gpu: nvgpu: warn if cde map fails

This shouldn't happen, but is dangerous enough to warrant its own
warning if it does. A message might help debug a rare corruption bug.

Bug 2038362

Change-Id: I7915760fc31e7acaa0148a10f9acae303d53ea95
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1815863
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/cde.c b/drivers/gpu/nvgpu/os/linux/cde.c
index 7aac8e01..074fe5ce 100644
--- a/drivers/gpu/nvgpu/os/linux/cde.c
+++ b/drivers/gpu/nvgpu/os/linux/cde.c
@@ -1106,6 +1106,8 @@ __releases(&l->cde_app->mutex)
                                  NULL,
                                  &map_vaddr);
         if (err) {
+                nvgpu_warn(g, "cde: failed to map compbits scatter buf at %lld size %lld",
+                                map_offset, map_size);
                 dma_buf_put(compbits_scatter_buf);
                 err = -EINVAL;
                 goto exit_idle;