[PATCH 4.4 37/93] dmaengine: fsldma: Fix a resource leak in an error handling path of the probe function

[Greg Kroah-Hartman]

From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>

[ Upstream commit b202d4e82531a62a33a6b14d321dd2aad491578e ]

In case of error, the previous 'fsl_dma_chan_probe()' calls must be undone
by some 'fsl_dma_chan_remove()', as already done in the remove function.

It was added in the remove function in commit 77cd62e8082b ("fsldma: allow
Freescale Elo DMA driver to be compiled as a module")

Fixes: d3f620b2c4fe ("fsldma: simplify IRQ probing and handling")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20201212160614.92576-1-christophe.jaillet@xxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/dma/fsldma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 1a637104cc08e..7c4b4c71d3a0e 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1335,6 +1335,7 @@ static int fsldma_of_probe(struct platform_device *op)
 {
 	struct fsldma_device *fdev;
 	struct device_node *child;
+	unsigned int i;
 	int err;
 
 	fdev = kzalloc(sizeof(*fdev), GFP_KERNEL);
@@ -1416,6 +1417,10 @@ static int fsldma_of_probe(struct platform_device *op)
 	return 0;
 
 out_free_fdev:
+	for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
+		if (fdev->chan[i])
+			fsl_dma_chan_remove(fdev->chan[i]);
+	}
 	irq_dispose_mapping(fdev->irq);
 	kfree(fdev);
 out_return:
-- 
2.27.0