linux-kernel - [RFC PATCH 2/4] drm/etnaviv: Fix error path in etnaviv_gpu_clk

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Message-ID: <20200430124602.14463-3-frieder.schrempf@kontron.de>
Date:   Thu, 30 Apr 2020 12:46:10 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Adam Ford <aford173@...il.com>, Anson Huang <Anson.Huang@....com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Fabio Estevam <festevam@...il.com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Leonard Crestez <leonard.crestez@....com>,
        "Li Jun" <jun.li@....com>, Lucas Stach <l.stach@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Peng Fan <peng.fan@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        "Sascha Hauer" <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        "S.j. Wang" <shengjiu.wang@....com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "etnaviv@...ts.freedesktop.org" <etnaviv@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 2/4] drm/etnaviv: Fix error path in
 etnaviv_gpu_clk_enable()

From: Frieder Schrempf <frieder.schrempf@...tron.de>

In case enabling of the bus clock fails etnaviv_gpu_clk_enable()
returns without disabling the already enabled reg clock. Fix this.

Fixes: 65f037e8e908 ("drm/etnaviv: add support for slave interface clock")
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 23877c1f150a..7b138d4dd068 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1496,7 +1496,7 @@ static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
 	if (gpu->clk_bus) {
 		ret = clk_prepare_enable(gpu->clk_bus);
 		if (ret)
-			return ret;
+			goto disable_clk_reg;
 	}
 
 	if (gpu->clk_core) {
@@ -1519,6 +1519,9 @@ static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
 disable_clk_bus:
 	if (gpu->clk_bus)
 		clk_disable_unprepare(gpu->clk_bus);
+disable_clk_reg:
+	if (gpu->clk_reg)
+		clk_disable_unprepare(gpu->clk_reg);
 
 	return ret;
 }
-- 
2.17.1