From c336acd3331dcc191a97dbc66a557d47741657c7 Mon Sep 17 00:00:00 2001 From: Jon Mason Date: Thu, 17 Jan 2013 15:28:45 -0700 Subject: NTB: memcpy lockup workaround The system will appear to lockup for long periods of time due to the NTB driver spending too much time in memcpy. Avoid this by reducing the number of packets that can be serviced on a given interrupt. Signed-off-by: Jon Mason --- drivers/ntb/ntb_transport.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index cd9745b062e4..583a7d3f0ce1 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -1034,11 +1034,16 @@ out: static void ntb_transport_rx(unsigned long data) { struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; - int rc; + int rc, i; - do { + /* Limit the number of packets processed in a single interrupt to + * provide fairness to others + */ + for (i = 0; i < qp->rx_max_entry; i++) { rc = ntb_process_rxc(qp); - } while (!rc); + if (rc) + break; + } } static void ntb_transport_rxc_db(void *data, int db_num) -- cgit v1.2.3