[PATCH v3 04/17] media: rkisp1: resizer: Fix and simplify (un)registration

Laurent Pinchart
2022-03-19T16:31:42Z

The rkisp1_rsz_register() and rkisp1_rsz_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_rsz_unregister() and
rkisp1_resizer_devs_unregister() safe to be called on an unregistered
resizer subdev to prepare for simplification of error handling at probe
time.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Dafna Hirschfeld <dafna@fastmail.com>
---
.../platform/rockchip/rkisp1/rkisp1-resizer.c | 34 +++++++++----------
1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c
index 2070f4b06705..df2beee1be99 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c
@@ -782,8 +782,12 @@ static const struct v4l2_subdev_ops rkisp1_rsz_ops = {

static void rkisp1_rsz_unregister(struct rkisp1_resizer *rsz)
{
+ if (!rsz->rkisp1)
+ return;
+
v4l2_device_unregister_subdev(&rsz->sd);
media_entity_cleanup(&rsz->sd.entity);
+ mutex_destroy(&rsz->ops_lock);
}

static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
@@ -821,47 +825,43 @@ static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
mutex_init(&rsz->ops_lock);
ret = media_entity_pads_init(&sd->entity, RKISP1_RSZ_PAD_MAX, pads);
if (ret)
- return ret;
+ goto error;

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

rkisp1_rsz_init_config(sd, &state);
return 0;

-err_cleanup_media_entity:
+error:
media_entity_cleanup(&sd->entity);
-
+ mutex_destroy(&rsz->ops_lock);
return ret;
}

int rkisp1_resizer_devs_register(struct rkisp1_device *rkisp1)
{
- struct rkisp1_resizer *rsz;
- unsigned int i, j;
+ unsigned int i;
int ret;

for (i = 0; i < ARRAY_SIZE(rkisp1->resizer_devs); i++) {
- rsz = &rkisp1->resizer_devs[i];
+ struct rkisp1_resizer *rsz = &rkisp1->resizer_devs[i];
+
rsz->rkisp1 = rkisp1;
rsz->id = i;
+
ret = rkisp1_rsz_register(rsz);
- if (ret)
- goto err_unreg_resizer_devs;
+ if (ret) {
+ rsz->rkisp1 = NULL;
+ rkisp1_resizer_devs_unregister(rkisp1);
+ return ret;
+ }
}

return 0;
-
-err_unreg_resizer_devs:
- for (j = 0; j < i; j++) {
- rsz = &rkisp1->resizer_devs[j];
- rkisp1_rsz_unregister(rsz);
- }
-
- return ret;
}

void rkisp1_resizer_devs_unregister(struct rkisp1_device *rkisp1)