From: "Chia-Lin Kao (AceLan)" acelan.kao@canonical.com
[ Upstream commit 54bae4c17c11688339eb73a04fd24203bb6e7494 ]
The Chicony Electronics HP 5MP Cameras (USB ID 04F2:B824 & 04F2:B82C) report a HID sensor interface that is not actually implemented. Attempting to access this non-functional sensor via iio_info causes system hangs as runtime PM tries to wake up an unresponsive sensor.
Add these 2 devices to the HID ignore list since the sensor interface is non-functional by design and should not be exposed to userspace.
Signed-off-by: Chia-Lin Kao (AceLan) acelan.kao@canonical.com Signed-off-by: Jiri Kosina jkosina@suse.com Signed-off-by: Sasha Levin sashal@kernel.org ---
**YES**
This commit should be backported to stable kernel trees. Here's my extensive analysis:
## Key Characteristics of This Commit:
1. **Fixes a Critical User-Facing Bug**: The commit addresses system hangs that occur when userspace attempts to access non-functional HID sensor interfaces through iio_info. This is a serious usability issue that can make the system unresponsive.
2. **Minimal and Contained Changes**: The patch only adds two device IDs to existing infrastructure: - In `drivers/hid/hid-ids.h`: Added `USB_DEVICE_ID_CHICONY_HP_5MP_CAMERA` (0xb824) and `USB_DEVICE_ID_CHICONY_HP_5MP_CAMERA2` (0xb82c) - In `drivers/hid/hid-quirks.c`: Added these two devices to the `hid_ignore_list[]` array
3. **Zero Risk of Regression**: The changes only affect the specific USB devices (04F2:B824 and 04F2:B82C). No existing functionality is modified, and no code logic is changed.
## Comparison with Similar Commits:
This commit is nearly identical to **Similar Commit #1** (which was backported), where a QUANTA HP 5MP Camera (0408:5473) was added to the ignore list for the exact same reason - non-functional sensor causing system hangs. Both commits: - Target HP 5MP cameras with non-functional sensors - Use the same fix approach (adding to HID ignore list) - Prevent system hangs when accessing the sensor
## Alignment with Stable Kernel Rules:
The commit perfectly aligns with stable tree criteria: - **Fixes a real bug**: System hangs are critical issues - **Already in Linus' tree**: Signed-off by Jiri Kosina (HID maintainer) - **Small change**: Only 4 lines of actual code changes - **Obviously correct**: Simply adding device IDs to an ignore list - **No new features**: Pure bugfix - **Hardware-specific**: Only affects users with these specific cameras
## Historical Precedent:
Looking at the provided similar commits: - 4 out of 5 hardware quirk commits were backported (80% backport rate) - All commits fixing system hangs or device disconnections were backported - The only non-backported commit (#4) involved architectural changes to enum handling
This commit follows the exact pattern of successfully backported hardware quirks, making it an excellent candidate for stable inclusion.
drivers/hid/hid-ids.h | 2 ++ drivers/hid/hid-quirks.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index f344df00db03a..0d1d7162814f3 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -305,6 +305,8 @@ #define USB_DEVICE_ID_ASUS_AK1D 0x1125 #define USB_DEVICE_ID_CHICONY_TOSHIBA_WT10A 0x1408 #define USB_DEVICE_ID_CHICONY_ACER_SWITCH12 0x1421 +#define USB_DEVICE_ID_CHICONY_HP_5MP_CAMERA 0xb824 +#define USB_DEVICE_ID_CHICONY_HP_5MP_CAMERA2 0xb82c
#define USB_VENDOR_ID_CHUNGHWAT 0x2247 #define USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH 0x0001 diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c index e4d80307b898c..80372342c176a 100644 --- a/drivers/hid/hid-quirks.c +++ b/drivers/hid/hid-quirks.c @@ -747,6 +747,8 @@ static const struct hid_device_id hid_ignore_list[] = { { HID_USB_DEVICE(USB_VENDOR_ID_AVERMEDIA, USB_DEVICE_ID_AVER_FM_MR800) }, { HID_USB_DEVICE(USB_VENDOR_ID_AXENTIA, USB_DEVICE_ID_AXENTIA_FM_RADIO) }, { HID_USB_DEVICE(USB_VENDOR_ID_BERKSHIRE, USB_DEVICE_ID_BERKSHIRE_PCWD) }, + { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_HP_5MP_CAMERA) }, + { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_HP_5MP_CAMERA2) }, { HID_USB_DEVICE(USB_VENDOR_ID_CIDC, 0x0103) }, { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_RADIO_SI470X) }, { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_RADIO_SI4713) },