[PATCH] ASoC: codecs: wcd938x: fix missing mbhc init error handling

[PATCH] ASoC: codecs: wcd938x: fix missing mbhc init error handling

[Johan Hovold]

MBHC initialisation can fail so add the missing error handling to avoid
dereferencing an error pointer when later configuring the jack:

    Unable to handle kernel paging request at virtual address fffffffffffffff8

    pc : wcd_mbhc_start+0x28/0x380 [snd_soc_wcd_mbhc]
    lr : wcd938x_codec_set_jack+0x28/0x48 [snd_soc_wcd938x]

    Call trace:
     wcd_mbhc_start+0x28/0x380 [snd_soc_wcd_mbhc]
     wcd938x_codec_set_jack+0x28/0x48 [snd_soc_wcd938x]
     snd_soc_component_set_jack+0x28/0x8c [snd_soc_core]
     qcom_snd_wcd_jack_setup+0x7c/0x19c [snd_soc_qcom_common]
     sc8280xp_snd_init+0x20/0x2c [snd_soc_sc8280xp]
     snd_soc_link_init+0x28/0x90 [snd_soc_core]
     snd_soc_bind_card+0x628/0xbfc [snd_soc_core]
     snd_soc_register_card+0xec/0x104 [snd_soc_core]
     devm_snd_soc_register_card+0x4c/0xa4 [snd_soc_core]
     sc8280xp_platform_probe+0xf0/0x108 [snd_soc_sc8280xp]

Fixes: bcee7ed09b8e ("ASoC: codecs: wcd938x: add Multi Button Headset Control support")
Cc: stable@vger.kernel.org      # 5.15
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 sound/soc/codecs/wcd938x.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/wcd938x.c b/sound/soc/codecs/wcd938x.c
index 1595df2bf0e9..faa15a5ed2c8 100644
--- a/sound/soc/codecs/wcd938x.c
+++ b/sound/soc/codecs/wcd938x.c
@@ -2626,6 +2626,8 @@ static int wcd938x_mbhc_init(struct snd_soc_component *component)
 						     WCD938X_IRQ_HPHR_OCP_INT);
 
 	wcd938x->wcd_mbhc = wcd_mbhc_init(component, &mbhc_cb, intr_ids, wcd_mbhc_fields, true);
+	if (IS_ERR(wcd938x->wcd_mbhc))
+		return PTR_ERR(wcd938x->wcd_mbhc);
 
 	snd_soc_add_component_controls(component, impedance_detect_controls,
 				       ARRAY_SIZE(impedance_detect_controls));
-- 
2.39.3

Re: [PATCH] ASoC: codecs: wcd938x: fix missing mbhc init error handling

[Mark Brown]

On Mon, 03 Jul 2023 14:47:01 +0200, Johan Hovold wrote:
> MBHC initialisation can fail so add the missing error handling to avoid
> dereferencing an error pointer when later configuring the jack:
> 
>     Unable to handle kernel paging request at virtual address fffffffffffffff8
> 
>     pc : wcd_mbhc_start+0x28/0x380 [snd_soc_wcd_mbhc]
>     lr : wcd938x_codec_set_jack+0x28/0x48 [snd_soc_wcd938x]
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: codecs: wcd938x: fix missing mbhc init error handling
      commit: 7dfae2631bfbdebecd35fe7b472ab3cc95c9ed66

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark