puts a reference of a sync_file
> - * @sync_file:	sync_file to put
> - *
> - * Puts a reference on @sync_fence.  If this is the last reference, the
> - * sync_fil and all it's sync_pts will be freed
> - */
> -void sync_file_put(struct sync_file *sync_file);
> -
> -/**
> - * sync_file_install() - installs a sync_file into a file descriptor
> - * @sync_file:	sync_file to install
> - * @fd:		file descriptor in which to install the fence
> - *
> - * Installs @sync_file into @fd.  @fd's should be acquired through
> - * get_unused_fd_flags(O_CLOEXEC).
> - */
> -void sync_file_install(struct sync_file *sync_file, int fd);
> -
>  #ifdef CONFIG_DEBUG_FS
> 
>  void sync_timeline_debug_add(struct sync_timeline *obj);
> diff --git a/drivers/staging/android/sync_debug.c b/drivers/staging/android/sync_debug.c
> index 5a7ec58..e4b0e41 100644
> --- a/drivers/staging/android/sync_debug.c
> +++ b/drivers/staging/android/sync_debug.c
> @@ -272,12 +272,12 @@ static long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj,
> 
>  	data.fence = fd;
>  	if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
> -		sync_file_put(sync_file);
> +		fput(sync_file->file);
>  		err = -EFAULT;
>  		goto err;
>  	}
> 
> -	sync_file_install(sync_file, fd);
> +	fd_install(fd, sync_file->file);
> 
>  	return 0;
> 
> --
> 2.5.5
> 
> 

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