The VPU firmware setup registers a watchdog callback that accesses the
encoder context lock. Initialize the lock before selecting the firmware
implementation so the callback cannot observe an uninitialized lock during
probe.

Fixes: afaaf3a0f647 ("media: mediatek: vcodec: adding lock to protect encoder context list")
Cc: stable@vger.kernel.org
Assisted-by: Codex:GPT-5
Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
---
 .../media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c
index 4e4541b2f..e6cd3817a 100644
--- a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c
+++ b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c
@@ -255,6 +255,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 
 	INIT_LIST_HEAD(&dev->ctx_list);
 	dev->plat_dev = pdev;
+	spin_lock_init(&dev->dev_ctx_lock);
 
 	if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
 				  &rproc_phandle)) {
@@ -308,7 +309,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 
 	mutex_init(&dev->enc_mutex);
 	mutex_init(&dev->dev_mutex);
-	spin_lock_init(&dev->dev_ctx_lock);
 	spin_lock_init(&dev->irqlock);
 
 	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
-- 
2.34.1