From: Fabio Estevam fabio.estevam@freescale.com

The following crash happens when trying to unload the snd_soc_imx_wm8962 module while playback is active:

[ 208.666868] Unable to handle kernel paging request at virtc [ 208.674110] pgd = 80004000 [ 208.676867] [7f06541c] *pgd=4c334811, *pte=00000000, *ppte=00000000 [ 208.683211] Internal error: Oops: 80000007 [#1] SMP ARM [ 208.688445] Modules linked in: snd_soc_wm8962 snd_soc_fsl_ssi snd_soc_imx_audmux imx_pcm_fiq evbug] ...

In order to avoid such problem, fill the card owner field as suggested by Lars-Peter Clausen:

"But looking at the source it seems that this is a core feature of ALSA and at least for the card module itself it will do the ref-counting when a stream is started/stopped. And we even support setting the owner of a card in ASoC. It's just that pretty much no ASoC card driver bothers to set the owner field in the snd_soc_card struct. So this particular problem can be fixed by updating the imx-wm8962 driver to set the owner field."

By doing as suggested, we no longer see the crash when attempting to unload the snd_soc_imx_wm8962 module while playback is active:

$ modprobe -r snd_soc_imx_wm8962 modprobe: can't unload module snd_soc_imx_wm8962: Resource temporarily unavailable

Reported-by: Jiada Wang jiada_wang@mentor.com Suggested-by: Lars-Peter Clausen lars@metafoo.de Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- sound/soc/fsl/imx-wm8962.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/sound/soc/fsl/imx-wm8962.c b/sound/soc/fsl/imx-wm8962.c index 4caacb0..cd146d4 100644 --- a/sound/soc/fsl/imx-wm8962.c +++ b/sound/soc/fsl/imx-wm8962.c @@ -257,6 +257,7 @@ static int imx_wm8962_probe(struct platform_device *pdev) if (ret) goto clk_fail; data->card.num_links = 1; + data->card.owner = THIS_MODULE; data->card.dai_link = &data->dai; data->card.dapm_widgets = imx_wm8962_dapm_widgets; data->card.num_dapm_widgets = ARRAY_SIZE(imx_wm8962_dapm_widgets);