X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=instance.c;h=5264bd0bd3a54d72f8503e926931f542ab310d96;hp=e470bd14e70ab0a1f0085e1edb20cea3a112e956;hb=HEAD;hpb=f8d25d1f7256a4515b7fb972e3302be2138c8ee1

diff --git a/instance.c b/instance.c
index e470bd1..067e98d 100644
--- a/instance.c
+++ b/instance.c
@@ -30,11 +30,6 @@
 
 extern SRD_PRIV GSList *sessions;
 
-static void srd_inst_join_decode_thread(struct srd_decoder_inst *di);
-static void srd_inst_reset_state(struct srd_decoder_inst *di);
-SRD_PRIV void oldpins_array_seed(struct srd_decoder_inst *di);
-SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di);
-
 /** @endcond */
 
 /**
@@ -51,6 +46,37 @@ SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di);
  * @{
  */
 
+static void oldpins_array_seed(struct srd_decoder_inst *di)
+{
+	size_t count;
+	GArray *arr;
+
+	if (!di)
+		return;
+	if (di->old_pins_array)
+		return;
+
+	count = di->dec_num_channels;
+	arr = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t), count);
+	g_array_set_size(arr, count);
+	if (arr->data)
+		memset(arr->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0, count);
+	di->old_pins_array = arr;
+}
+
+static void oldpins_array_free(struct srd_decoder_inst *di)
+{
+	if (!di)
+		return;
+	if (!di->old_pins_array)
+		return;
+
+	srd_dbg("%s: Releasing initial pin state.", di->inst_id);
+
+	g_array_free(di->old_pins_array, TRUE);
+	di->old_pins_array = NULL;
+}
+
 /**
  * Set one or more options in a decoder instance.
  *
@@ -115,6 +141,7 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
 	Py_DECREF(py_di_options);
 	py_di_options = PyDict_New();
 	PyObject_SetAttrString(di->py_inst, "options", py_di_options);
+	Py_DECREF(py_di_options);
 
 	for (l = di->decoder->options; l; l = l->next) {
 		sdo = l->data;
@@ -140,7 +167,7 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
 			}
 		} else if (g_variant_is_of_type(value, G_VARIANT_TYPE_INT64)) {
 			val_int = g_variant_get_int64(value);
-			if (!(py_optval = PyLong_FromLong(val_int))) {
+			if (!(py_optval = PyLong_FromLongLong(val_int))) {
 				/* ValueError Exception */
 				PyErr_Clear();
 				srd_err("Option '%s' has invalid integer value.", sdo->id);
@@ -156,10 +183,13 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
 				goto err_out;
 			}
 		}
-		if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1)
+		if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1) {
+			Py_XDECREF(py_optval);
 			goto err_out;
+		}
 		/* Not harmful even if we used the default. */
 		g_hash_table_remove(options, sdo->id);
+		Py_XDECREF(py_optval);
 	}
 	if (g_hash_table_size(options) != 0)
 		srd_warn("Unknown options specified for '%s'", di->inst_id);
@@ -167,7 +197,6 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
 	ret = SRD_OK;
 
 err_out:
-	Py_XDECREF(py_optval);
 	if (PyErr_Occurred()) {
 		srd_exception_catch("Stray exception in srd_inst_option_set()");
 		ret = SRD_ERR_PYTHON;
@@ -177,7 +206,7 @@ err_out:
 	return ret;
 }
 
-/* Helper GComparefunc for g_slist_find_custom() in srd_inst_channel_set_all() */
+/* Helper GComparefunc for g_slist_find_custom() in srd_inst_channel_set_all(). */
 static gint compare_channel_id(const struct srd_channel *pdch,
 			const char *channel_id)
 {
@@ -223,7 +252,7 @@ SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di,
 		return SRD_ERR_ARG;
 	}
 
-	new_channelmap = g_malloc(sizeof(int) * di->dec_num_channels);
+	new_channelmap = g_malloc0(sizeof(int) * di->dec_num_channels);
 
