[PATCH 12/35] media: platform: mtk-mdp3: Use refcount_t for job_count

Ricardo Ribalda
2024-04-15T19:34:42Z

Use an API that resembles more the actual use of job_count.

Found by cocci:
drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c:527:5-24: WARNING: atomic_dec_and_test variation before object free at line 541.
drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c:578:6-25: WARNING: atomic_dec_and_test variation before object free at line 581.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c | 10 +++++-----
drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c | 6 +++---
drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h | 2 +-
drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c | 6 +++---
4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
index 1d64bac34b90..ea2ea119dd2a 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
@@ -524,7 +524,7 @@ static void mdp_auto_release_work(struct work_struct *work)
mdp_comp_clocks_off(&mdp->pdev->dev, cmd->comps,
cmd->num_comps);

- if (atomic_dec_and_test(&mdp->job_count)) {
+ if (refcount_dec_and_test(&mdp->job_count)) {
if (cmd->mdp_ctx)
mdp_m2m_job_finish(cmd->mdp_ctx);

@@ -575,7 +575,7 @@ static void mdp_handle_cmdq_callback(struct mbox_client *cl, void *mssg)
mdp_comp_clocks_off(&mdp->pdev->dev, cmd->comps,
cmd->num_comps);

- if (atomic_dec_and_test(&mdp->job_count))
+ if (refcount_dec_and_test(&mdp->job_count))
wake_up(&mdp->callback_wq);

mdp_cmdq_pkt_destroy(&cmd->pkt);
@@ -724,9 +724,9 @@ int mdp_cmdq_send(struct mdp_dev *mdp, struct mdp_cmdq_param *param)
int i, ret;
u8 pp_used = __get_pp_num(param->param->type);

- atomic_set(&mdp->job_count, pp_used);
+ refcount_set(&mdp->job_count, pp_used);
if (atomic_read(&mdp->suspended)) {
- atomic_set(&mdp->job_count, 0);
+ refcount_set(&mdp->job_count, 0);
return -ECANCELED;
}

@@ -764,7 +764,7 @@ int mdp_cmdq_send(struct mdp_dev *mdp, struct mdp_cmdq_param *param)
mdp_comp_clocks_off(&mdp->pdev->dev, cmd[i]->comps,
cmd[i]->num_comps);
err_cancel_job:
- atomic_set(&mdp->job_count, 0);
+ refcount_set(&mdp->job_count, 0);

return ret;
}
diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
index 5209f531ef8d..c1f3bf98120a 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
@@ -380,14 +380,14 @@ static int __maybe_unused mdp_suspend(struct device *dev)

atomic_set(&mdp->suspended, 1);

- if (atomic_read(&mdp->job_count)) {
+ if (refcount_read(&mdp->job_count)) {
ret = wait_event_timeout(mdp->callback_wq,
- !atomic_read(&mdp->job_count),
+ !refcount_read(&mdp->job_count),
2 * HZ);
if (ret == 0) {
dev_err(dev,
"%s:flushed cmdq task incomplete, count=%d\n",
- __func__, atomic_read(&mdp->job_count));
+ __func__, refcount_read(&mdp->job_count));
return -EBUSY;
}
}
diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
index 8c09e984fd01..430251f63754 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
@@ -134,7 +134,7 @@ struct mdp_dev {
/* synchronization protect for m2m device operation */
struct mutex m2m_lock;
atomic_t suspended;
- atomic_t job_count;
+ refcount_t job_count;
};

struct mdp_pipe_info {
diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c
index 35a8b059bde5..0e69128a3772 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c
@@ -104,14 +104,14 @@ static void mdp_m2m_device_run(void *priv)
task.cb_data = NULL;
task.mdp_ctx = ctx;

- if (atomic_read(&ctx->mdp_dev->job_count)) {
+ if (refcount_read(&ctx->mdp_dev->job_count)) {
ret = wait_event_timeout(ctx->mdp_dev->callback_wq,
- !atomic_read(&ctx->mdp_dev->job_count),
+ !refcount_read(&ctx->mdp_dev->job_count),
2 * HZ);
if (ret == 0) {
dev_err(&ctx->mdp_dev->pdev->dev,
"%d jobs not yet done\n",
- atomic_read(&ctx->mdp_dev->job_count));
+ refcount_read(&ctx->mdp_dev->job_count));
goto worker_end;
}
}

--
2.44.0.683.g7961c838ac-goog