qcacld-3.0: Add process for userspace does not set avoid channel list

In platforms that support dual wifi instances, userspace doesn't
set avoid frequency channel list with command
QCA_NL80211_VENDOR_SUBCMD_AVOID_FREQUENCY to trigger restart sap
process, but current handling is always to check avoid channel list
which is set by userspace so it will be failed for lte coex case.

Fix is to add process for userspace doesn't set avoid channel list.

Change-Id: Icc3356191411791f4cec9fd89e4490359cf6f1fc
CRs-Fixed: 2294109

core/hdd/src/wlan_hdd_cfg80211.c

@@ -7977,10 +7977,12 @@ __wlan_hdd_cfg80211_avoid_freq(struct wiphy *wiphy,
 	int ret;
 	qdf_device_t qdf_ctx = cds_get_context(QDF_MODULE_ID_QDF_DEVICE);
 	uint16_t *local_unsafe_list;
+	uint16_t unsafe_channel_count;
 	uint16_t unsafe_channel_index, local_unsafe_list_count;
 	struct ch_avoid_ind_type *channel_list;
 	enum QDF_GLOBAL_MODE curr_mode;
 	uint8_t num_args = 0;
+	bool user_set_avoid_channel = true;
 
 	hdd_enter_dev(wdev->netdev);
 
@@ -7998,6 +8000,11 @@ __wlan_hdd_cfg80211_avoid_freq(struct wiphy *wiphy,
 	ret = wlan_hdd_validate_context(hdd_ctx);
 	if (0 != ret)
 		return ret;
+	if (!data && data_len == 0) {
+		hdd_debug("Userspace doesn't set avoid frequency channel list");
+		user_set_avoid_channel = false;
+		goto process_unsafe_channel;
+	}
 	if (!data || data_len < (sizeof(channel_list->ch_avoid_range_cnt) +
 				 sizeof(struct ch_avoid_freq_type))) {
 		hdd_err("Avoid frequency channel list empty");
@@ -8021,6 +8028,7 @@ __wlan_hdd_cfg80211_avoid_freq(struct wiphy *wiphy,
 		return -EINVAL;
 	}
 
+process_unsafe_channel:
 	ret = hdd_clone_local_unsafe_chan(hdd_ctx,
 					  &local_unsafe_list,
 					  &local_unsafe_list_count);
@@ -8032,16 +8040,24 @@ __wlan_hdd_cfg80211_avoid_freq(struct wiphy *wiphy,
 	pld_get_wlan_unsafe_channel(qdf_ctx->dev, hdd_ctx->unsafe_channel_list,
 			&(hdd_ctx->unsafe_channel_count),
 			sizeof(hdd_ctx->unsafe_channel_list));
-
-	hdd_ctx->unsafe_channel_count = hdd_validate_avoid_freq_chanlist(
+	if (user_set_avoid_channel) {
+		hdd_ctx->unsafe_channel_count =
+					hdd_validate_avoid_freq_chanlist(
 								hdd_ctx,
 								channel_list);
+		unsafe_channel_count = hdd_ctx->unsafe_channel_count;
 
-	pld_set_wlan_unsafe_channel(qdf_ctx->dev, hdd_ctx->unsafe_channel_list,
-				    hdd_ctx->unsafe_channel_count);
+		pld_set_wlan_unsafe_channel(qdf_ctx->dev,
+					    hdd_ctx->unsafe_channel_list,
+					    hdd_ctx->unsafe_channel_count);
+	} else {
+		unsafe_channel_count = QDF_MIN(
+					(uint16_t)hdd_ctx->unsafe_channel_count,
+					(uint16_t)NUM_CHANNELS);
+	}
 
 	for (unsafe_channel_index = 0;
-	     unsafe_channel_index < hdd_ctx->unsafe_channel_count;
+	     unsafe_channel_index < unsafe_channel_count;
 	     unsafe_channel_index++) {
 		hdd_debug("Channel %d is not safe",
 			  hdd_ctx->unsafe_channel_list[unsafe_channel_index]);