 	/*
 	 * For now, map all indexes to channel -1 (can be overridden later).
@@ -263,11 +292,11 @@ SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di,
 	srd_dbg("Final channel map:");
 	num_required_channels = g_slist_length(di->decoder->channels);
 	for (i = 0; i < di->dec_num_channels; i++) {
-		GSList *l = g_slist_nth(di->decoder->channels, i);
-		if (!l)
-			l = g_slist_nth(di->decoder->opt_channels,
+		GSList *ll = g_slist_nth(di->decoder->channels, i);
+		if (!ll)
+			ll = g_slist_nth(di->decoder->opt_channels,
 				i - num_required_channels);
-		pdch = l->data;
+		pdch = ll->data;
 		srd_dbg(" - PD ch idx %d (%s) = input data ch idx %d (%s)", i,
 			pdch->id, new_channelmap[i],
 			(i < num_required_channels) ? "required" : "optional");
@@ -280,6 +309,7 @@ SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di,
 		pdch = g_slist_nth(di->decoder->channels, i)->data;
 		srd_err("Required channel '%s' (index %d) was not specified.",
 			pdch->id, i);
+		g_free(new_channelmap);
 		return SRD_ERR;
 	}
 
@@ -293,6 +323,7 @@ SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di,
  * Create a new protocol decoder instance.
  *
  * @param sess The session holding the protocol decoder instance.
+ *             Must not be NULL.
  * @param decoder_id Decoder 'id' field.
  * @param options GHashtable of options which override the defaults set in
  *                the decoder class. May be NULL.
@@ -312,12 +343,9 @@ SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess,
 	PyGILState_STATE gstate;
 
 	i = 1;
-	srd_dbg("Creating new %s instance.", decoder_id);
 
-	if (session_is_valid(sess) != SRD_OK) {
-		srd_err("Invalid session.");
+	if (!sess)
 		return NULL;
-	}
 
 	if (!(dec = srd_decoder_get_by_id(decoder_id))) {
 		srd_err("Protocol decoder %s not found.", decoder_id);
@@ -398,6 +426,8 @@ SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess,
 	di->got_new_samples = FALSE;
 	di->handled_all_samples = FALSE;
 	di->want_wait_terminate = FALSE;
+	di->communicate_eof = FALSE;
+	di->decoder_state = SRD_OK;
 
 	/*
 	 * Strictly speaking initialization of statically allocated
@@ -411,7 +441,7 @@ SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess,
 
 	/* Instance takes input from a frontend by default. */
 	sess->di_list = g_slist_append(sess->di_list, di);
-	srd_dbg("Created new %s instance with ID %s.", decoder_id, di->inst_id);
+	srd_dbg("Creating new %s instance %s.", decoder_id, di->inst_id);
 
 	return di;
 }
@@ -459,9 +489,7 @@ static void srd_inst_reset_state(struct srd_decoder_inst *di)
 
 	srd_dbg("%s: Resetting decoder state.", di->inst_id);
 
-	/*
-	 * Reset internal state of the decoder.
-	 */
+	/* Reset internal state of the decoder. */
 	condition_list_free(di);
 	match_array_free(di);
 	di->abs_start_samplenum = 0;
@@ -473,6 +501,8 @@ static void srd_inst_reset_state(struct srd_decoder_inst *di)
 	di->got_new_samples = FALSE;
 	di->handled_all_samples = FALSE;
 	di->want_wait_terminate = FALSE;
+	di->communicate_eof = FALSE;
+	di->decoder_state = SRD_OK;
 	/* Conditions and mutex got reset after joining the thread. */
 }
 
@@ -480,6 +510,7 @@ static void srd_inst_reset_state(struct srd_decoder_inst *di)
  * Stack a decoder instance on top of another.
  *
  * @param sess The session holding the protocol decoder instances.
+ *             Must not be NULL.
  * @param di_bottom The instance on top of which di_top will be stacked.
  * @param di_top The instance to go on top.
  *
@@ -491,10 +522,8 @@ SRD_API int srd_inst_stack(struct srd_session *sess,
 		struct srd_decoder_inst *di_bottom,
 		struct srd_decoder_inst *di_top)
 {
-	if (session_is_valid(sess) != SRD_OK) {
-		srd_err("Invalid session.");
+	if (!sess)
 		return SRD_ERR_ARG;
-	}
 
 	if (!di_bottom || !di_top) {
 		srd_err("Invalid from/to instance pair.");
@@ -506,10 +535,31 @@ SRD_API int srd_inst_stack(struct srd_session *sess,
 		sess->di_list = g_slist_remove(sess->di_list, di_top);
 	}
 
