linux-kernel - [PATCH] dmaengine: ptdma: Fix the error handling path in pt_core

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Message-Id: <1b2573cf3cd077494531993239f80c08e7feb39e.1643551909.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 30 Jan 2022 15:12:09 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Sanjay R Mehta <sanju.mehta@....com>, Vinod Koul <vkoul@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        dmaengine@...r.kernel.org
Subject: [PATCH] dmaengine: ptdma: Fix the error handling path in pt_core_init()

In order to free resources correctly in the error handling path of
pt_core_init(), 2 goto's have to be switched. Otherwise, some resources
will leak and we will try to release things that have not been allocated
yet.

Fixes: fa5d823b16a9 ("dmaengine: ptdma: Initial driver for the AMD PTDMA")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/dma/ptdma/ptdma-dev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ptdma/ptdma-dev.c b/drivers/dma/ptdma/ptdma-dev.c
index 8a6bf291a73f..3fa2a6ed4b68 100644
--- a/drivers/dma/ptdma/ptdma-dev.c
+++ b/drivers/dma/ptdma/ptdma-dev.c
@@ -207,7 +207,7 @@ int pt_core_init(struct pt_device *pt)
 	if (!cmd_q->qbase) {
 		dev_err(dev, "unable to allocate command queue\n");
 		ret = -ENOMEM;
-		goto e_dma_alloc;
+		goto e_pool;
 	}
 
 	cmd_q->qidx = 0;
@@ -230,7 +230,7 @@ int pt_core_init(struct pt_device *pt)
 	/* Request an irq */
 	ret = request_irq(pt->pt_irq, pt_core_irq_handler, 0, dev_name(pt->dev), pt);
 	if (ret)
-		goto e_pool;
+		goto e_dma_alloc;
 
 	/* Update the device registers with queue information. */
 	cmd_q->qcontrol &= ~CMD_Q_SIZE;
-- 
2.32.0