[PATCH 3/7] dma: apbh: fix out-of-bounds write on 64-bit SoCs

[Ahmad Fatoum]

i.MX8 MM & MN are both ARM64 SoCs with a device compatible
with "fsl,imx28-dma-apbh". Probing the barebox device driver on these
SoCs would invoke undefined behavior however, because of an
errant cast. Fix this.

This has a side-effect: Whereas before, probing devices matched by
driver name failed with -ENODEV, they are now considered to be
compatible to IMX23_DMA instead. As we don't depend on this, this
is deemed acceptable.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 drivers/dma/apbh_dma.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index 3bee89f78b85..186c69388c7f 100644
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -596,9 +596,7 @@ static int apbh_dma_probe(struct device_d *dev)
 	enum mxs_dma_id id;
 	int ret, channel;
 
-	ret = dev_get_drvdata(dev, (const void **)&id);
-	if (ret)
-		return ret;
+	id = (enum mxs_dma_id)device_get_match_data(dev);
 
 	apbh_dma = apbh = xzalloc(sizeof(*apbh));
 	iores = dev_request_mem_resource(dev, 0);
-- 
2.28.0