linux-kernel - [PATCH 5.6 019/166] ALSA: hda: Dont release card at firmware loading error

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Date:   Wed, 22 Apr 2020 11:55:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.6 019/166] ALSA: hda: Dont release card at firmware loading error

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

commit 25faa4bd37c10f19e4b848b9032a17a3d44c6f09 upstream.

At the error path of the firmware loading error, the driver tries to
release the card object and set NULL to drvdata.  This may be referred
badly at the possible PM action, as the driver itself is still bound
and the PM callbacks read the card object.

Instead, we continue the probing as if it were no option set.  This is
often a better choice than the forced abort, too.

Fixes: 5cb543dba986 ("ALSA: hda - Deferred probing with request_firmware_nowait()")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=207043
Link: https://lore.kernel.org/r/20200413082034.25166-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/pci/hda/hda_intel.c |   19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2031,24 +2031,15 @@ static void azx_firmware_cb(const struct
 {
 	struct snd_card *card = context;
 	struct azx *chip = card->private_data;
-	struct pci_dev *pci = chip->pci;
 
-	if (!fw) {
-		dev_err(card->dev, "Cannot load firmware, aborting\n");
-		goto error;
-	}
-
-	chip->fw = fw;
+	if (fw)
+		chip->fw = fw;
+	else
+		dev_err(card->dev, "Cannot load firmware, continue without patching\n");
 	if (!chip->disabled) {
 		/* continue probing */
-		if (azx_probe_continue(chip))
-			goto error;
+		azx_probe_continue(chip);
 	}
-	return; /* OK */
-
- error:
-	snd_card_free(card);
-	pci_set_drvdata(pci, NULL);
 }
 #endif