From c531b9b49b146e1535dbed006d15e58f4f528f7e Mon Sep 17 00:00:00 2001 From: Bhanu Prakash Gollapudi Date: Fri, 8 Oct 2010 17:12:36 -0700 Subject: [PATCH] [SCSI] libfc: Do not let disc work cancel itself When number of NPIV ports created are greater than the xids allocated per pool -- for eg., creating 255 NPIV ports on a system with nr_cpu_ids of 32, with each pool containing 128 xids -- and then generating a link event - for eg., shutdown/no shutdown -- on the switch port causes the hang with the following stack trace. Call Trace: schedule_timeout+0x19d/0x230 wait_for_common+0xc0/0x170 __cancel_work_timer+0xcf/0x1b0 fc_disc_stop+0x16/0x30 [libfc] fc_lport_reset_locked+0x47/0x90 [libfc] fc_lport_enter_reset+0x67/0xe0 [libfc] fc_lport_disc_callback+0xbc/0xe0 [libfc] fc_disc_done+0xa8/0xf0 [libfc] fc_disc_timeout+0x29/0x40 [libfc] run_workqueue+0xb8/0x140 worker_thread+0x96/0x110 kthread+0x96/0xa0 child_rip+0xa/0x20 Fix is to not cancel the disc_work if discovery is already stopped, thus allowing lport state machine to restart and try discovery again. Signed-off-by: Bhanu Prakash Gollapudi Acked-by: Joe Eykholt Signed-off-by: Robert Love Signed-off-by: James Bottomley --- drivers/scsi/libfc/fc_disc.c | 5 ++--- include/scsi/libfc.h | 2 +- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c index 32f67c4b03fc..911b2736cafa 100644 --- a/drivers/scsi/libfc/fc_disc.c +++ b/drivers/scsi/libfc/fc_disc.c @@ -684,10 +684,9 @@ void fc_disc_stop(struct fc_lport *lport) { struct fc_disc *disc = &lport->disc; - if (disc) { + if (disc->pending) cancel_delayed_work_sync(&disc->disc_work); - fc_disc_stop_rports(disc); - } + fc_disc_stop_rports(disc); } /** diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h index 14be49b44e84..f986ab7ffe6f 100644 --- a/include/scsi/libfc.h +++ b/include/scsi/libfc.h @@ -721,7 +721,7 @@ struct libfc_function_template { * struct fc_disc - Discovery context * @retry_count: Number of retries * @pending: 1 if discovery is pending, 0 if not - * @requesting: 1 if discovery has been requested, 0 if not + * @requested: 1 if discovery has been requested, 0 if not * @seq_count: Number of sequences used for discovery * @buf_len: Length of the discovery buffer * @disc_id: Discovery ID