iwlwifi: avoid crash on unsupported debug collection

If the opmode doesn't support debug collection (DVM) then don't
crash, but just skip the callback.

Fixes: d01293154c0a ("iwlwifi: dbg: add op_mode callback for collecting debug data.")
Reported-by: Andy Lavr <andy.lavr@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210219133506.ecabe285bc7d.I73d230d555c595fa2d9bf284f80078729fe18aa4@changeid

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-op-mode.h b/drivers/net/wireless/intel/iwlwifi/iwl-op-mode.h
index 868da7e79a45507ba2a8851267cb56b402569591..e6d2e09943170af6fb48334d34182f74dc8f7ad5 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/iwl-op-mode.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-op-mode.h
@@ -205,6 +205,8 @@ static inline void iwl_op_mode_time_point(struct iwl_op_mode *op_mode,
                                          enum iwl_fw_ini_time_point tp_id,
                                          union iwl_dbg_tlv_tp_data *tp_data)
 {
+       if (!op_mode || !op_mode->ops || !op_mode->ops->time_point)
+               return;
        op_mode->ops->time_point(op_mode, tp_id, tp_data);
 }