The mux clk type registration function does not stop or return errors
if any clk failed to be registered, nor does it implement an error
handling path. This may result in a partially working device if any
step failed.

Make the register function return proper error codes, and bail out if
errors occur. Proper cleanup, i.e. unregister any clks that were
successfully registered, is done in the new error path.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Miles Chen <miles.chen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/clk/mediatek/clk-mux.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c
index 70aa42144632..f51e67650f03 100644
--- a/drivers/clk/mediatek/clk-mux.c
+++ b/drivers/clk/mediatek/clk-mux.c
@@ -215,13 +215,26 @@ int mtk_clk_register_muxes(const struct mtk_mux *muxes,
 
 		if (IS_ERR(clk)) {
 			pr_err("Failed to register clk %s: %pe\n", mux->name, clk);
-			continue;
+			goto err;
 		}
 
 		clk_data->clks[mux->id] = clk;
 	}
 
 	return 0;
+
+err:
+	while (--i >= 0) {
+		const struct mtk_mux *mux = &muxes[i];
+
+		if (IS_ERR_OR_NULL(clk_data->clks[mux->id]))
+			continue;
+
+		mtk_clk_unregister_mux(clk_data->clks[mux->id]);
+		clk_data->clks[mux->id] = ERR_PTR(-ENOENT);
+	}
+
+	return PTR_ERR(clk);
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_muxes);
 
-- 
2.35.0.263.gb82422642f-goog

On Tue, 2022-02-08 at 20:40 +0800, Chen-Yu Tsai wrote:
> The mux clk type registration function does not stop or return errors
> if any clk failed to be registered, nor does it implement an error
> handling path. This may result in a partially working device if any
> step failed.
> 
> Make the register function return proper error codes, and bail out if
> errors occur. Proper cleanup, i.e. unregister any clks that were
> successfully registered, is done in the new error path.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
> Reviewed-by: Miles Chen <miles.chen@mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>

Reviewed-by: Chun-Jie Chen <chun-jie.chen@mediatek.com>
> ---
>  drivers/clk/mediatek/clk-mux.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/mediatek/clk-mux.c
> b/drivers/clk/mediatek/clk-mux.c
> index 70aa42144632..f51e67650f03 100644
> --- a/drivers/clk/mediatek/clk-mux.c
> +++ b/drivers/clk/mediatek/clk-mux.c
> @@ -215,13 +215,26 @@ int mtk_clk_register_muxes(const struct mtk_mux
> *muxes,
>  
>  		if (IS_ERR(clk)) {
>  			pr_err("Failed to register clk %s: %pe\n", mux-
> >name, clk);
> -			continue;
> +			goto err;
>  		}
>  
>  		clk_data->clks[mux->id] = clk;
>  	}
>  
>  	return 0;
> +
> +err:
> +	while (--i >= 0) {
> +		const struct mtk_mux *mux = &muxes[i];
> +
> +		if (IS_ERR_OR_NULL(clk_data->clks[mux->id]))
> +			continue;
> +
> +		mtk_clk_unregister_mux(clk_data->clks[mux->id]);
> +		clk_data->clks[mux->id] = ERR_PTR(-ENOENT);
> +	}
> +
> +	return PTR_ERR(clk);
>  }
>  EXPORT_SYMBOL_GPL(mtk_clk_register_muxes);
>  

Quoting Chen-Yu Tsai (2022-02-08 04:40:27)
> The mux clk type registration function does not stop or return errors
> if any clk failed to be registered, nor does it implement an error
> handling path. This may result in a partially working device if any
> step failed.
> 
> Make the register function return proper error codes, and bail out if
> errors occur. Proper cleanup, i.e. unregister any clks that were
> successfully registered, is done in the new error path.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
> Reviewed-by: Miles Chen <miles.chen@mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---

Applied to clk-next