[PATCH v4 0/2] media: i2c: ov02c10: Fix race condition and power sequence

[Saikiran <bjsaikiran@gmail.com>]

This series addresses driver correctness and stability issues in the OV02C10
sensor driver. It fixes a use-after-free race condition during removal and
aligns the power-on sequence with the datasheet requirements.

Note on v3/Brownouts:
The "Autosuspend" workaround proposed in v3 to handle regulator brownouts on
Qualcomm X1E80100 platforms has been dropped from this series.

I am pursuing the root-cause analysis for the regulator discharge delays
separately. The platform-specific constraints (2.3s passive discharge) will
be handled via the regulator subsystem (linux-arm-msm) and device tree,
keeping the media driver clean of platform-specific workarounds. I will
continue investigating the underlying physical discharge characteristics
and PMIC status registers as requested by maintainers.

This v4 series now strictly focuses on generic driver correctness:

Patch 1: Fixes a critical race condition in the remove() function where
resources were freed while the device was potentially still active, leading
to kernel oops.

Patch 2: Corrects the power-on sequence to strictly follow the datasheet
timing (T1) by asserting the reset pin for 5ms before enabling power rails.
This ensures the sensor enters a known clean state during cold boot.

Changes in v4:
- Dropped Patch 3 (Runtime PM Autosuspend) to separate platform-specific
  regulator fixes from generic driver cleanup.
- Modified Patch 2:
  - Reduced reset assertion delay from 10ms to 5ms (usleep_range 5000-6000)
    to match datasheet specs and maintainer feedback.
  - Removed the software reset (0x0103) and extra regulator delays to keep
    the sequence minimal and compliant.
- Patch 1 carried forward with Reviewed-by tag.

Changes in v3:
- Superseded previous "pipeline lock" and "brownout" series.
- Added strict power-on sequencing.
- Added fix for use-after-free in remove().

Saikiran (2):
  media: i2c: ov02c10: Fix use-after-free in remove function
  media: i2c: ov02c10: Correct power-on sequence and timing

 drivers/media/i2c/ov02c10.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)