[PATCH -next] drm/imagination: Use memdup_user() helper

[Jinjie Ruan]

Switching to memdup_user(), which combines kmalloc() and copy_from_user(),
and it can simplfy code.

Signed-off-by: Jinjie Ruan <ruanjin...@huawei.com>
---
 drivers/gpu/drm/imagination/pvr_context.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_context.c 
b/drivers/gpu/drm/imagination/pvr_context.c
index eded5e955cc0..e75fd50a4d9f 100644
--- a/drivers/gpu/drm/imagination/pvr_context.c
+++ b/drivers/gpu/drm/imagination/pvr_context.c
@@ -69,27 +69,19 @@ process_static_context_state(struct pvr_device *pvr_dev, 
const struct pvr_stream
        void *stream;
        int err;
 
-       stream = kzalloc(stream_size, GFP_KERNEL);
-       if (!stream)
-               return -ENOMEM;
-
-       if (copy_from_user(stream, u64_to_user_ptr(stream_user_ptr), 
stream_size)) {
-               err = -EFAULT;
-               goto err_free;
-       }
+       stream = memdup_user(u64_to_user_ptr(stream_user_ptr), stream_size);
+       if (IS_ERR(stream))
+               return PTR_ERR(stream);
 
        err = pvr_stream_process(pvr_dev, cmd_defs, stream, stream_size, dest);
-       if (err)
-               goto err_free;
+       if (err) {
+               kfree(stream);
+               return err;
+       }
 
        kfree(stream);
 
        return 0;
-
-err_free:
-       kfree(stream);
-
-       return err;
 }
 
 static int init_render_fw_objs(struct pvr_context *ctx,
-- 
2.34.1