habanalabs: skip events info ioctl if not supported

Some ASICs haven't yet implemented this functionality and so the
ioctl call should fail and the user should be notified of the reason.

Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

diff --git a/drivers/misc/habanalabs/common/habanalabs_ioctl.c b/drivers/misc/habanalabs/common/habanalabs_ioctl.c
index ee43017..b6abfa7 100644 (file)
--- a/drivers/misc/habanalabs/common/habanalabs_ioctl.c
+++ b/drivers/misc/habanalabs/common/habanalabs_ioctl.c
@@ -123,6 +123,10 @@ static int hw_events_info(struct hl_device *hdev, bool aggregate,
                return -EINVAL;
 
        arr = hdev->asic_funcs->get_events_stat(hdev, aggregate, &size);
+       if (!arr) {
+               dev_err(hdev->dev, "Events info not supported\n");
+               return -EOPNOTSUPP;
+       }
 
        return copy_to_user(out, arr, min(max_size, size)) ? -EFAULT : 0;
 }