From: Jon Mason <[email protected]> This patch looks like it should be in the 3.9-stable tree, should we apply it?
------------------ From: "Jon Mason <[email protected]>" commit c336acd3331dcc191a97dbc66a557d47741657c7 upstream 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. Cc: <[email protected]> # 3.9.x: ad3e2751: ntb: off by one Cc: <[email protected]> # 3.9.x: cc0f868d: NTB: fix pointer math Cc: <[email protected]> # 3.9.x: 113fc505: NTB: Handle 64bit BAR Cc: <[email protected]> # 3.9.x: b77b2637: NTB: Link toggle memory Cc: <[email protected]> # 3.9.x: 90f9e934: NTB: reset tx_index on Cc: <[email protected]> # 3.9.x: c9d534c8: NTB: Correctly handle receive Signed-off-by: Jon Mason <[email protected]> Signed-off-by: Jonghwan Choi <[email protected]> --- 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 a288a26..0f66daa 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) -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
