[PATCH 5.17 274/772] drm/bridge: Fix error handling in analogix_dp_probe

Greg Kroah-Hartman
2022-06-07T20:58:52Z

From: Miaoqian Lin <linmq006@gmail.com>

[ Upstream commit 9f15930bb2ef9f031d62ffc49629cbae89137733 ]

In the error handling path, the clk_prepare_enable() function
call should be balanced by a corresponding 'clk_disable_unprepare()'
call, as already done in the remove function.

Fixes: 3424e3a4f844 ("drm: bridge: analogix/dp: split exynos dp driver to bridge directory")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220420011644.25730-1-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../gpu/drm/bridge/analogix/analogix_dp_core.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index b7d2e4449cfa..7fe19c56f792 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1698,8 +1698,10 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(dp->reg_base))
- return ERR_CAST(dp->reg_base);
+ if (IS_ERR(dp->reg_base)) {
+ ret = PTR_ERR(dp->reg_base);
+ goto err_disable_clk;
+ }

dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");

@@ -1711,7 +1713,8 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
if (IS_ERR(dp->hpd_gpiod)) {
dev_err(dev, "error getting HDP GPIO: %ld\n",
PTR_ERR(dp->hpd_gpiod));
- return ERR_CAST(dp->hpd_gpiod);
+ ret = PTR_ERR(dp->hpd_gpiod);
+ goto err_disable_clk;
}

if (dp->hpd_gpiod) {
@@ -1731,7 +1734,8 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)

if (dp->irq == -ENXIO) {
dev_err(&pdev->dev, "failed to get irq\n");
- return ERR_PTR(-ENODEV);
+ ret = -ENODEV;
+ goto err_disable_clk;
}

ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
@@ -1740,11 +1744,15 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
irq_flags, "analogix-dp", dp);
if (ret) {
dev_err(&pdev->dev, "failed to request irq\n");
- return ERR_PTR(ret);
+ goto err_disable_clk;
}
disable_irq(dp->irq);

return dp;
+
+err_disable_clk:
+ clk_disable_unprepare(dp->clock);
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(analogix_dp_probe);

--
2.35.1