Patch "media: platform: mtk-mdp3: fix error handling about components clock_on" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    media: platform: mtk-mdp3: fix error handling about components clock_on

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-platform-mtk-mdp3-fix-error-handling-about-com.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d0a3078b376b7c21239c1f75bb233581c151b22e
Author: Moudy Ho <moudy.ho@xxxxxxxxxxxx>
Date:   Thu Oct 20 15:17:59 2022 +0800

    media: platform: mtk-mdp3: fix error handling about components clock_on
    
    [ Upstream commit 74a596e7fca6d240d61def5f448e55c256c12fed ]
    
    Add goto statement in mdp_comp_clock_on() to avoid error code not being
    propagated or returning positive values.
    This change also performs a well-timed clock_off when an error occurs, and
    reduces unnecessary error logging in mdp_cmdq_send().
    
    Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 driver")
    Signed-off-by: Moudy Ho <moudy.ho@xxxxxxxxxxxx>
    Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
index e194dec8050a..124c1b96e96b 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
@@ -433,10 +433,8 @@ int mdp_cmdq_send(struct mdp_dev *mdp, struct mdp_cmdq_param *param)
 	cmd->mdp_ctx = param->mdp_ctx;
 
 	ret = mdp_comp_clocks_on(&mdp->pdev->dev, cmd->comps, cmd->num_comps);
-	if (ret) {
-		dev_err(dev, "comp %d failed to enable clock!\n", ret);
+	if (ret)
 		goto err_free_path;
-	}
 
 	dma_sync_single_for_device(mdp->cmdq_clt->chan->mbox->dev,
 				   cmd->pkt.pa_base, cmd->pkt.cmd_buf_size,
diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
index d3eaf8884412..7bc05f42a23c 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
@@ -699,12 +699,22 @@ int mdp_comp_clock_on(struct device *dev, struct mdp_comp *comp)
 			dev_err(dev,
 				"Failed to enable clk %d. type:%d id:%d\n",
 				i, comp->type, comp->id);
-			pm_runtime_put(comp->comp_dev);
-			return ret;
+			goto err_revert;
 		}
 	}
 
 	return 0;
+
+err_revert:
+	while (--i >= 0) {
+		if (IS_ERR_OR_NULL(comp->clks[i]))
+			continue;
+		clk_disable_unprepare(comp->clks[i]);
+	}
+	if (comp->comp_dev)
+		pm_runtime_put_sync(comp->comp_dev);
+
+	return ret;
 }
 
 void mdp_comp_clock_off(struct device *dev, struct mdp_comp *comp)
@@ -723,11 +733,13 @@ void mdp_comp_clock_off(struct device *dev, struct mdp_comp *comp)
 
 int mdp_comp_clocks_on(struct device *dev, struct mdp_comp *comps, int num)
 {
-	int i;
+	int i, ret;
 
-	for (i = 0; i < num; i++)
-		if (mdp_comp_clock_on(dev, &comps[i]) != 0)
-			return ++i;
+	for (i = 0; i < num; i++) {
+		ret = mdp_comp_clock_on(dev, &comps[i]);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }