sr: stop_acquisition callback: Return int.

hardware/alsa/alsa.c

@@ -379,11 +379,13 @@ static int hw_start_acquisition(int device_index, gpointer session_device_id)
 	return SR_OK;
 }
 
-static void hw_stop_acquisition(int device_index, gpointer session_device_id)
+static int hw_stop_acquisition(int device_index, gpointer session_device_id)
 {
 	/* Avoid compiler warnings. */
 	device_index = device_index;
 	session_device_id = session_device_id;
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin alsa_plugin_info = {

hardware/asix-sigma/asix-sigma.c

@@ -118,7 +118,7 @@ static const char *firmware_files[] = {
 	"asix-sigma-phasor.fw",	/* Frequency counter */
 };
 
-static void hw_stop_acquisition(int device_index, gpointer session_data);
+static int hw_stop_acquisition(int device_index, gpointer session_data);
 
 static int sigma_read(void *buf, size_t size, struct sigma *sigma)
 {
@@ -1362,20 +1362,25 @@ static int hw_start_acquisition(int device_index, gpointer session_data)
 	return SR_OK;
 }
 
-static void hw_stop_acquisition(int device_index, gpointer session_data)
+static int hw_stop_acquisition(int device_index, gpointer session_data)
 {
 	struct sr_device_instance *sdi;
 	struct sigma *sigma;
 	uint8_t modestatus;
 
-	if (!(sdi = sr_get_device_instance(device_instances, device_index)))
-		return;
-
-	sigma = sdi->priv;
-
 	/* Avoid compiler warnings. */
 	(void)session_data;
 
+	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
+		sr_err("asix: %s: sdi was NULL", __func__);
+		return SR_ERR_BUG;
+	}
+
+	if (!(sigma = sdi->priv)) {
+		sr_err("asix: %s: sdi->priv was NULL", __func__);
+		return SR_ERR_BUG;
+	}
+
 	/* Stop acquisition. */
 	sigma_set_register(WRITE_MODE, 0x11, sigma);
 
@@ -1387,15 +1392,16 @@ static void hw_stop_acquisition(int device_index, gpointer session_data)
 
 	/* Check if trigger has fired. */
 	modestatus = sigma_get_register(READ_MODE, sigma);
-	if (modestatus & 0x20) {
+	if (modestatus & 0x20)
 		sigma->state.triggerchunk = sigma->state.triggerpos / 512;
-
-	} else
+	else
 		sigma->state.triggerchunk = -1;
 
 	sigma->state.chunks_downloaded = 0;
 
 	sigma->state.state = SIGMA_DOWNLOAD;
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin asix_sigma_plugin_info = {

hardware/chronovu-la8/chronovu-la8.c

@@ -136,7 +136,7 @@ static int capabilities[] = {
 
 /* Function prototypes. */
 static int la8_close_usb_reset_sequencer(struct la8 *la8);
-static void hw_stop_acquisition(int device_index, gpointer session_data);
+static int hw_stop_acquisition(int device_index, gpointer session_data);
 static int la8_reset(struct la8 *la8);
 
 static void fill_supported_samplerates_if_needed(void)
@@ -1103,7 +1103,7 @@ static int hw_start_acquisition(int device_index, gpointer session_data)
 	return SR_OK;
 }
 
-static void hw_stop_acquisition(int device_index, gpointer session_data)
+static int hw_stop_acquisition(int device_index, gpointer session_data)
 {
 	struct sr_device_instance *sdi;
 	struct la8 *la8;
@@ -1113,18 +1113,20 @@ static void hw_stop_acquisition(int device_index, gpointer session_data)
 
 	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 		sr_err("la8: %s: sdi was NULL", __func__);
-		return;
+		return SR_ERR_BUG;
 	}
 
 	if (!(la8 = sdi->priv)) {
 		sr_err("la8: %s: sdi->priv was NULL", __func__);
-		return;
+		return SR_ERR_BUG;
 	}
 
 	/* Send end packet to the session bus. */
 	sr_dbg("la8: %s: sending SR_DF_END", __func__);
 	packet.type = SR_DF_END;
 	sr_session_bus(session_data, &packet);
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin chronovu_la8_plugin_info = {

hardware/demo/demo.c

@@ -134,7 +134,7 @@ static int default_pattern = PATTERN_SIGROK;
 static GThread *my_thread;
 static int thread_running;
 
