linux-kernel - [PATCH] rapidio: apply RX/TX enable to active switch ports only

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Date:	Tue, 21 Aug 2012 10:23:55 -0400
From:	Alexandre Bounine <alexandre.bounine@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:	Alexandre Bounine <alexandre.bounine@....com>,
	Matt Porter <mporter@...nel.crashing.org>
Subject: [PATCH] rapidio: apply RX/TX enable to active switch ports only

Modify RIO enumeration to apply RX/TX enable operations only to active
switch ports. This will leave inactive ports in condition consistent with
their state.

This patch is applicable to kernel versions starting from v2.6.35.

Signed-off-by: Alexandre Bounine <alexandre.bounine@....com>
Cc: Matt Porter <mporter@...nel.crashing.org>
---
 drivers/rapidio/rio-scan.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index 2bebd79..02e686b 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -839,12 +839,10 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 		for (port_num = 0;
 		     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 		     port_num++) {
-			/*Enable Input Output Port (transmitter reviever)*/
-			rio_enable_rx_tx_port(port, 0,
+			if (sw_inport == port_num) {
+				rio_enable_rx_tx_port(port, 0,
 					      RIO_ANY_DESTID(port->sys_size),
 					      hopcount, port_num);
-
-			if (sw_inport == port_num) {
 				rdev->rswitch->port_ok |= (1 << port_num);
 				continue;
 			}
@@ -857,6 +855,9 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 				pr_debug(
 				    "RIO: scanning device on port %d\n",
 				    port_num);
+				rio_enable_rx_tx_port(port, 0,
+					      RIO_ANY_DESTID(port->sys_size),
+					      hopcount, port_num);
 				rdev->rswitch->port_ok |= (1 << port_num);
 				rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 						RIO_ANY_DESTID(port->sys_size),
-- 
1.7.8.4

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