Patch "media: amphion: lock and check m2m_ctx in event handler" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    media: amphion: lock and check m2m_ctx in event handler

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-amphion-lock-and-check-m2m_ctx-in-event-handle.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 60707991630228563a04741059705ead29bef4d7
Author: Ming Qian <ming.qian@xxxxxxx>
Date:   Mon Nov 21 06:34:42 2022 +0000

    media: amphion: lock and check m2m_ctx in event handler
    
    [ Upstream commit 1ade3f3f16986cd7c6fce02feede957f03eb8a42 ]
    
    driver needs to cancel vpu before releasing the vpu instance,
    so call v4l2_m2m_ctx_release() first,
    to handle the redundant event triggered after m2m_ctx is released.
    
    lock and check m2m_ctx in the event handler.
    
    Fixes: 3cd084519c6f ("media: amphion: add vpu v4l2 m2m support")
    Signed-off-by: Ming Qian <ming.qian@xxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/platform/amphion/vpu_msgs.c b/drivers/media/platform/amphion/vpu_msgs.c
index d8247f36d84b..92672a802b49 100644
--- a/drivers/media/platform/amphion/vpu_msgs.c
+++ b/drivers/media/platform/amphion/vpu_msgs.c
@@ -43,6 +43,7 @@ static void vpu_session_handle_mem_request(struct vpu_inst *inst, struct vpu_rpc
 		  req_data.ref_frame_num,
 		  req_data.act_buf_size,
 		  req_data.act_buf_num);
+	vpu_inst_lock(inst);
 	call_void_vop(inst, mem_request,
 		      req_data.enc_frame_size,
 		      req_data.enc_frame_num,
@@ -50,6 +51,7 @@ static void vpu_session_handle_mem_request(struct vpu_inst *inst, struct vpu_rpc
 		      req_data.ref_frame_num,
 		      req_data.act_buf_size,
 		      req_data.act_buf_num);
+	vpu_inst_unlock(inst);
 }
 
 static void vpu_session_handle_stop_done(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
diff --git a/drivers/media/platform/amphion/vpu_v4l2.c b/drivers/media/platform/amphion/vpu_v4l2.c
index a24e2d0e9542..590d1084e5a5 100644
--- a/drivers/media/platform/amphion/vpu_v4l2.c
+++ b/drivers/media/platform/amphion/vpu_v4l2.c
@@ -242,8 +242,12 @@ int vpu_process_capture_buffer(struct vpu_inst *inst)
 
 struct vb2_v4l2_buffer *vpu_next_src_buf(struct vpu_inst *inst)
 {
-	struct vb2_v4l2_buffer *src_buf = v4l2_m2m_next_src_buf(inst->fh.m2m_ctx);
+	struct vb2_v4l2_buffer *src_buf = NULL;
 
+	if (!inst->fh.m2m_ctx)
+		return NULL;
+
+	src_buf = v4l2_m2m_next_src_buf(inst->fh.m2m_ctx);
 	if (!src_buf || vpu_get_buffer_state(src_buf) == VPU_BUF_STATE_IDLE)
 		return NULL;
 
@@ -266,7 +270,7 @@ void vpu_skip_frame(struct vpu_inst *inst, int count)
 	enum vb2_buffer_state state;
 	int i = 0;
 
-	if (count <= 0)
+	if (count <= 0 || !inst->fh.m2m_ctx)
 		return;
 
 	while (i < count) {