Re: [PATCH v4 5/5] staging/android: add flags member to sync ioctl structs

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Gustavo Padovan <gustavo@padovan.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org,
	dri-devel@lists.freedesktop.org,
	"Daniel Stone" <daniels@collabora.com>,
	"Arve Hjønnevåg" <arve@android.com>,
	"Riley Andrews" <riandrews@android.com>,
	"Daniel Vetter" <daniel.vetter@ffwll.ch>,
	"Rob Clark" <robdclark@gmail.com>,
	"Greg Hackmann" <ghackmann@google.com>,
	"John Harrison" <John.C.Harrison@Intel.com>,
	"Gustavo Padovan" <gustavo.padovan@collabora.co.uk>
Subject: Re: [PATCH v4 5/5] staging/android: add flags member to sync ioctl structs
Date: Mon, 29 Feb 2016 09:30:41 +0100	[thread overview]
Message-ID: <56D401B1.7080200@linux.intel.com> (raw)
In-Reply-To: <1456511507-2534-5-git-send-email-gustavo@padovan.org>

Op 26-02-16 om 19:31 schreef Gustavo Padovan:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
>
> Play safe and add flags member to all structs. So we don't need to
> break API or create new IOCTL in the future if new features that requires
> flags arises.
>
> v2: check if flags are valid (zero, in this case)
>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> ---
>  drivers/staging/android/sync.c      | 7 ++++++-
>  drivers/staging/android/uapi/sync.h | 6 ++++++
>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
> index 837cff5..54fd5ab 100644
> --- a/drivers/staging/android/sync.c
> +++ b/drivers/staging/android/sync.c
> @@ -445,6 +445,11 @@ static long sync_file_ioctl_merge(struct sync_file *sync_file,
>  		goto err_put_fd;
>  	}
>  
> +	if (data.flags) {
> +		err = -EFAULT;
> +		goto err_put_fd;
> +	}
-EINVAL
>  	fence2 = sync_file_fdget(data.fd2);
>  	if (!fence2) {
>  		err = -ENOENT;
> @@ -511,7 +516,7 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
>  	if (copy_from_user(&in, (void __user *)arg, sizeof(*info)))
>  		return -EFAULT;
>  
> -	if (in.status || strcmp(in.name, "\0"))
> +	if (in.status || in.flags || strcmp(in.name, "\0"))
>  		return -EFAULT;
-EINVAL
>  	if (in.num_fences && !in.sync_fence_info)
> diff --git a/drivers/staging/android/uapi/sync.h b/drivers/staging/android/uapi/sync.h
> index 9aad623..f56a6c2 100644
> --- a/drivers/staging/android/uapi/sync.h
> +++ b/drivers/staging/android/uapi/sync.h
> @@ -19,11 +19,13 @@
>   * @fd2:	file descriptor of second fence
>   * @name:	name of new fence
>   * @fence:	returns the fd of the new fence to userspace
> + * @flags:	merge_data flags
>   */
>  struct sync_merge_data {
>  	__s32	fd2;
>  	char	name[32];
>  	__s32	fence;
> +	__u32	flags;
>  };
>  
>  /**
> @@ -31,12 +33,14 @@ struct sync_merge_data {
>   * @obj_name:		name of parent sync_timeline
>   * @driver_name:	name of driver implementing the parent
>   * @status:		status of the fence 0:active 1:signaled <0:error
> + * @flags:		fence_info flags
>   * @timestamp_ns:	timestamp of status change in nanoseconds
>   */
>  struct sync_fence_info {
>  	char	obj_name[32];
>  	char	driver_name[32];
>  	__s32	status;
> +	__u32	flags;
>  	__u64	timestamp_ns;
>  };
>  
> @@ -44,6 +48,7 @@ struct sync_fence_info {
>   * struct sync_file_info - data returned from fence info ioctl
>   * @name:	name of fence
>   * @status:	status of fence. 1: signaled 0:active <0:error
> + * @flags:	sync_file_info flags
>   * @num_fences	number of fences in the sync_file
>   * @len:	ioctl caller writes the size of the buffer its passing in.
>   *		ioctl returns length of all fence_infos summed.
> @@ -52,6 +57,7 @@ struct sync_fence_info {
>  struct sync_file_info {
>  	char	name[32];
>  	__s32	status;
> +	__u32	flags;
>  	__u32	num_fences;
>  	__u32	len;
>