Subject: [PATCH net-next v6 13/13] net: dsa: realtek: rtl8365mb: fix trap_door > 7

From: Luiz Angelo Daros de Luca <[email-masked]>
Date: Fri, 28 Jan 2022 03:05:09 -0300

Trap door number is a 4-bit number divided in two regions (3 and 1-bit).
Both values were not masked properly. This bug does not affect supported
devices as they use up to port 7 (ext2). It would only be a problem if
the driver becomes compatible with 10-port switches like RTL8370MB and
RTL8310SR.

Signed-off-by: Luiz Angelo Daros de Luca <[email-masked]>
---
 drivers/net/dsa/realtek/rtl8365mb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/realtek/rtl8365mb.c b/drivers/net/dsa/realtek/rtl8365mb.c
index 34c99e7539e7..e1c5a67a21c4 100644
--- a/drivers/net/dsa/realtek/rtl8365mb.c
+++ b/drivers/net/dsa/realtek/rtl8365mb.c
@@ -1764,9 +1764,9 @@ static int rtl8365mb_cpu_config(struct realtek_priv *priv, const struct rtl8365m
 	      FIELD_PREP(RTL8365MB_CPU_CTRL_TAG_POSITION_MASK, cpu->position) |
 	      FIELD_PREP(RTL8365MB_CPU_CTRL_RXBYTECOUNT_MASK, cpu->rx_length) |
 	      FIELD_PREP(RTL8365MB_CPU_CTRL_TAG_FORMAT_MASK, cpu->format) |
-	      FIELD_PREP(RTL8365MB_CPU_CTRL_TRAP_PORT_MASK, cpu->trap_port) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_TRAP_PORT_MASK, cpu->trap_port & 0x7) |
 	      FIELD_PREP(RTL8365MB_CPU_CTRL_TRAP_PORT_EXT_MASK,
-			 cpu->trap_port >> 3);
+			 cpu->trap_port >> 3 & 0x1);
 	ret = regmap_write(priv->map, RTL8365MB_CPU_CTRL_REG, val);
 	if (ret)
 		return ret;
-- 
2.34.1