Re: [PATCH v2 3/3] media: amphion: Remove lock in s_ctrl callback

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Ming Qian,

W dniu 25.04.2024 o 08:50, Ming Qian pisze:
There is no need to add lock in s_ctrl callback, it has been
synchronized by the ctrl_handler's lock, otherwise it may led to
deadlock if driver call v4l2_ctrl_s_ctrl().

Signed-off-by: Ming Qian <ming.qian@xxxxxxx>
---
  drivers/media/platform/amphion/vdec.c | 2 --
  drivers/media/platform/amphion/venc.c | 2 --
  2 files changed, 4 deletions(-)

diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c
index a57f9f4f3b87..6a38a0fa0e2d 100644
--- a/drivers/media/platform/amphion/vdec.c
+++ b/drivers/media/platform/amphion/vdec.c
@@ -195,7 +195,6 @@ static int vdec_op_s_ctrl(struct v4l2_ctrl *ctrl)
  	struct vdec_t *vdec = inst->priv;
  	int ret = 0;
- vpu_inst_lock(inst);

I assume that PATCH v2 2/3 might cause the said deadlock to happen?
If so, maybe it would make more sense to make the current patch preceed
 PATCH v2 2/3? Otherwise the kernel at PATCH v2 2/3 introduces a potential
deadlock.

Regards,

Andrzej

  	switch (ctrl->id) {
  	case V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY_ENABLE:
  		vdec->params.display_delay_enable = ctrl->val;
@@ -207,7 +206,6 @@ static int vdec_op_s_ctrl(struct v4l2_ctrl *ctrl)
  		ret = -EINVAL;
  		break;
  	}
-	vpu_inst_unlock(inst);
return ret;
  }
diff --git a/drivers/media/platform/amphion/venc.c b/drivers/media/platform/amphion/venc.c
index cdfaba9d107b..351b4edc8742 100644
--- a/drivers/media/platform/amphion/venc.c
+++ b/drivers/media/platform/amphion/venc.c
@@ -518,7 +518,6 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
  	struct venc_t *venc = inst->priv;
  	int ret = 0;
- vpu_inst_lock(inst);
  	switch (ctrl->id) {
  	case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
  		venc->params.profile = ctrl->val;
@@ -579,7 +578,6 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
  		ret = -EINVAL;
  		break;
  	}
-	vpu_inst_unlock(inst);
return ret;
  }





[Index of Archives]     [Linux Input]     [Video for Linux]     [Gstreamer Embedded]     [Mplayer Users]     [Linux USB Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]

  Powered by Linux