+	/*
+	 * Check if there's at least one matching input/output pair
+	 * for the stacked PDs. We warn if that's not the case, but it's
+	 * not a hard error for the time being.
+	 */
+	gboolean at_least_one_match = FALSE;
+	for (GSList *out = di_bottom->decoder->outputs; out; out = out->next) {
+		const char *o = out->data;
+		for (GSList *in = di_top->decoder->inputs; in; in = in->next) {
+			const char *i = in->data;
+			if (!strcmp(o, i)) {
+				at_least_one_match = TRUE;
+				break;
+			}
+		}
+	}
+
+	if (!at_least_one_match)
+		srd_warn("No matching in-/output when stacking %s onto %s.",
+			di_top->inst_id, di_bottom->inst_id);
+
 	/* Stack on top of source di. */
 	di_bottom->next_di = g_slist_append(di_bottom->next_di, di_top);
 
-	srd_dbg("Stacked %s onto %s.", di_top->inst_id, di_bottom->inst_id);
+	srd_dbg("Stacking %s onto %s.", di_top->inst_id, di_bottom->inst_id);
 
 	return SRD_OK;
 }
@@ -553,6 +603,7 @@ static struct srd_decoder_inst *srd_inst_find_by_id_stack(const char *inst_id,
  * given session.
  *
  * @param sess The session holding the protocol decoder instance.
+ *             Must not be NULL.
  * @param inst_id The instance ID to be found.
  *
  * @return Pointer to struct srd_decoder_inst, or NULL if not found.
@@ -565,10 +616,8 @@ SRD_API struct srd_decoder_inst *srd_inst_find_by_id(struct srd_session *sess,
 	GSList *l;
 	struct srd_decoder_inst *tmp, *di;
 
-	if (session_is_valid(sess) != SRD_OK) {
-		srd_err("Invalid session.");
+	if (!sess)
 		return NULL;
-	}
 
 	di = NULL;
 	for (l = sess->di_list; l; l = l->next) {
@@ -580,64 +629,6 @@ SRD_API struct srd_decoder_inst *srd_inst_find_by_id(struct srd_session *sess,
 	return di;
 }
 
-static struct srd_decoder_inst *srd_sess_inst_find_by_obj(
-		struct srd_session *sess, const GSList *stack,
-		const PyObject *obj)
-{
-	const GSList *l;
-	struct srd_decoder_inst *tmp, *di;
-
-	if (session_is_valid(sess) != SRD_OK) {
-		srd_err("Invalid session.");
-		return NULL;
-	}
-
-	di = NULL;
-	for (l = stack ? stack : sess->di_list; di == NULL && l != NULL; l = l->next) {
-		tmp = l->data;
-		if (tmp->py_inst == obj)
-			di = tmp;
-		else if (tmp->next_di)
-			di = srd_sess_inst_find_by_obj(sess, tmp->next_di, obj);
-	}
-
-	return di;
-}
-
-/**
- * Find a decoder instance by its Python object.
- *
- * I.e. find that instance's instantiation of the sigrokdecode.Decoder class.
- * This will recurse to find the instance anywhere in the stack tree of all
- * sessions.
- *
- * @param stack Pointer to a GSList of struct srd_decoder_inst, indicating the
- *              stack to search. To start searching at the bottom level of
- *              decoder instances, pass NULL.
- * @param obj The Python class instantiation.
- *
- * @return Pointer to struct srd_decoder_inst, or NULL if not found.
- *
- * @private
- *
- * @since 0.1.0
- */
-SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(const GSList *stack,
-		const PyObject *obj)
-{
-	struct srd_decoder_inst *di;
-	struct srd_session *sess;
-	GSList *l;
-
-	di = NULL;
-	for (l = sessions; di == NULL && l != NULL; l = l->next) {
-		sess = l->data;
-		di = srd_sess_inst_find_by_obj(sess, stack, obj);
-	}
-
-	return di;
-}
-
 /**
  * Set the list of initial (assumed) pin values.
  *
@@ -687,50 +678,16 @@ SRD_API int srd_inst_initial_pins_set_all(struct srd_decoder_inst *di, GArray *i
 	return SRD_OK;
 }
 
-/** @private */
-SRD_PRIV void oldpins_array_seed(struct srd_decoder_inst *di)
-{
-	size_t count;
-	GArray *arr;
-
-	if (!di)
-		return;
-	if (di->old_pins_array)
-		return;
-
-	srd_dbg("%s: Seeding old pins, %s().", di->inst_id, __func__);
-	count = di->dec_num_channels;
-	arr = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t), count);
-	g_array_set_size(arr, count);
-	memset(arr->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0, count);
-	di->old_pins_array = arr;
-}
-
-/** @private */
-SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di)
-{
-	if (!di)
-		return;
-	if (!di->old_pins_array)
-		return;
-
-	srd_dbg("%s: Releasing initial pin state.", di->inst_id);
-
-	g_array_free(di->old_pins_array, TRUE);
-	di->old_pins_array = NULL;
-}
-
 /** @private */
 SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di)
 {
-	PyObject *py_res;
+	PyObject *py_res, *py_samplenum;
 	GSList *l;
 	struct srd_decoder_inst *next_di;
 	int ret;
 	PyGILState_STATE gstate;
 
-	srd_dbg("Calling start() method on protocol decoder instance %s.",
-			di->inst_id);
+	srd_dbg("Calling start() of instance %s.", di->inst_id);
 
 	gstate = PyGILState_Ensure();
 
@@ -741,10 +698,12 @@ SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di)
 		PyGILState_Release(gstate);
 		return SRD_ERR_PYTHON;
 	}
-	Py_DecRef(py_res);
+	Py_DECREF(py_res);
 
 	/* Set self.samplenum to 0. */
-	PyObject_SetAttrString(di->py_inst, "samplenum", PyLong_FromLong(0));
+	py_samplenum = PyLong_FromUnsignedLongLong(0);
+	PyObject_SetAttrString(di->py_inst, "samplenum", py_samplenum);
+	Py_DECREF(py_samplenum);
 
 	/* Set self.matched to None. */
 	PyObject_SetAttrString(di->py_inst, "matched", Py_None);
@@ -777,7 +736,8 @@ SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di)
  *
  * @private
  */
-static gboolean sample_matches(uint8_t old_sample, uint8_t sample, struct srd_term *term)
+__attribute__((always_inline))
+static inline gboolean sample_matches(uint8_t old_sample, uint8_t sample, struct srd_term *term)
 {
 	/* Caller ensures term != NULL. */
 
@@ -843,6 +803,7 @@ SRD_PRIV void condition_list_free(struct srd_decoder_inst *di)
 			g_slist_free_full(ll, g_free);
 	}
 
+	g_slist_free(di->condition_list);
 	di->condition_list = NULL;
 }
 
@@ -873,6 +834,8 @@ static void update_old_pins_array(struct srd_decoder_inst *di,
 
 	oldpins_array_seed(di);
 	for (i = 0; i < di->dec_num_channels; i++) {
+		if (di->dec_channelmap[i] == -1)
+			continue; /* Ignore unused optional channels. */
 		byte_offset = di->dec_channelmap[i] / 8;
 		bit_offset = di->dec_channelmap[i] % 8;
 		sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
@@ -895,6 +858,8 @@ static void update_old_pins_array_initial_pins(struct srd_decoder_inst *di)
 	for (i = 0; i < di->dec_num_channels; i++) {
 		if (di->old_pins_array->data[i] != SRD_INITIAL_PIN_SAME_AS_SAMPLE0)
 			continue;
+		if (di->dec_channelmap[i] == -1)
+			continue; /* Ignore unused optional channels. */
 		byte_offset = di->dec_channelmap[i] / 8;
 		bit_offset = di->dec_channelmap[i] % 8;
 		sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
@@ -932,6 +897,8 @@ static gboolean all_terms_match(const struct srd_decoder_inst *di,
 
 	for (l = cond; l; l = l->next) {
 		term = l->data;
+		if (term->type == SRD_TERM_ALWAYS_FALSE)
+			return FALSE;
 		if (!term_matches(di, term, sample_pos))
 			return FALSE;
 	}
@@ -1088,10 +1055,24 @@ static gpointer di_thread(gpointer data)
 	 * Call self.decode(). Only returns if the PD throws an exception.
 	 * "Regular" termination of the decode() method is not expected.
 	 */
-	Py_IncRef(di->py_inst);
-	srd_dbg("%s: Calling decode() method.", di->inst_id);
+	Py_INCREF(di->py_inst);
+	srd_dbg("%s: Calling decode().", di->inst_id);
 	py_res = PyObject_CallMethod(di->py_inst, "decode", NULL);
-	srd_dbg("%s: decode() method terminated.", di->inst_id);
+	srd_dbg("%s: decode() terminated.", di->inst_id);
+
+	/*
+	 * Termination with an EOFError exception is accepted to simplify
+	 * the implementation of decoders and for backwards compatibility.
+	 */
+	if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_EOFError)) {
+		srd_dbg("%s: ignoring EOFError during decode() execution.",
+			di->inst_id);
+		PyErr_Clear();
+		if (!py_res)
+			py_res = Py_None;
+	}
+	if (!py_res)
+		di->decoder_state = SRD_ERR;
 
 	/*
 	 * Make sure to unblock potentially pending srd_inst_decode()
@@ -1141,7 +1122,7 @@ static gpointer di_thread(gpointer data)
 	 * decode() will re-start another thread transparently.
 	 */
 	srd_dbg("%s: decode() terminated (req %d).", di->inst_id, wanted_term);
-	Py_DecRef(py_res);
+	Py_DECREF(py_res);
 	PyErr_Clear();
 
 	PyGILState_Release(gstate);
@@ -1266,6 +1247,108 @@ SRD_PRIV int srd_inst_decode(struct srd_decoder_inst *di,
 		g_cond_wait(&di->handled_all_samples_cond, &di->data_mutex);
 	g_mutex_unlock(&di->data_mutex);
 
+	/* Flush all PDs in the stack that can be flushed */
+	srd_inst_flush(di);
+
+	if (di->want_wait_terminate)
+		return SRD_ERR_TERM_REQ;
+
+	return SRD_OK;
+}
+
+
+/**
+ * Flush all data that is pending, bottom decoder first up to the top of the stack.
+ *
+ * @param di The decoder instance to call. Must not be NULL.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @private
+ */
+SRD_PRIV int srd_inst_flush(struct srd_decoder_inst *di)
+{
+	PyGILState_STATE gstate;
+	PyObject *py_ret;
+	GSList *l;
+	int ret;
+
+	if (!di)
+		return SRD_ERR_ARG;
+
+	gstate = PyGILState_Ensure();
+	if (PyObject_HasAttrString(di->py_inst, "flush")) {
+		srd_dbg("Calling flush() of instance %s", di->inst_id);
+		py_ret = PyObject_CallMethod(di->py_inst, "flush", NULL);
+		Py_XDECREF(py_ret);
+	}
+	PyGILState_Release(gstate);
+
+	/* Pass the "flush" request to all stacked decoders. */
+	for (l = di->next_di; l; l = l->next) {
+		ret = srd_inst_flush(l->data);
+		if (ret != SRD_OK)
+			return ret;
+	}
+
+	return di->decoder_state;
+}
+
+/**
+ * Communicate the end of the stream of sample data to a decoder instance.
+ *
+ * @param[in] di The decoder instance to call. Must not be NULL.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @private
+ */
+SRD_PRIV int srd_inst_send_eof(struct srd_decoder_inst *di)
+{
+	GSList *l;
+	int ret;
+
+	if (!di)
+		return SRD_ERR_ARG;
+
+	/*
+	 * Send EOF to the caller specified decoder instance. Only
+	 * communicate EOF to currently executing decoders. Never
+	 * started or previously finished is perfectly acceptable.
+	 */
+	srd_dbg("End of sample data: instance %s.", di->inst_id);
+	if (!di->thread_handle) {
+		srd_dbg("No worker thread, nothing to do.");
+		return SRD_OK;
+	}
+
+	/* Signal the thread about the EOF condition. */
+	g_mutex_lock(&di->data_mutex);
+	di->inbuf = NULL;
+	di->inbuflen = 0;
+	di->got_new_samples = TRUE;
+	di->handled_all_samples = FALSE;
+	di->want_wait_terminate = TRUE;
+	di->communicate_eof = TRUE;
+	g_cond_signal(&di->got_new_samples_cond);
+	g_mutex_unlock(&di->data_mutex);
+
+	/* Only return from here when the condition was handled. */
+	g_mutex_lock(&di->data_mutex);
+	while (!di->handled_all_samples && !di->want_wait_terminate)
+		g_cond_wait(&di->handled_all_samples_cond, &di->data_mutex);
+	g_mutex_unlock(&di->data_mutex);
+
+	/* Flush the decoder instance which handled EOF. */
+	srd_inst_flush(di);
+
+	/* Pass EOF to all stacked decoders. */
+	for (l = di->next_di; l; l = l->next) {
+		ret = srd_inst_send_eof(l->data);
+		if (ret != SRD_OK)
+			return ret;
+	}
+
 	return SRD_OK;
 }
 
@@ -1282,7 +1365,9 @@ SRD_PRIV int srd_inst_decode(struct srd_decoder_inst *di,
  * calls like they would for newly constructed decoder stacks.
  *
  * @param di The decoder instance to call. Must not be NULL.
+ *
  * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
  * @private
  */
 SRD_PRIV int srd_inst_terminate_reset(struct srd_decoder_inst *di)
@@ -1315,22 +1400,20 @@ SRD_PRIV int srd_inst_terminate_reset(struct srd_decoder_inst *di)
 	 */
 	gstate = PyGILState_Ensure();
 	if (PyObject_HasAttrString(di->py_inst, "reset")) {
-		srd_dbg("Calling .reset() of instance %s", di->inst_id);
+		srd_dbg("Calling reset() of instance %s", di->inst_id);
 		py_ret = PyObject_CallMethod(di->py_inst, "reset", NULL);
 		Py_XDECREF(py_ret);
 	}
 	PyGILState_Release(gstate);
 
-	/*
-	 * Pass the "restart" request to all stacked decoders.
-	 */
+	/* Pass the "restart" request to all stacked decoders. */
 	for (l = di->next_di; l; l = l->next) {
 		ret = srd_inst_terminate_reset(l->data);
 		if (ret != SRD_OK)
 			return ret;
 	}
 
-	return SRD_OK;
+	return di->decoder_state;
 }
 
 /** @private */
@@ -1340,14 +1423,14 @@ SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
 	struct srd_pd_output *pdo;
 	PyGILState_STATE gstate;
 
-	srd_dbg("Freeing instance %s", di->inst_id);
+	srd_dbg("Freeing instance %s.", di->inst_id);
 
 	srd_inst_join_decode_thread(di);
 
 	srd_inst_reset_state(di);
 
 	gstate = PyGILState_Ensure();
-	Py_DecRef(di->py_inst);
+	Py_DECREF(di->py_inst);
 	PyGILState_Release(gstate);
 
 	g_free(di->inst_id);
@@ -1366,10 +1449,8 @@ SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
 /** @private */
 SRD_PRIV void srd_inst_free_all(struct srd_session *sess)
 {
-	if (session_is_valid(sess) != SRD_OK) {
-		srd_err("Invalid session.");
+	if (!sess)
 		return;
-	}
 
 	g_slist_free_full(sess->di_list, (GDestroyNotify)srd_inst_free);
 }