ALSA: hda - Flush the pending probe work at remove

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>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 86bbc6307c4f8551205a4ad11d72692e8bcf6a7c..256e6cda218f939e6e6d09201c10d39827825ce9 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -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)