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

[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_job.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_job.c 
b/drivers/gpu/drm/imagination/pvr_job.c
index 78c2f3c6dce0..618503a212a7 100644
--- a/drivers/gpu/drm/imagination/pvr_job.c
+++ b/drivers/gpu/drm/imagination/pvr_job.c
@@ -90,20 +90,13 @@ static int pvr_fw_cmd_init(struct pvr_device *pvr_dev, 
struct pvr_job *job,
        void *stream;
        int err;
 
-       stream = kzalloc(stream_len, GFP_KERNEL);
-       if (!stream)
-               return -ENOMEM;
-
-       if (copy_from_user(stream, u64_to_user_ptr(stream_userptr), 
stream_len)) {
-               err = -EFAULT;
-               goto err_free_stream;
-       }
+       stream = memdup_user(u64_to_user_ptr(stream_userptr), stream_len);
+       if (IS_ERR(stream))
+               return PTR_ERR(stream);
 
        err = pvr_job_process_stream(pvr_dev, stream_def, stream, stream_len, 
job);
 
-err_free_stream:
        kfree(stream);
-
        return err;
 }
 
-- 
2.34.1