gpu: nvgpu: Sparse fixes in gpfifo_mem user gpfifo

1) Keep the __user tag in the type of the user gpfifo when copying,
2) use NULL instead of 0 for initializing user_gpfifo pointer.

Bug 200067946

Change-Id: I631b4bca44ded0900204134338fa1d62d0017df0
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1168441
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index cc097ae4..db0f746f 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -2047,7 +2047,7 @@ static int gk20a_submit_append_gpfifo(struct channel_gk20a *c,
                         /* wrap-around */
                         int length0 = gpfifo_size - start;
                         int length1 = len - length0;
-                        void *user2 = (u8*)user_gpfifo + length0;
+                        void __user *user2 = (u8 __user *)user_gpfifo + length0;
 
                         err = copy_from_user(gpfifo_mem->cpu_va + start,
                                         user_gpfifo, length0);
@@ -2130,7 +2130,7 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
         bool need_sync_fence = false;
         bool new_sync_created = false;
         struct nvgpu_gpfifo __user *user_gpfifo = args ?
-                (struct nvgpu_gpfifo __user *)(uintptr_t)args->gpfifo : 0;
+                (struct nvgpu_gpfifo __user *)(uintptr_t)args->gpfifo : NULL;
 
         /*
          * If user wants to allocate sync_fence_fd always, then respect that;