[PATCH] pinctrl: stm32: Fix clock reference leak in stm32_pctl_probe()

[Wentao Liang]

stm32_pctl_probe() obtains one clock per bank with
of_clk_get_by_name(), but none of the error paths drop those
references: the loop returns directly when a later clock lookup fails,
and both the clk_bulk_prepare_enable() failure and the err_register
path return without calling clk_bulk_put().  clk_bulk_disable_unprepare()
only disables the clocks, it does not release them.

Release the references on these paths; the success path keeps them as
the driver needs them for suspend/resume.

Fixes: 451bc9aea9a1 ("pinctrl: stm32: Add check for clk_enable()")
Cc: stable at vger.kernel.org
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
 drivers/pinctrl/stm32/pinctrl-stm32.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index 6a99708a5a23..587dbf1512dc 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -1976,6 +1976,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
 		pctl->clks[i].clk = of_clk_get_by_name(np, NULL);
 		if (IS_ERR(pctl->clks[i].clk)) {
 			fwnode_handle_put(child);
+			clk_bulk_put(i, pctl->clks);
 			return dev_err_probe(dev, PTR_ERR(pctl->clks[i].clk),
 					     "failed to get clk\n");
 		}
@@ -1986,6 +1987,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
 	ret = clk_bulk_prepare_enable(banks, pctl->clks);
 	if (ret) {
 		dev_err(dev, "failed to prepare_enable clk (%d)\n", ret);
+		clk_bulk_put(banks, pctl->clks);
 		return ret;
 	}
 
@@ -2010,6 +2012,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
 	}
 
 	clk_bulk_disable_unprepare(banks, pctl->clks);
+	clk_bulk_put(banks, pctl->clks);
 	return ret;
 }
 EXPORT_SYMBOL(stm32_pctl_probe);
-- 
2.34.1