linux-kernel - [PATCH AUTOSEL 6.1 22/27] ALSA: PCM: Allow resume only for suspended streams

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Message-ID: <20240709162401.31946-22-sashal@kernel.org>
Date: Tue,  9 Jul 2024 12:23:36 -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>,
	perex@...ex.cz,
	tiwai@...e.com,
	pavel.hofman@...tera.com,
	broonie@...nel.org,
	dhowells@...hat.com,
	linux-sound@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 22/27] ALSA: PCM: Allow resume only for suspended streams

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

[ Upstream commit 1225675ca74c746f09211528588e83b3def1ff6a ]

snd_pcm_resume() should bail out if the stream isn't in a suspended
state.  Otherwise it'd allow doubly resume.

Link: https://patch.msgid.link/20240624125443.27808-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/core/pcm_native.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 9238abbfb2d62..2b73518e5e314 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1781,6 +1781,8 @@ static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
 			      snd_pcm_state_t state)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
+	if (runtime->state != SNDRV_PCM_STATE_SUSPENDED)
+		return -EBADFD;
 	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
 		return -ENOSYS;
 	runtime->trigger_master = substream;
-- 
2.43.0