qcacmn: Clean up asserts in Spectral module - Part 1

Clean up null pointer asserts by returning the error status to the
caller in the below spectral module files
1.spectral/core/spectral_common.c
2.target_if/spectral/target_if_spectral.h
3.target_if/spectral/target_if_spectral.c

Change-Id: Ib8d49c06928379768fb41e34d721bd3840e86330
CRs-Fixed: 3587512

spectral/core/spectral_common.c

@@ -53,7 +53,10 @@ spectral_get_vdev(struct wlan_objmgr_pdev *pdev, uint8_t vdev_id)
 {
 	struct wlan_objmgr_vdev *vdev = NULL;
 
-	qdf_assert_always(pdev);
+	if (!pdev) {
+		spectral_err("pdev is null");
+		return NULL;
+	}
 
 	if (vdev_id == WLAN_INVALID_VDEV_ID)
 		vdev = wlan_objmgr_pdev_get_first_vdev(pdev, WLAN_SPECTRAL_ID);

target_if/spectral/target_if_spectral.c

@@ -430,9 +430,15 @@ target_if_spectral_get_vdev(struct target_if_spectral *spectral,
 	struct wlan_objmgr_pdev *pdev = NULL;
 	struct wlan_objmgr_vdev *first_vdev = NULL;
 
-	qdf_assert_always(spectral);
+	if (!spectral) {
+		spectral_err("spectral variable in null.");
+		return NULL;
+	}
 	pdev = spectral->pdev_obj;
-	qdf_assert_always(pdev);
+	if (!pdev) {
+		spectral_err("pdev variable in null.");
+		return NULL;
+	}
 
 	if (smode >= SPECTRAL_SCAN_MODE_MAX) {
 		spectral_err("Invalid Spectral mode %u", smode);
@@ -488,13 +494,14 @@ target_if_send_vdev_spectral_configure_cmd(struct target_if_spectral *spectral,
 	struct wlan_objmgr_vdev *vdev = NULL;
 	struct target_if_psoc_spectral *psoc_spectral;
 
-	qdf_assert_always(spectral);
+	if (!spectral || !param || !(spectral->pdev_obj)) {
-	qdf_assert_always(param);
+		spectral_err("null params: spectral %pK, spectral_config %pK, pdev: %pK.",
+			     spectral, param, pdev);
+		return qdf_status_to_os_return(QDF_STATUS_E_NULL_VALUE);
+	}
 
 	pdev = spectral->pdev_obj;
 
-	qdf_assert_always(pdev);
-
 	psoc = wlan_pdev_get_psoc(pdev);
 	if (!psoc) {
 		spectral_err("psoc is null");
@@ -571,11 +578,17 @@ target_if_send_vdev_spectral_enable_cmd(struct target_if_spectral *spectral,
 	struct wlan_objmgr_vdev *vdev = NULL;
 	struct target_if_psoc_spectral *psoc_spectral;
 
-	qdf_assert_always(spectral);
+	if (!spectral) {
+		spectral_err("spectral is null");
+		return qdf_status_to_os_return(QDF_STATUS_E_NULL_VALUE);
+	}
 
 	pdev = spectral->pdev_obj;
 
-	qdf_assert_always(pdev);
+	if (!pdev) {
+		spectral_err("pdev is null");
+		return qdf_status_to_os_return(QDF_STATUS_E_NULL_VALUE);
+	}
 
 	psoc = wlan_pdev_get_psoc(pdev);
 	if (!psoc) {
@@ -1803,7 +1816,11 @@ target_if_spectral_get_extension_channel(void *arg,
 	struct wlan_objmgr_vdev *vdev = NULL;
 	uint16_t sec20chan_freq = 0;
 
-	qdf_assert_always(arg);
+	if (!arg) {
+		spectral_err("Null argument.");
+		return 0;
+	}
+
 	spectral = (struct target_if_spectral *)arg;
 
 	if (smode >= SPECTRAL_SCAN_MODE_MAX) {
@@ -1846,7 +1863,11 @@ target_if_spectral_get_current_channel(void *arg, enum spectral_scan_mode smode)
 	int16_t chan_freq = 0;
 	struct wlan_objmgr_vdev *vdev = NULL;
 
-	qdf_assert_always(arg);
+	if (!arg) {
+		spectral_err("Null argument.");
+		return 0;
+	}
+
 	spectral = (struct target_if_spectral *)arg;
 
 	if (smode >= SPECTRAL_SCAN_MODE_MAX) {
@@ -2251,7 +2272,10 @@ target_if_populate_supported_sscan_bws_be(struct target_if_spectral *spectral)
 	struct spectral_supported_bws *supported_bws;
 	QDF_STATUS status;
 
-	qdf_assert_always(spectral);
+	if (!spectral) {
+		spectral_err("spectral variable is null");
+		return QDF_STATUS_E_NULL_VALUE;
+	}
 
 	/* 20MHz */
 	op_bw = CH_WIDTH_20MHZ;

target_if/spectral/target_if_spectral.h

@@ -2430,7 +2430,8 @@ clamp_fft_bin_value(uint16_t fft_bin_value, uint16_t pwr_format)
 		break;
 
 	default:
-		qdf_assert_always(0);
+		spectral_err_rl("Invalid pwr format: %d.", pwr_format);
+		return 0;
 	}
 
 	return clamped_fft_bin_value;