[PATCH 3.9-stable] NTB: reset tx_index on link toggle

From: Jonghwan Choi
Date: Fri May 17 2013 - 22:49:33 EST

From: Jon Mason <jon.mason@xxxxxxxxx>

This patch looks like it should be in the 3.9-stable tree, should we apply


From: "Jon Mason <jon.mason@xxxxxxxxx>"

commit 90f9e934647e652a69396e18c779215a493271cf upstream

If the NTB link toggles, the driver could stop receiving due to the
tx_index not being set to 0 on the transmitting size on a link-up event.
This is due to the driver expecting the incoming data to start at the
beginning of the receive buffer and not at a random place.

Cc: <stable@xxxxxxxxxxxxxxx> # 3.9.x: ad3e2751: ntb: off by one
Cc: <stable@xxxxxxxxxxxxxxx> # 3.9.x: cc0f868d: NTB: fix pointer math
Cc: <stable@xxxxxxxxxxxxxxx> # 3.9.x: 113fc505: NTB: Handle 64bit BAR
Cc: <stable@xxxxxxxxxxxxxxx> # 3.9.x: b77b2637: NTB: Link toggle memory
Signed-off-by: Jon Mason <jon.mason@xxxxxxxxx>
Signed-off-by: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
drivers/ntb/ntb_transport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index f5a424d..0828124 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -505,6 +505,7 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,

qp->rx_pkts = 0;
qp->tx_pkts = 0;
+ qp->tx_index = 0;

static void ntb_free_mw(struct ntb_transport *nt, int num_mw)
@@ -819,7 +820,6 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
qp->tx_mw = qp->rx_info + 1;
qp->tx_max_frame = min(transport_mtu, tx_size);
qp->tx_max_entry = tx_size / qp->tx_max_frame;
- qp->tx_index = 0;

if (nt->debugfs_dir) {
char debugfs_name[4];

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