linux-kernel - [PATCH] dmaengine: lgm: Fix an error handling path in intel_ldma

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Date:   Sun, 22 May 2022 19:41:05 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Vinod Koul <vkoul@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Amireddy Mallikarjuna reddy 
        <mallikarjunax.reddy@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        dmaengine@...r.kernel.org
Subject: [PATCH] dmaengine: lgm: Fix an error handling path in intel_ldma_probe()

ldma_clk_disable() calls both:
	clk_disable_unprepare(d->core_clk);
	reset_control_assert(d->rst);

So, should devm_reset_control_get_optional() fail, core_clk should not
be prepare_enable'd before it, otherwise it will never be
disable_unprepare'd.

Reorder the code to handle the error handling path as expected.

Fixes: 32d31c79a1a4 ("dmaengine: Add Intel LGM SoC DMA support.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/dma/lgm/lgm-dma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/lgm/lgm-dma.c b/drivers/dma/lgm/lgm-dma.c
index efe8bd3a0e2a..9b9184f964be 100644
--- a/drivers/dma/lgm/lgm-dma.c
+++ b/drivers/dma/lgm/lgm-dma.c
@@ -1593,11 +1593,12 @@ static int intel_ldma_probe(struct platform_device *pdev)
 	d->core_clk = devm_clk_get_optional(dev, NULL);
 	if (IS_ERR(d->core_clk))
 		return PTR_ERR(d->core_clk);
-	clk_prepare_enable(d->core_clk);
 
 	d->rst = devm_reset_control_get_optional(dev, NULL);
 	if (IS_ERR(d->rst))
 		return PTR_ERR(d->rst);
+
+	clk_prepare_enable(d->core_clk);
 	reset_control_deassert(d->rst);
 
 	ret = devm_add_action_or_reset(dev, ldma_clk_disable, d);
-- 
2.34.1