[PATCH net v2] net: ethernet: stmmac: dwmac-rk: fix bulk clock leak when the PHY clock fails

[PATCH net v2] net: ethernet: stmmac: dwmac-rk: fix bulk clock leak when the PHY clock fails

[Coia Prant]

gmac_clk_enable() enables the bulk clocks first and then the optional
PHY clock. If clk_prepare_enable() on the PHY clock fails, the function
returns without rolling back the bulk clocks, and bsp_priv->clk_enabled
stays false, so the later gmac_clk_enable(bsp_priv, false) becomes a
no-op and the bulk clock references are leaked.

Add the missing clk_bulk_disable_unprepare() on that failure path.

Fixes: ea449f7fa0bf ("net: ethernet: stmmac: dwmac-rk: rework optional clock handling")
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>
Signed-off-by: Coia Prant <coiaprant@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 8d7042e689261..72bdbcb5e863a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -1162,8 +1162,11 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
 				return ret;
 
 			ret = clk_prepare_enable(bsp_priv->clk_phy);
-			if (ret)
+			if (ret) {
+				clk_bulk_disable_unprepare(bsp_priv->num_clks,
+							   bsp_priv->clks);
 				return ret;
+			}
 
 			rk_configure_io_clksel(bsp_priv);
 			rk_ungate_rmii_clock(bsp_priv);
-- 
2.47.3