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From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: [PATCH] media: ivtv: don't call s_stream(0) if not streaming
Date: Thu, 2 Nov 2023 15:04:05 +0100	[thread overview]
Message-ID: <a6242ba9-9ee5-4bd6-92da-10fdd40513e6@xs4all.nl> (raw)

Recently a WARN_ON was added in v4l2-subdev.c to warn if s_stream was called
unnecessarily. The ivtv driver hits this once when it is loaded for the first
time. Add a bool to avoid this warning.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
diff --git a/drivers/media/pci/ivtv/ivtv-driver.h b/drivers/media/pci/ivtv/ivtv-driver.h
index ce3a7ca51736..e9871d648db7 100644
--- a/drivers/media/pci/ivtv/ivtv-driver.h
+++ b/drivers/media/pci/ivtv/ivtv-driver.h
@@ -619,6 +619,7 @@ struct ivtv {
 	u32 hw_flags;			/* hardware description of the board */
 	v4l2_std_id tuner_std;		/* the norm of the card's tuner (fixed) */
 	struct v4l2_subdev *sd_video;	/* controlling video decoder subdev */
+	bool sd_video_is_streaming;
 	struct v4l2_subdev *sd_audio;	/* controlling audio subdev */
 	struct v4l2_subdev *sd_muxer;	/* controlling audio muxer subdev */
 	resource_size_t base_addr;      /* PCI resource base address */
diff --git a/drivers/media/pci/ivtv/ivtv-streams.c b/drivers/media/pci/ivtv/ivtv-streams.c
index 13d7d55e6594..af9e6235c74d 100644
--- a/drivers/media/pci/ivtv/ivtv-streams.c
+++ b/drivers/media/pci/ivtv/ivtv-streams.c
@@ -623,10 +623,12 @@ int ivtv_start_v4l2_encode_stream(struct ivtv_stream *s)
 		/* Avoid tinny audio problem - ensure audio clocks are going */
 		v4l2_subdev_call(itv->sd_audio, audio, s_stream, 1);
 		/* Avoid unpredictable PCI bus hang - disable video clocks */
-		v4l2_subdev_call(itv->sd_video, video, s_stream, 0);
+		if (itv->sd_video_is_streaming)
+			v4l2_subdev_call(itv->sd_video, video, s_stream, 0);
 		ivtv_msleep_timeout(300, 0);
 		ivtv_vapi(itv, CX2341X_ENC_INITIALIZE_INPUT, 0);
 		v4l2_subdev_call(itv->sd_video, video, s_stream, 1);
+		itv->sd_video_is_streaming = true;
 	}

 	/* begin_capture */

                 reply	other threads:[~2023-11-02 14:04 UTC|newest]

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