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authorBhanu Prakash Gollapudi <bprakash@broadcom.com>2010-10-09 02:12:36 +0200
committerJames Bottomley <James.Bottomley@suse.de>2010-10-25 22:11:37 +0200
commitc531b9b49b146e1535dbed006d15e58f4f528f7e (patch)
tree85da9abe1a8b169f578312d8904a8075b91eebc5 /drivers/scsi/libfc/fc_disc.c
parent[SCSI] libfc: possible race could panic system due to NULL fsp->cmd (diff)
downloadlinux-c531b9b49b146e1535dbed006d15e58f4f528f7e.tar.xz
linux-c531b9b49b146e1535dbed006d15e58f4f528f7e.zip
[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 <bprakash@broadcom.com> Acked-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/libfc/fc_disc.c')
-rw-r--r--drivers/scsi/libfc/fc_disc.c5
1 files changed, 2 insertions, 3 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);
}
/**