linux-kernel - [PATCH 5.15 34/76] ALSA: usb-audio: Avoid superfluous endpoint setup

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Message-ID: <20240313164223.615640-35-sashal@kernel.org>
Date: Wed, 13 Mar 2024 12:41:41 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Takashi Iwai <tiwai@...e.de>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 34/76] ALSA: usb-audio: Avoid superfluous endpoint setup

From: Takashi Iwai <tiwai@...e.de>

[ Upstream commit 1045f5f1ff0751423aeb65648e5e1abd7a7a8672 ]

After splitting to snd_usb_endpoint_set_params() and *_prepare(), the
skip of each function should be checked with different flags, while we
still use ep->need_setup as the single one.  Introduce
ep->need_prepare for indicating the need of prepare, and also add the
missing check of ep->need_setup at the set_params.

Fixes: 2be79d586454 ("ALSA: usb-audio: Split endpoint setups for hw_params and prepare (take#2)")
Link: https://lore.kernel.org/r/20221009104212.18877-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Stable-dep-of: 7822baa844a8 ("ALSA: usb-audio: add quirk for RODE NT-USB+")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/usb/card.h     |  3 ++-
 sound/usb/endpoint.c | 17 ++++++++++++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/sound/usb/card.h b/sound/usb/card.h
index ca75f2206170f..40061550105ac 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -129,7 +129,8 @@ struct snd_usb_endpoint {
 					   in a stream */
 	bool implicit_fb_sync;		/* syncs with implicit feedback */
 	bool lowlatency_playback;	/* low-latency playback mode */
-	bool need_setup;		/* (re-)need for configure? */
+	bool need_setup;		/* (re-)need for hw_params? */
+	bool need_prepare;		/* (re-)need for prepare? */
 
 	/* for hw constraints */
 	const struct audioformat *cur_audiofmt;
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 80ead3db4d1c7..cf48d7ccc496e 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -829,6 +829,7 @@ snd_usb_endpoint_open(struct snd_usb_audio *chip,
 
 		ep->implicit_fb_sync = fp->implicit_fb;
 		ep->need_setup = true;
+		ep->need_prepare = true;
 
 		usb_audio_dbg(chip, "  channels=%d, rate=%d, format=%s, period_bytes=%d, periods=%d, implicit_fb=%d\n",
 			      ep->cur_channels, ep->cur_rate,
@@ -954,7 +955,7 @@ void snd_usb_endpoint_close(struct snd_usb_audio *chip,
 /* Prepare for suspening EP, called from the main suspend handler */
 void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep)
 {
-	ep->need_setup = true;
+	ep->need_prepare = true;
 	if (ep->iface_ref)
 		ep->iface_ref->need_setup = true;
 	if (ep->clock_ref)
@@ -1337,9 +1338,12 @@ int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
 				struct snd_usb_endpoint *ep)
 {
 	const struct audioformat *fmt = ep->cur_audiofmt;
-	int err;
+	int err = 0;
 
 	mutex_lock(&chip->mutex);
+	if (!ep->need_setup)
+		goto unlock;
+
 	/* release old buffers, if any */
 	err = release_urbs(ep, false);
 	if (err < 0)
@@ -1388,8 +1392,11 @@ int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
 	ep->curframesize = ep->curpacksize / ep->cur_frame_bytes;
 
 	err = update_clock_ref_rate(chip, ep);
-	if (err >= 0)
+	if (err >= 0) {
+		ep->need_setup = false;
 		err = 0;
+	}
+
  unlock:
 	mutex_unlock(&chip->mutex);
 	return err;
@@ -1439,7 +1446,7 @@ int snd_usb_endpoint_prepare(struct snd_usb_audio *chip,
 	mutex_lock(&chip->mutex);
 	if (WARN_ON(!ep->iface_ref))
 		goto unlock;
-	if (!ep->need_setup)
+	if (!ep->need_prepare)
 		goto unlock;
 
 	/* If the interface has been already set up, just set EP parameters */
@@ -1493,7 +1500,7 @@ int snd_usb_endpoint_prepare(struct snd_usb_audio *chip,
 	ep->iface_ref->need_setup = false;
 
  done:
-	ep->need_setup = false;
+	ep->need_prepare = false;
 	err = 1;
 
 unlock:
-- 
2.43.0