From 4e93c1294f4b051d574d6bc59755d2863286990e Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Wed, 8 Jan 2020 12:50:06 +0100 Subject: [PATCH] ASoC: max98090: fix incorrect helper in max98090_dapm_put_enum_double() Commit 62d5ae4cafb7 ("ASoC: max98090: save and restore SHDN when changing sensitive registers") extended the code for handling "LTENL Mux", "LTENR Mux", "LBENL Mux" and "LBENR Mux" controls by adding a custom max98090_dapm_put_enum_double() function to them. However that function used incorrect helper to get its component object. Fix this by using the proper snd_soc_dapm_* helper. This fixes the following NULL pointer exception observed on Exynos4412-based Odroid U3 board: 8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 000000b0 pgd = (ptrval) [000000b0] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 1104 Comm: alsactl Not tainted 5.5.0-rc5-next-20200107 #166 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) PC is at __mutex_lock+0x54/0xb18 LR is at ___might_sleep+0x3c/0x2e0 ... Process alsactl (pid: 1104, stack limit = 0x(ptrval)) ... [] (__mutex_lock) from [] (mutex_lock_nested+0x1c/0x24) [] (mutex_lock_nested) from [] (max98090_shdn_save+0x1c/0x28) [] (max98090_shdn_save) from [] (max98090_dapm_put_enum_double+0x20/0x40) [] (max98090_dapm_put_enum_double) from [] (snd_ctl_ioctl+0x190/0xbb8) [] (snd_ctl_ioctl) from [] (ksys_ioctl+0x470/0xaf8) [] (ksys_ioctl) from [] (ret_fast_syscall+0x0/0x28) ... ---[ end trace 0e93f0580f4b9241 ]--- Fixes: 62d5ae4cafb7 ("ASoC: max98090: save and restore SHDN when changing sensitive registers") Signed-off-by: Marek Szyprowski Reviewed-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20200108115007.31095-1-m.szyprowski@samsung.com Signed-off-by: Mark Brown --- sound/soc/codecs/max98090.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c index c01ce4a3f86d..ede03663cbed 100644 --- a/sound/soc/codecs/max98090.c +++ b/sound/soc/codecs/max98090.c @@ -98,7 +98,7 @@ static int max98090_put_enum_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_component *component = - snd_soc_kcontrol_component(kcontrol); + snd_soc_dapm_kcontrol_component(kcontrol); struct max98090_priv *max98090 = snd_soc_component_get_drvdata(component); int ret;