[PATCH] drm: sun4i_tcon: use devm_clk_get_enabled in `sun4i_tcon_init_clocks`

[XuDong Liu]

Smatch reports:
drivers/gpu/drm/sun4i/sun4i_tcon.c:805 sun4i_tcon_init_clocks() warn:
'tcon->clk' from clk_prepare_enable() not released on lines: 792,801.

In the function sun4i_tcon_init_clocks(), tcon->clk and tcon->sclk0 are
not disabled in the error handling, which affects the release of
these variable. Although sun4i_tcon_bind(), which calls
sun4i_tcon_init_clocks(), use sun4i_tcon_free_clocks to disable the
variables mentioned, but the error handling branch of
sun4i_tcon_init_clocks() ignores the required disable process.

To fix this issue, use the devm_clk_get_enabled to automatically
balance enable and disabled calls. As original implementation use
sun4i_tcon_free_clocks() to disable clk explicitly, we delete the
related calls and error handling that are no longer needed.

Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
Fixes: b14e945bda8a ("drm/sun4i: tcon: Prepare and enable TCON channel 0 clock 
at init")
Fixes: 8e9240472522 ("drm/sun4i: support TCONs without channel 1")
Fixes: 34d698f6e349 ("drm/sun4i: Add has_channel_0 TCON quirk")
Signed-off-by: XuDong Liu <m202071...@hust.edu.cn>
Reviewed-by: Dongliang Mu <dz...@hust.edu.cn>
---
The issue is discovered by static analysis, and the patch is not tested
yet.
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c 
b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 523a6d787921..936796851ffd 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -778,21 +778,19 @@ static irqreturn_t sun4i_tcon_handler(int irq, void 
*private)
 static int sun4i_tcon_init_clocks(struct device *dev,
                                  struct sun4i_tcon *tcon)
 {
-       tcon->clk = devm_clk_get(dev, "ahb");
+       tcon->clk = devm_clk_get_enabled(dev, "ahb");
        if (IS_ERR(tcon->clk)) {
                dev_err(dev, "Couldn't get the TCON bus clock\n");
                return PTR_ERR(tcon->clk);
        }
-       clk_prepare_enable(tcon->clk);
 
        if (tcon->quirks->has_channel_0) {
-               tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
+               tcon->sclk0 = devm_clk_get_enabled(dev, "tcon-ch0");
                if (IS_ERR(tcon->sclk0)) {
                        dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
                        return PTR_ERR(tcon->sclk0);
                }
        }
-       clk_prepare_enable(tcon->sclk0);
 
        if (tcon->quirks->has_channel_1) {
                tcon->sclk1 = devm_clk_get(dev, "tcon-ch1");
@@ -805,12 +803,6 @@ static int sun4i_tcon_init_clocks(struct device *dev,
        return 0;
 }
 
-static void sun4i_tcon_free_clocks(struct sun4i_tcon *tcon)
-{
-       clk_disable_unprepare(tcon->sclk0);
-       clk_disable_unprepare(tcon->clk);
-}
-
 static int sun4i_tcon_init_irq(struct device *dev,
                               struct sun4i_tcon *tcon)
 {
@@ -1223,14 +1215,14 @@ static int sun4i_tcon_bind(struct device *dev, struct 
device *master,
        ret = sun4i_tcon_init_regmap(dev, tcon);
        if (ret) {
                dev_err(dev, "Couldn't init our TCON regmap\n");
-               goto err_free_clocks;
+               goto err_assert_reset;
        }
 
        if (tcon->quirks->has_channel_0) {
                ret = sun4i_dclk_create(dev, tcon);
                if (ret) {
                        dev_err(dev, "Couldn't create our TCON dot clock\n");
-                       goto err_free_clocks;
+                       goto err_assert_reset;
                }
        }
 
@@ -1293,8 +1285,6 @@ static int sun4i_tcon_bind(struct device *dev, struct 
device *master,
 err_free_dotclock:
        if (tcon->quirks->has_channel_0)
                sun4i_dclk_free(tcon);
-err_free_clocks:
-       sun4i_tcon_free_clocks(tcon);
 err_assert_reset:
        reset_control_assert(tcon->lcd_rst);
        return ret;
@@ -1308,7 +1298,6 @@ static void sun4i_tcon_unbind(struct device *dev, struct 
device *master,
        list_del(&tcon->list);
        if (tcon->quirks->has_channel_0)
                sun4i_dclk_free(tcon);
-       sun4i_tcon_free_clocks(tcon);
 }
 
 static const struct component_ops sun4i_tcon_ops = {
-- 
2.34.1