gpu: ion: Add api to get client from file id.

Change-Id: Ifb3bc3d7fa54cddda7e3f0acd34dbcc4b1ed39d3
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/72644
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Aleksandr Frid <afrid@nvidia.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/ion/ion.c b/drivers/gpu/ion/ion.c
index b90c4a826260..b32b1427e3e3 100644
--- a/drivers/gpu/ion/ion.c
+++ b/drivers/gpu/ion/ion.c
@@ -1114,3 +1114,19 @@ void ion_device_destroy(struct ion_device *dev)
 	/* XXX need to free the heaps and clients ? */
 	kfree(dev);
 }
+
+struct ion_client *ion_client_get_file(int fd)
+{
+	struct ion_client *client = ERR_PTR(-EFAULT);
+	struct file *f = fget(fd);
+	if (!f)
+		return ERR_PTR(-EINVAL);
+
+	if (f->f_op == &ion_fops) {
+		client = f->private_data;
+		ion_client_get(client);
+	}
+
+	fput(f);
+	return client;
+}