diff mbox series

[3/8,SRU,Noble] UBUNTU: SAUCE: media: ivsc: csi: add separate lock for v4l2 control handler

Message ID 20240625093138.3793885-4-vicamo.yang@canonical.com
State New
Headers show
Series Fix vsc ace set host command timeout | expand

Commit Message

You-Sheng Yang June 25, 2024, 9:31 a.m. UTC 
From: Wentong Wu <wentong.wu@intel.com>

BugLink: https://bugs.launchpad.net/bugs/2067364

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.

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>
(cherry picked from https://lore.kernel.org/r/all/20240607132547.2820515-3-wentong.wu@intel.com)
Signed-off-by: You-Sheng Yang <vicamo.yang@canonical.com>
---
 drivers/media/pci/intel/ivsc/mei_csi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/media/pci/intel/ivsc/mei_csi.c b/drivers/media/pci/intel/ivsc/mei_csi.c
index 6e2d865cd0d5..1e713aa0e931 100644
--- a/drivers/media/pci/intel/ivsc/mei_csi.c
+++ b/drivers/media/pci/intel/ivsc/mei_csi.c
@@ -123,6 +123,8 @@  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;
@@ -615,11 +617,13 @@  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,
@@ -798,6 +802,7 @@  static int mei_csi_probe(struct mei_cl_device *cldev,
 
 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);
 
@@ -817,6 +822,7 @@  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);