linux-kernel - [PATCH v3 1/3] ALSA: hdsp: don't disable if not enabled

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Message-Id: <20210321153840.378226-2-ztong0001@gmail.com>
Date:   Sun, 21 Mar 2021 11:38:38 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Tong Zhang <ztong0001@...il.com>,
        Jasmin Fazlic <superfassl@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        Romain Perier <romain.perier@...il.com>,
        Allen Pais <allen.lkml@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Naoki Hayama <naoki.hayama@...eo.co.jp>,
        Tom Rix <trix@...hat.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>
Cc:     Takashi Iwai <tiwai@...e.de>
Subject: [PATCH v3 1/3] ALSA: hdsp: don't disable if not enabled

hdsp wants to disable a not enabled pci device, which makes kernel
throw a warning. Make sure the device is enabled before calling disable.

[    1.758292] snd_hdsp 0000:00:03.0: disabling already-disabled device
[    1.758327] WARNING: CPU: 0 PID: 180 at drivers/pci/pci.c:2146 pci_disable_device+0x91/0xb0
[    1.766985] Call Trace:
[    1.767121]  snd_hdsp_card_free+0x94/0xf0 [snd_hdsp]
[    1.767388]  release_card_device+0x4b/0x80 [snd]
[    1.767639]  device_release+0x3b/0xa0
[    1.767838]  kobject_put+0x94/0x1b0
[    1.768027]  put_device+0x13/0x20
[    1.768207]  snd_card_free+0x61/0x90 [snd]
[    1.768430]  snd_hdsp_probe+0x524/0x5e0 [snd_hdsp]

Suggested-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
 sound/pci/rme9652/hdsp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index 4cf879c42dc4..720297cbdf87 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -5390,7 +5390,8 @@ static int snd_hdsp_free(struct hdsp *hdsp)
 	if (hdsp->port)
 		pci_release_regions(hdsp->pci);
 
-	pci_disable_device(hdsp->pci);
+	if (pci_is_enabled(hdsp->pci))
+		pci_disable_device(hdsp->pci);
 	return 0;
 }
 
-- 
2.25.1