-static void hw_stop_acquisition(int device_index, gpointer session_data);
+static int hw_stop_acquisition(int device_index, gpointer session_data);
 
 static int hw_init(const char *deviceinfo)
 {
@@ -476,7 +476,7 @@ static int hw_start_acquisition(int device_index, gpointer session_data)
 	return SR_OK;
 }
 
-static void hw_stop_acquisition(int device_index, gpointer session_data)
+static int hw_stop_acquisition(int device_index, gpointer session_data)
 {
 	/* Avoid compiler warnings. */
 	(void)device_index;
@@ -484,6 +484,8 @@ static void hw_stop_acquisition(int device_index, gpointer session_data)
 
 	/* Stop generate thread. */
 	thread_running = 0;
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin demo_plugin_info = {

hardware/link-mso19/link-mso19.c

@@ -816,7 +816,7 @@ static int hw_start_acquisition(int device_index, gpointer session_device_id)
 }
 
 /* FIXME */
-static void hw_stop_acquisition(int device_index, gpointer session_device_id)
+static int hw_stop_acquisition(int device_index, gpointer session_device_id)
 {
 	struct sr_datafeed_packet packet;
 
@@ -824,6 +824,8 @@ static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 
 	packet.type = SR_DF_END;
 	sr_session_bus(session_device_id, &packet);
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin link_mso19_plugin_info = {

hardware/openbench-logic-sniffer/ols.c

@@ -1010,7 +1010,7 @@ static int hw_start_acquisition(int device_index, gpointer session_data)
 	return SR_OK;
 }
 
-static void hw_stop_acquisition(int device_index, gpointer session_device_id)
+static int hw_stop_acquisition(int device_index, gpointer session_device_id)
 {
 	struct sr_datafeed_packet packet;
 
@@ -1019,6 +1019,8 @@ static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 
 	packet.type = SR_DF_END;
 	sr_session_bus(session_device_id, &packet);
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin ols_plugin_info = {

hardware/saleae-logic/saleae-logic.c

@@ -94,7 +94,7 @@ static libusb_context *usb_context = NULL;
 static int new_saleae_logic_firmware = 0;
 
 static int hw_set_configuration(int device_index, int capability, void *value);
-static void hw_stop_acquisition(int device_index, gpointer session_device_id);
+static int hw_stop_acquisition(int device_index, gpointer session_device_id);
 
 /**
  * Check the USB configuration to determine if this is a Saleae Logic.
@@ -856,7 +856,7 @@ static int hw_start_acquisition(int device_index, gpointer session_data)
 }
 
 /* This stops acquisition on ALL devices, ignoring device_index. */
-static void hw_stop_acquisition(int device_index, gpointer session_data)
+static int hw_stop_acquisition(int device_index, gpointer session_data)
 {
 	struct sr_datafeed_packet packet;
 
@@ -869,6 +869,8 @@ static void hw_stop_acquisition(int device_index, gpointer session_data)
 	receive_transfer(NULL);
 
 	/* TODO: Need to cancel and free any queued up transfers. */
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin saleae_logic_plugin_info = {

hardware/zeroplus-logic-cube/zeroplus.c

@@ -698,7 +698,7 @@ static int hw_start_acquisition(int device_index, gpointer session_data)
 }
 
 /* This stops acquisition on ALL devices, ignoring device_index. */
-static void hw_stop_acquisition(int device_index, gpointer session_device_id)
+static int hw_stop_acquisition(int device_index, gpointer session_device_id)
 {
 	struct sr_datafeed_packet packet;
 	struct sr_device_instance *sdi;
@@ -709,16 +709,18 @@ static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 
 	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 		sr_err("zp: %s: sdi was NULL", __func__);
-		return; /* FIXME */
+		return SR_ERR_BUG;
 	}
 
 	if (!(zp = sdi->priv)) {
 		sr_err("zp: %s: sdi->priv was NULL", __func__);
-		return; /* FIXME */
+		return SR_ERR_BUG;
 	}
 
 	analyzer_reset(zp->usb->devhdl);
 	/* TODO: Need to cancel and free any queued up transfers. */
+
+	return SR_OK;
 }
 
 SR_PRIV struct sr_device_plugin zeroplus_logic_cube_plugin_info = {

sigrok.h

@@ -354,7 +354,7 @@ struct sr_device_plugin {
 	int *(*get_capabilities) (void);
 	int (*set_configuration) (int device_index, int capability, void *value);
 	int (*start_acquisition) (int device_index, gpointer session_device_id);
-	void (*stop_acquisition) (int device_index, gpointer session_device_id);
+	int (*stop_acquisition) (int device_index, gpointer session_device_id);
 };
 
 struct sr_session {