linux-kernel - [PATCH v2 0/3] media: wave5: Fix critical issues in driver remove path

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Message-Id: <20251204094153.1530331-1-xulin.sun@windriver.com>
Date: Thu,  4 Dec 2025 17:41:50 +0800
From: Xulin Sun <xulin.sun@...driver.com>
To: nas.chung@...psnmedia.com, jackson.lee@...psnmedia.com, mchehab@...nel.org
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        nicolas.dufresne@...labora.com, hverkuil@...nel.org,
        dafna.hirschfeld@...labora.com, xulin.sun@...driver.com
Subject: [PATCH v2 0/3] media: wave5: Fix critical issues in driver remove path

This patch series fixes three critical issues in the wave5 VPU driver's
remove path that cause kernel warnings and system crashes.

The issues were discovered and consistently reproduced on kernel
6.12.58-rt6 with the TI AM62A platform during extensive testing with
gstreamer encoding pipelines and module load/unload cycles.

v1: https://lore.kernel.org/linux-media/20251203040935.2685490-1-xulin.sun@windriver.com

Changes in v2:
- Reformatted commit messages per maintainer feedback
  * Removed "Symptom:/Root cause:/Fix:" section titles
  * Reordered content: fix description → root cause → symptoms
  * Added Fixes: tags for backport tracking
- Retested on media/master (6.18-rc5)
  * All three issues still exist in the code logic
  * Issues are harder to trigger on 6.18-rc5
  * Applied patches resolve all issues on both 6.12.58-rt6 and 6.18-rc5

Patch 1: Fixes PM runtime reference count underflow
Patch 2: Fixes kthread worker destruction warning
Patch 3: Fixes kernel panic due to incorrect cleanup order

Testing performed:
- 50+ consecutive H.264/H.265 encoding operations
- 100+ modprobe/rmmod cycles
- Tested on both 6.12.58-rt6 (TI AM62A) and 6.18-rc5
- No warnings or crashes observed after applying patches

Xulin Sun (3):
  media: wave5: Fix PM runtime usage count underflow
  media: wave5: Fix kthread worker destruction in polling mode
  media: wave5: Fix device cleanup order to prevent kernel panic

 drivers/media/platform/chips-media/wave5/wave5-vpu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

-- 
2.49.1