[source] b53: allow ports with higher numbers than CPU port

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=846eca673f818300a3c1729158b4c110cf316e38

commit 846eca673f818300a3c1729158b4c110cf316e38
Author: Rafał Miłecki <zajec5 at gmail.com>
AuthorDate: Wed Jul 27 14:15:32 2016 +0200

    b53: allow ports with higher numbers than CPU port
    
    Our code was assuming CPU port uses the highest number. My BCM53573
    device has eth0 connected to port 8 and eth1 connected to port 5. While
    working on support for it I tried to:
    1) Enable all ports (including port 8)
    2) Set CPU port to 5
    
    I noticed port 8 is not accessible anymore. It was just a development
    process but it seems like something worth fixing anyway.
    
    Signed-off-by: Rafał Miłecki <zajec5 at gmail.com>
    Acked-by: Jonas Gorski <jonas.gorski at gmail.com>
---
 target/linux/generic/files/drivers/net/phy/b53/b53_common.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/target/linux/generic/files/drivers/net/phy/b53/b53_common.c b/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
index 676e301..d96d8b8 100644
--- a/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
+++ b/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
@@ -1370,9 +1370,8 @@ static int b53_switch_init(struct b53_device *dev)
 			sw_dev->cpu_port = 5;
 	}
 
-	/* cpu port is always last */
-	sw_dev->ports = sw_dev->cpu_port + 1;
 	dev->enabled_ports |= BIT(sw_dev->cpu_port);
+	sw_dev->ports = fls(dev->enabled_ports);
 
 	dev->ports = devm_kzalloc(dev->dev,
 				  sizeof(struct b53_port) * sw_dev->ports,