linux-kernel - [RESEND PATCH v1 4/7] media: chips-media: wave5: Use spinlock whenever state is changed

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Message-Id: <20250410034002.88-5-jackson.lee@chipsnmedia.com>
Date: Thu, 10 Apr 2025 12:39:59 +0900
From: "Jackson.lee" <jackson.lee@...psnmedia.com>
To: mchehab@...nel.org,
	hverkuil-cisco@...all.nl,
	sebastian.fricke@...labora.com,
	nicolas.dufresne@...labora.com,
	bob.beckett@...labora.com,
	dafna.hirschfeld@...labora.com
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jackson.lee@...psnmedia.com,
	lafley.kim@...psnmedia.com,
	b-brnich@...com,
	hverkuil@...all.nl,
	nas.chung@...psnmedia.com
Subject: [RESEND PATCH v1 4/7] media: chips-media: wave5: Use spinlock whenever state is changed

From: Jackson Lee <jackson.lee@...psnmedia.com>

The device_run and finish_decode is not any more synchronized,
so lock was needed in the device_run whenever state was changed.

Signed-off-by: Jackson Lee <jackson.lee@...psnmedia.com>
Signed-off-by: Nas Chung <nas.chung@...psnmedia.com>
---
 drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
index e0f4b11ee464..485320db9bdc 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
@@ -1577,6 +1577,7 @@ static void wave5_vpu_dec_device_run(void *priv)
 	struct queue_status_info q_status;
 	u32 fail_res = 0;
 	int ret = 0;
+	unsigned long flags;
 
 	dev_dbg(inst->dev->dev, "%s: Fill the ring buffer with new bitstream data", __func__);
 	pm_runtime_resume_and_get(inst->dev->dev);
@@ -1617,7 +1618,9 @@ static void wave5_vpu_dec_device_run(void *priv)
 			}
 			spin_unlock_irqrestore(&inst->state_spinlock, flags);
 		} else {
+			spin_lock_irqsave(&inst->state_spinlock, flags);
 			switch_state(inst, VPU_INST_STATE_INIT_SEQ);
+			spin_unlock_irqrestore(&inst->state_spinlock, flags);
 		}
 
 		break;
@@ -1628,8 +1631,9 @@ static void wave5_vpu_dec_device_run(void *priv)
 		 * we had a chance to switch, which leads to an invalid state
 		 * change.
 		 */
+		spin_lock_irqsave(&inst->state_spinlock, flags);
 		switch_state(inst, VPU_INST_STATE_PIC_RUN);
-
+		spin_unlock_irqrestore(&inst->state_spinlock, flags);
 		/*
 		 * During DRC, the picture decoding remains pending, so just leave the job
 		 * active until this decode operation completes.
@@ -1643,7 +1647,9 @@ static void wave5_vpu_dec_device_run(void *priv)
 		ret = wave5_prepare_fb(inst);
 		if (ret) {
 			dev_warn(inst->dev->dev, "Framebuffer preparation, fail: %d\n", ret);
+			spin_lock_irqsave(&inst->state_spinlock, flags);
 			switch_state(inst, VPU_INST_STATE_STOP);
+			spin_unlock_irqrestore(&inst->state_spinlock, flags);
 			break;
 		}
 
-- 
2.43.0