gpu: nvgpu: warn on nested ctx patch begin

Add WARN_ON to a critical error condition to get a backtrace dump.

Bug 200046882

Change-Id: I76c4186024547c6e89f1465612fe17f44e27eefe
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index 47f11a1f..63ab6c9f 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -593,7 +593,7 @@ int gr_gk20a_ctx_patch_write_begin(struct gk20a *g,
                                           struct channel_ctx_gk20a *ch_ctx)
 {
         /* being defensive still... */
-        if (ch_ctx->patch_ctx.cpu_va) {
+        if (WARN_ON(ch_ctx->patch_ctx.cpu_va)) {
                 gk20a_err(dev_from_gk20a(g), "nested ctx patch begin?");
                 return -EBUSY;
         }