[PATCH] media: aspeed: disable resolution work before removing the device

[Myeonghun Pak]

A resolution-change interrupt schedules res_work. The worker enables the
video engine clocks, initializes registers and detects the resolution.
It can also queue a V4L2 event or restart frame capture. The remove path
shuts down the engine and releases resources without cancelling or
waiting for this work, so the worker can undo the shutdown or access
resources after they have been released.

Disable and drain res_work before turning the engine off. This cancels
pending work, waits for a running worker and prevents the IRQ handler
from queuing the work again. Keep the clocks and IRQ handler available
during the wait because resolution detection can wait for an IRQ.

This issue was found by static analysis.

Fixes: d2b4387f3bdf ("media: platform: Add Aspeed Video Engine driver")
Assisted-by: LLM
Co-developed-by: Ijae Kim <ae878000@xxxxxxxxx>
Signed-off-by: Ijae Kim <ae878000@xxxxxxxxx>
Signed-off-by: Myeonghun Pak <mhun512@xxxxxxxxx>
---
Compile-tested with GCC, W=1 (arm64). No runtime testing.

 drivers/media/platform/aspeed/aspeed-video.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/aspeed/aspeed-video.c b/drivers/media/platform/aspeed/aspeed-video.c
index a292275..4274b90 100644
--- a/drivers/media/platform/aspeed/aspeed-video.c
+++ b/drivers/media/platform/aspeed/aspeed-video.c
@@ -2360,6 +2360,7 @@ static void aspeed_video_remove(struct platform_device *pdev)
 	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 	struct aspeed_video *video = to_aspeed_video(v4l2_dev);
 
+	disable_delayed_work_sync(&video->res_work);
 	aspeed_video_off(video);
 
 	aspeed_video_debugfs_remove(video);