[PATCH v4 0/2] media: amd: isp4: fix error handling in isp4sd_pwron_and_init()

[Yifei Gao]

This series fixes the error handling in isp4sd_pwron_and_init().

Patch 1 makes isp4if_alloc_fw_gpumem() release partial allocations on
failure, an independent leak that was previously masked by the deadlock
fixed in patch 2.

Patch 2 reworks the power-on error path into staged cleanup, fixing the
self-deadlock and, once it is gone, the runtime-PM imbalance and
unpowered MMIO access. The staged path relies on isp4if_start() cleaning
up fully on failure, which patch 1 completes, so patch 1 comes first.

Changes since v3:
- Trimmed the commit message of patch 2 per Sakari's review; no
  functional change.

Changes since v2:
- Added patch 1 to release partial allocations in
  isp4if_alloc_fw_gpumem(), as pointed out by Bin Du.
- Patch 2 is otherwise unchanged from v2.

v3: https://lore.kernel.org/linux-media/20260728141659.62310-1-gyf161023@xxxxxxxxx/
v2: https://lore.kernel.org/linux-media/20260727183500.298036-1-gyf161023@xxxxxxxxx/
v1: https://lore.kernel.org/linux-media/20260725203640.915626-1-gyf161023@xxxxxxxxx/

Yifei Gao (2):
  media: amd: isp4: release partial allocations in
    isp4if_alloc_fw_gpumem()
  media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error
    path

 .../media/platform/amd/isp4/isp4_interface.c  |  1 +
 drivers/media/platform/amd/isp4/isp4_subdev.c | 28 +++++++++++++++----
 2 files changed, 23 insertions(+), 6 deletions(-)

-- 
2.43.0