[PATCH 6.6 088/254] dmaengine: ti: k3-udma: fix device leak on udma lookup

Greg Kroah-Hartman
2026-01-28T15:31:19Z

From: Johan Hovold <johan@kernel.org>

commit 430f7803b69cd5e5694e5dfc884c6628870af36e upstream.

Make sure to drop the reference taken when looking up the UDMA platform
device.

Note that holding a reference to a platform device does not prevent its
driver data from going away so there is no point in keeping the
reference after the lookup helper returns.

Fixes: d70241913413 ("dmaengine: ti: k3-udma: Add glue layer for non DMAengine users")
Fixes: 1438cde8fe9c ("dmaengine: ti: k3-udma: add missing put_device() call in of_xudma_dev_get()")
Cc: stable@vger.kernel.org # 5.6: 1438cde8fe9c
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251117161258.10679-17-johan@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/dma/ti/k3-udma-private.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dma/ti/k3-udma-private.c
+++ b/drivers/dma/ti/k3-udma-private.c
@@ -42,9 +42,9 @@ struct udma_dev *of_xudma_dev_get(struct
}

ud = platform_get_drvdata(pdev);
+ put_device(&pdev->dev);
if (!ud) {
pr_debug("UDMA has not been probed\n");
- put_device(&pdev->dev);
return ERR_PTR(-EPROBE_DEFER);
}