[v2,0/2] ASoC hdmi-codec: fix HDMI jack reporting

Message

Tzung-Bi Shih Feb. 17, 2020, 3:16 a.m. UTC

With proper unbinding audio components and inserting the HDMI external
display, kernel crashes as the following messages:

Unable to handle kernel NULL pointer dereference at virtual address ...
[snip]
Call trace:
 plugged_cb+0x1c/0x74
 mtk_hdmi_update_plugged_status+0x48/0x6c
 hdmi_conn_detect+0x1c/0x28
 drm_helper_probe_detect+0x110/0x170
 drm_helper_probe_single_connector_modes+0xd4/0x608
 drm_mode_getconnector+0x1e8/0x418

The 1st patch fixes the crash by notifying hdmi-codec's consumers to not
report jack status anymore when component removing.

The 2nd patch fixes race condition in mediatek/mtk_hdmi.c.

Changes from v1:
(https://patchwork.kernel.org/patch/11379979/)
- added the 1st patch
- use mutex to protect plugged_cb and codec_dev in 2nd patch

Tzung-Bi Shih (2):
  ASoC: hdmi-codec: set plugged_cb to NULL when component removing
  drm/mediatek: fix race condition for HDMI jack status reporting

 drivers/gpu/drm/mediatek/mtk_hdmi.c | 11 ++++++++++-
 sound/soc/codecs/hdmi-codec.c       | 10 ++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)