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

[Gustavo Padovan]

From: Gustavo Padovan <gustavo.pado...@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)

v3: return -EINVAL if flags are not zero'ed

v4: add padding for 64-bit alignment

Signed-off-by: Gustavo Padovan <gustavo.pado...@collabora.co.uk>
---
 drivers/staging/android/sync.c      |  8 ++++++++
 drivers/staging/android/uapi/sync.h | 14 ++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 3604e453..0196d3d 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 || data.pad) {
+               err = -EINVAL;
+               goto err_put_fd;
+       }
+
        fence2 = sync_file_fdget(data.fd2);
        if (!fence2) {
                err = -ENOENT;
@@ -504,6 +509,9 @@ static long sync_file_ioctl_fence_info(struct sync_file 
*sync_file,
        if (copy_from_user(&in, (void __user *)arg, sizeof(in)))
                return -EFAULT;
 
+       if (in.flags || in.pad)
+               return -EINVAL;
+
        info = kzalloc(sizeof(*info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;
diff --git a/drivers/staging/android/uapi/sync.h 
b/drivers/staging/android/uapi/sync.h
index a122bb5..859977c 100644
--- a/drivers/staging/android/uapi/sync.h
+++ b/drivers/staging/android/uapi/sync.h
@@ -16,14 +16,18 @@
 
 /**
  * struct sync_merge_data - data passed to merge ioctl
- * @fd2:       file descriptor of second fence
  * @name:      name of new fence
+ * @fd2:       file descriptor of second fence
  * @fence:     returns the fd of the new fence to userspace
+ * @flags:     merge_data flags
+ * @pad:       padding for 64-bit alignment, should always be zero
  */
 struct sync_merge_data {
-       __s32   fd2;
        char    name[32];
+       __s32   fd2;
        __s32   fence;
+       __u32   flags;
+       __u32   pad;
 };
 
 /**
@@ -31,12 +35,14 @@ 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;
 };
 
@@ -44,14 +50,18 @@ 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
+ * @pad:       padding for 64-bit alignment, should always be zero
  * @sync_fence_info: pointer to array of structs sync_fence_info with all
  *              fences in the sync_file
  */
 struct sync_file_info {
        char    name[32];
        __s32   status;
+       __u32   flags;
        __u32   num_fences;
+       __u32   pad;
 
        __u64   sync_fence_info;
 };
-- 
2.5.0

_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel