linux-kernel - [PATCH 05/12] slimbus: stream: add checks for invalid unprepare/disable usage

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Date:   Fri, 18 Nov 2022 06:52:39 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 05/12] slimbus: stream: add checks for invalid unprepare/disable usage

From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

slim_disable_stream() and slim_stream_unprepare() are exported, so add
sanity checks preventing unmatched/invalid calls.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/slimbus/stream.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/slimbus/stream.c b/drivers/slimbus/stream.c
index 7e9c818e66c1..1d6b38657917 100644
--- a/drivers/slimbus/stream.c
+++ b/drivers/slimbus/stream.c
@@ -414,6 +414,9 @@ int slim_stream_disable(struct slim_stream_runtime *stream)
 	struct slim_controller *ctrl = stream->dev->ctrl;
 	int ret, i;
 
+	if (!stream->ports || !stream->num_ports)
+		return -EINVAL;
+
 	if (ctrl->disable_stream)
 		ctrl->disable_stream(stream);
 
@@ -445,6 +448,9 @@ int slim_stream_unprepare(struct slim_stream_runtime *stream)
 {
 	int i;
 
+	if (!stream->ports || !stream->num_ports)
+		return -EINVAL;
+
 	for (i = 0; i < stream->num_ports; i++)
 		slim_disconnect_port(stream, &stream->ports[i]);
 
-- 
2.25.1