linux-kernel - Re: [PATCH v2 06/13] staging/android: remove name arg from sync_file

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Date:	Fri, 29 Apr 2016 17:01:58 +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 06/13] staging/android: remove name arg from sync_file_create()

> 
> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> 
> Simplifies the API to only receive the fence it needs to add to the
> sync and create a name for the sync_file based on the fence context and
> seqno.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> ---
>  drivers/staging/android/sync.c       | 16 +++++++++-------
>  drivers/staging/android/sync.h       |  2 +-
>  drivers/staging/android/sync_debug.c |  3 +--
>  3 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
> index 7e0fa20..5470ae9 100644
> --- a/drivers/staging/android/sync.c
> +++ b/drivers/staging/android/sync.c
> @@ -136,7 +136,7 @@ struct fence *sync_pt_create(struct sync_timeline *obj, int size)
>  }
>  EXPORT_SYMBOL(sync_pt_create);
> 
> -static struct sync_file *sync_file_alloc(int size, const char *name)
> +static struct sync_file *sync_file_alloc(int size)
>  {
>  	struct sync_file *sync_file;
> 
> @@ -150,7 +150,6 @@ static struct sync_file *sync_file_alloc(int size, const char *name)
>  		goto err;
> 
>  	kref_init(&sync_file->kref);
> -	strlcpy(sync_file->name, name, sizeof(sync_file->name));
> 
>  	init_waitqueue_head(&sync_file->wq);
> 
> @@ -175,23 +174,25 @@ static void fence_check_cb_func(struct fence *f, struct fence_cb *cb)
> 
>  /**
>   * sync_fence_create() - creates a sync fence
> - * @name:	name of fence to create
>   * @fence:	fence to add to the sync_fence
>   *
>   * Creates a sync_file containg @fence. Once this is called, the sync_file
>   * takes ownership of @fence.
>   */
> -struct sync_file *sync_file_create(const char *name, struct fence *fence)
> +struct sync_file *sync_file_create(struct fence *fence)
>  {
>  	struct sync_file *sync_file;
> 
> -	sync_file = sync_file_alloc(offsetof(struct sync_file, cbs[1]),
> -				    name);
> +	sync_file = sync_file_alloc(offsetof(struct sync_file, cbs[1]));
>  	if (!sync_file)
>  		return NULL;
> 
>  	sync_file->num_fences = 1;
>  	atomic_set(&sync_file->status, 1);
> +	snprintf(sync_file->name, sizeof(sync_file->name), "%s-%s%d-%d",
> +		 fence->ops->get_driver_name(fence),
> +		 fence->ops->get_timeline_name(fence), fence->context,
> +		 fence->seqno);
> 
>  	sync_file->cbs[0].fence = fence;
>  	sync_file->cbs[0].sync_file = sync_file;
> @@ -260,7 +261,7 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
>  	int i, i_a, i_b;
>  	unsigned long size = offsetof(struct sync_file, cbs[num_fences]);
> 
> -	sync_file = sync_file_alloc(size, name);
> +	sync_file = sync_file_alloc(size);
>  	if (!sync_file)
>  		return NULL;
> 
> @@ -306,6 +307,7 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
>  		atomic_sub(num_fences - i, &sync_file->status);
>  	sync_file->num_fences = i;
> 
> +	strlcpy(sync_file->name, name, sizeof(sync_file->name));
>  	sync_file_debug_add(sync_file);
>  	return sync_file;
>  }
> diff --git a/drivers/staging/android/sync.h b/drivers/staging/android/sync.h
> index 1f164df..7dee444 100644
> --- a/drivers/staging/android/sync.h
> +++ b/drivers/staging/android/sync.h
> @@ -167,7 +167,7 @@ void sync_timeline_signal(struct sync_timeline *obj);
>   */
>  struct fence *sync_pt_create(struct sync_timeline *parent, int size);
> 
> -struct sync_file *sync_file_create(const char *name, struct fence *fence);
> +struct sync_file *sync_file_create(struct fence *fence);
> 
>  #ifdef CONFIG_DEBUG_FS
> 
> diff --git a/drivers/staging/android/sync_debug.c b/drivers/staging/android/sync_debug.c
> index e4b0e41..2cab40d 100644
> --- a/drivers/staging/android/sync_debug.c
> +++ b/drivers/staging/android/sync_debug.c
> @@ -262,8 +262,7 @@ static long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj,
>  		goto err;
>  	}
> 
> -	data.name[sizeof(data.name) - 1] = '\0';
> -	sync_file = sync_file_create(data.name, fence);
> +	sync_file = sync_file_create(fence);


The name injected from user spce is ignored, why?
Is it a semantic change?
Mentioned in commit message?

>  	if (!sync_file) {
>  		fence_put(fence);
>  		err = -ENOMEM;
> --
> 2.5.5
> 
>