linux-kernel - [PATCH v3 2/3] ALSA: hdspm: don't disable if not enabled

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Date:   Sun, 21 Mar 2021 11:38:39 -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 2/3] ALSA: hdspm: don't disable if not enabled

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

[    1.786391] snd_hdspm 0000:00:03.0: disabling already-disabled device
[    1.786400] WARNING: CPU: 0 PID: 182 at drivers/pci/pci.c:2146 pci_disable_device+0x91/0xb0
[    1.795181] Call Trace:
[    1.795320]  snd_hdspm_card_free+0x58/0xa0 [snd_hdspm]
[    1.795595]  release_card_device+0x4b/0x80 [snd]
[    1.795860]  device_release+0x3b/0xa0
[    1.796072]  kobject_put+0x94/0x1b0
[    1.796260]  put_device+0x13/0x20
[    1.796438]  snd_card_free+0x61/0x90 [snd]
[    1.796659]  snd_hdspm_probe+0x97b/0x1440 [snd_hdspm]

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

diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 8d900c132f0f..00cbf81ab2a6 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -6883,7 +6883,8 @@ static int snd_hdspm_free(struct hdspm * hdspm)
 	if (hdspm->port)
 		pci_release_regions(hdspm->pci);
 
-	pci_disable_device(hdspm->pci);
+	if (pci_is_enabled(hdspm->pci))
+		pci_disable_device(hdspm->pci);
 	return 0;
 }
 
-- 
2.25.1