[PATCH v3 03/17] media: rkisp1: isp: Fix and simplify (un)registration

Laurent Pinchart
2022-03-19T16:31:41Z

The rkisp1_isp_register() and rkisp1_isp_unregister() functions don't
destroy the mutex (in the error path for the former). Fix this, simplify
error handling at registration time as media_entity_cleanup() can be
called on an uninitialized entity, and make rkisp1_isp_unregister() and
safe to be called on an unregistered isp subdev to prepare for
simplification of error handling at probe time.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
.../platform/rockchip/rkisp1/rkisp1-isp.c | 20 ++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
index 2a35bf24e54e..f84e53b60ee1 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
@@ -1090,29 +1090,35 @@ int rkisp1_isp_register(struct rkisp1_device *rkisp1)
mutex_init(&isp->ops_lock);
ret = media_entity_pads_init(&sd->entity, RKISP1_ISP_PAD_MAX, pads);
if (ret)
- return ret;
+ goto error;

ret = v4l2_device_register_subdev(&rkisp1->v4l2_dev, sd);
if (ret) {
dev_err(rkisp1->dev, "Failed to register isp subdev\n");
- goto err_cleanup_media_entity;
+ goto error;
}

rkisp1_isp_init_config(sd, &state);
+
return 0;

-err_cleanup_media_entity:
+error:
media_entity_cleanup(&sd->entity);
-
+ mutex_destroy(&isp->ops_lock);
+ isp->sd.flags = 0;
return ret;
}

void rkisp1_isp_unregister(struct rkisp1_device *rkisp1)
{
- struct v4l2_subdev *sd = &rkisp1->isp.sd;
+ struct rkisp1_isp *isp = &rkisp1->isp;

- v4l2_device_unregister_subdev(sd);
- media_entity_cleanup(&sd->entity);
+ if (!isp->sd.flags)
+ return;
+
+ v4l2_device_unregister_subdev(&isp->sd);
+ media_entity_cleanup(&isp->sd.entity);
+ mutex_destroy(&isp->ops_lock);
}

/* ----------------------------------------------------------------------------