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ALSA: hda - Flush the pending probe work at remove

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As HD-audio driver does deferred probe internally via workqueue, the
driver might go into the mixed state doing both probe and remove when
the module gets unloaded during the probe work.  This eventually
triggers an Oops, unsurprisingly.

For avoiding this race, we just need to flush the pending probe work
explicitly before actually starting the resource release.

Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=960710
Cc: <stable@vger.kernel.org> # v3.17+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-01-20 17:19:02 +01:00
parent bca8e98804
commit 991f86d7ae
1 changed files with 9 additions and 1 deletions
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10
sound/pci/hda/hda_intel.c
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@ -2151,9 +2151,17 @@ i915_power_fail:
static void azx_remove(struct pci_dev *pci)
{
struct snd_card *card = pci_get_drvdata(pci);
struct azx *chip;
struct hda_intel *hda;
if (card) {
/* flush the pending probing work */
chip = card->private_data;
hda = container_of(chip, struct hda_intel, chip);
flush_work(&hda->probe_work);
if (card)
snd_card_free(card);
}
}
static void azx_shutdown(struct pci_dev *pci)