[PATCH 5.4 52/92] staging: mt7621-dma: Fix a resource leak in an error handling path

[Greg Kroah-Hartman]

From: Christophe JAILLET <christophe.jail...@wanadoo.fr>

commit d887d6104adeb94d1b926936ea21f07367f0ff9f upstream.

If an error occurs after calling 'mtk_hsdma_init()', it must be undone by
a corresponding call to 'mtk_hsdma_uninit()' as already done in the
remove function.

Fixes: 0853c7a53eb3 ("staging: mt7621-dma: ralink: add rt2880 dma engine")
Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
Cc: stable <sta...@vger.kernel.org>
Link: 
https://lore.kernel.org/r/20201213153513.138723-1-christophe.jail...@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/staging/mt7621-dma/mtk-hsdma.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/staging/mt7621-dma/mtk-hsdma.c
+++ b/drivers/staging/mt7621-dma/mtk-hsdma.c
@@ -714,7 +714,7 @@ static int mtk_hsdma_probe(struct platfo
        ret = dma_async_device_register(dd);
        if (ret) {
                dev_err(&pdev->dev, "failed to register dma device\n");
-               return ret;
+               goto err_uninit_hsdma;
        }
 
        ret = of_dma_controller_register(pdev->dev.of_node,
@@ -730,6 +730,8 @@ static int mtk_hsdma_probe(struct platfo
 
 err_unregister:
        dma_async_device_unregister(dd);
+err_uninit_hsdma:
+       mtk_hsdma_uninit(hsdma);
        return ret;
 }