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ALSA: hda - Flush the pending probe work at remove

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commit 991f86d7ae upstream.

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
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2016-01-20 17:19:02 +01:00
committed by Greg Kroah-Hartman
parent 5833733480
commit f5b62074b3
1 changed files with 9 additions and 1 deletions
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10
sound/pci/hda/hda_intel.c
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@@ -2126,9 +2126,17 @@ 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)