[PATCH 09/24] serial: 8250: 8250_bcm7271: fix DMA address truncation to 32 bits

[Greg Kroah-Hartman]

From: Joshua Rogers <linux@xxxxxxxxx>

The local variable daddr is declared as u32 but assigned from dma_addr_t
fields (priv->rx_addr and priv->tx_addr), which are 64-bit on ARM64.
This silently truncates the upper 32 bits, causing upper_32_bits(daddr)
to always produce zero when programming the UART DMA descriptor high
address registers.  Change the type to dma_addr_t to preserve the full
DMA address.

Cc: Al Cooper <alcooperx@xxxxxxxxx>
Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>
Signed-off-by: Joshua Rogers <linux@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/tty/serial/8250/8250_bcm7271.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 974d9af146a1..4fdd261e55f5 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -315,7 +315,7 @@ static int brcmuart_arbitration(struct brcmuart_priv *priv, bool acquire)
 
 static void brcmuart_init_dma_hardware(struct brcmuart_priv *priv)
 {
-	u32 daddr;
+	dma_addr_t daddr;
 	u32 value;
 	int x;
 

-- 
2.56.0