From 8d4630dcf41214719cf44a94f8eec2a83f69943b Mon Sep 17 00:00:00 2001 From: Alexandre Bounine Date: Thu, 4 Oct 2012 17:16:02 -0700 Subject: [PATCH] rapidio: apply RX/TX enable to active switch ports only Apply port RX/TX enable operations only to active switch ports. RapidIO specification (Part 6: LP-Serial Physical Layer) recommends to keep Output Port Enable (TX) and Input Port Enable (RX) control bits in disabled state (0b0) after device reset. It also allows to have implementation specific reset state for these bits. This patch ensures that TX/RX enable action is applied only to active switch's ports while preserving an initial state of inactive ones. This patch is intended to keep inactive switch ports with inbound and outbound packet transfers disabled to block unexpected packets during hot insertion event. While it does not fix any visible malfunction it is intended to prevent such events in future. Signed-off-by: Alexandre Bounine Cc: Matt Porter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rapidio/rio-scan.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c index 2bebd791a092..02e686b4c19a 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), -- 2.20.1