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Subject: media: ivsc: csi: add separate lock for v4l2 control handler Author: Wentong Wu wentong.wu@intel.com Date: Fri Jun 7 21:25:46 2024 +0800
There're possibilities that privacy status change notification happens in the middle of the ongoing mei command which already takes the command lock, but v4l2_ctrl_s_ctrl() would also need the same lock prior to this patch, so this may results in circular locking problem. This patch adds one dedicated lock for v4l2 control handler to avoid described issue.
Fixes: 29006e196a56 ("media: pci: intel: ivsc: Add CSI submodule") Cc: stable@vger.kernel.org # for 6.6 and later Reported-by: Hao Yao hao.yao@intel.com Signed-off-by: Wentong Wu wentong.wu@intel.com Tested-by: Jason Chen jason.z.chen@intel.com Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl
drivers/media/pci/intel/ivsc/mei_csi.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/pci/intel/ivsc/mei_csi.c b/drivers/media/pci/intel/ivsc/mei_csi.c index f04a89584334..c6d8f72e4eec 100644 --- a/drivers/media/pci/intel/ivsc/mei_csi.c +++ b/drivers/media/pci/intel/ivsc/mei_csi.c @@ -126,6 +126,8 @@ struct mei_csi { struct v4l2_ctrl_handler ctrl_handler; struct v4l2_ctrl *freq_ctrl; struct v4l2_ctrl *privacy_ctrl; + /* lock for v4l2 controls */ + struct mutex ctrl_lock; unsigned int remote_pad; /* start streaming or not */ int streaming; @@ -559,11 +561,13 @@ static int mei_csi_init_controls(struct mei_csi *csi) u32 max; int ret;
+ mutex_init(&csi->ctrl_lock); + ret = v4l2_ctrl_handler_init(&csi->ctrl_handler, 2); if (ret) return ret;
- csi->ctrl_handler.lock = &csi->lock; + csi->ctrl_handler.lock = &csi->ctrl_lock;
max = ARRAY_SIZE(link_freq_menu_items) - 1; csi->freq_ctrl = v4l2_ctrl_new_int_menu(&csi->ctrl_handler, @@ -755,6 +759,7 @@ err_entity:
err_ctrl_handler: v4l2_ctrl_handler_free(&csi->ctrl_handler); + mutex_destroy(&csi->ctrl_lock); v4l2_async_nf_unregister(&csi->notifier); v4l2_async_nf_cleanup(&csi->notifier);
@@ -774,6 +779,7 @@ static void mei_csi_remove(struct mei_cl_device *cldev) v4l2_async_nf_unregister(&csi->notifier); v4l2_async_nf_cleanup(&csi->notifier); v4l2_ctrl_handler_free(&csi->ctrl_handler); + mutex_destroy(&csi->ctrl_lock); v4l2_async_unregister_subdev(&csi->subdev); v4l2_subdev_cleanup(&csi->subdev); media_entity_cleanup(&csi->subdev.entity);