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authorNeerav Parikh <Neerav.Parikh@intel.com>2013-01-16 03:42:38 +0400
committerRobert Love <robert.w.love@intel.com>2013-01-28 23:36:51 +0400
commit94aa743a2af455ee3bd9fc3410dff82f6abf4522 (patch)
tree69a029c136ccd4c02321fe96fce5060ef9f935f2 /drivers/scsi/fcoe/fcoe.c
parentf9184df3b99375964340c1a78e33f304bbf15f06 (diff)
downloadlinux-94aa743a2af455ee3bd9fc3410dff82f6abf4522.tar.xz
fcoe: Fix deadlock while deleting FCoE interface with NPIV ports
This patch fixes following deadlock caused by destroying of an FCoE interface with active NPIV ports on that interface. Call Trace: [<ffffffff814b7e88>] schedule+0x64/0x66 [<ffffffff814b6b4f>] schedule_timeout+0x36/0xe3 [<ffffffff81070c55>] ? update_curr+0xd6/0x110 [<ffffffff81071f6b>] ? hrtick_update+0x1b/0x4d [<ffffffff81072405>] ? dequeue_task_fair+0x1ca/0x1d9 [<ffffffff8106a369>] ? need_resched+0x1e/0x28 [<ffffffff814b7d14>] wait_for_common+0x9b/0xf1 [<ffffffff8106e7be>] ? try_to_wake_up+0x1e0/0x1e0 [<ffffffff814b7e22>] wait_for_completion+0x1d/0x1f [<ffffffff8105ae82>] flush_workqueue+0x116/0x2a1 [<ffffffff8105b357>] drain_workqueue+0x66/0x14c [<ffffffff8105b8ef>] destroy_workqueue+0x1a/0xcf [<ffffffffa009211e>] fc_remove_host+0x154/0x17f [scsi_transport_fc] [<ffffffffa00edbb8>] fcoe_if_destroy+0x184/0x1c9 [fcoe] [<ffffffffa00edc28>] fcoe_destroy_work+0x2b/0x44 [fcoe] [<ffffffff8105a82a>] process_one_work+0x1a8/0x2a4 [<ffffffffa00edbfd>] ? fcoe_if_destroy+0x1c9/0x1c9 [fcoe] [<ffffffff8105c396>] worker_thread+0x1db/0x268 [<ffffffff810604a3>] ? wake_up_bit+0x2a/0x2a [<ffffffff8105c1bb>] ? manage_workers.clone.16+0x1f6/0x1f6 [<ffffffff8105ffd6>] kthread+0x6f/0x77 [<ffffffff814c0304>] kernel_thread_helper+0x4/0x10 [<ffffffff8105ff67>] ? kthread_freezable_should_stop+0x4b/0x4b Call Trace: [<ffffffff814b7e88>] schedule+0x64/0x66 [<ffffffff814b8041>] schedule_preempt_disabled+0xe/0x10 [<ffffffff814b70a1>] __mutex_lock_common.clone.5+0x117/0x17a [<ffffffff814b7117>] __mutex_lock_slowpath+0x13/0x15 [<ffffffff814b6f76>] mutex_lock+0x23/0x37 [<ffffffff8125b890>] ? list_del+0x11/0x30 [<ffffffffa00edc84>] fcoe_vport_destroy+0x43/0x5f [fcoe] [<ffffffffa009130a>] fc_vport_terminate+0x48/0x110 [scsi_transport_fc] [<ffffffffa00913ef>] fc_vport_sched_delete+0x1d/0x79 [scsi_transport_fc] [<ffffffff8105a82a>] process_one_work+0x1a8/0x2a4 [<ffffffffa00913d2>] ? fc_vport_terminate+0x110/0x110 [scsi_transport_fc] [<ffffffff8105c396>] worker_thread+0x1db/0x268 [<ffffffff8105c1bb>] ? manage_workers.clone.16+0x1f6/0x1f6 [<ffffffff8105ffd6>] kthread+0x6f/0x77 [<ffffffff814c0304>] kernel_thread_helper+0x4/0x10 [<ffffffff8105ff67>] ? kthread_freezable_should_stop+0x4b/0x4b [<ffffffff814c0300>] ? gs_change+0x13/0x13 A prior attempt to fix this issue is posted here: http://lists.open-fcoe.org/pipermail/devel/2012-October/012318.html or http://article.gmane.org/gmane.linux.scsi.open-fcoe.devel/11924 Based on feedback and discussion with Neil Horman it seems that the above patch may have a case where the fcoe_vport_destroy() and fcoe_destroy_work() can race; hence that patch has been withdrawn with this patch that is trying to solve the same problem in a different way. In the current approach instead of removing the fcoe_config_mutex from the vport_delete callback function; I've chosen to delete all the NPIV ports first on a given root lport before continuing with the removal of the root lport. Signed-off-by: Neerav Parikh <Neerav.Parikh@intel.com> Tested-by: Marcus Dennis <marcusx.e.dennis@intel.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Robert Love <robert.w.love@intel.com>
Diffstat (limited to 'drivers/scsi/fcoe/fcoe.c')
-rw-r--r--drivers/scsi/fcoe/fcoe.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index d605700f68cb..b5d92fc93c70 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -2196,8 +2196,31 @@ static void fcoe_destroy_work(struct work_struct *work)
{
struct fcoe_port *port;
struct fcoe_interface *fcoe;
+ struct Scsi_Host *shost;
+ struct fc_host_attrs *fc_host;
+ unsigned long flags;
+ struct fc_vport *vport;
+ struct fc_vport *next_vport;
port = container_of(work, struct fcoe_port, destroy_work);
+ shost = port->lport->host;
+ fc_host = shost_to_fc_host(shost);
+
+ /* Loop through all the vports and mark them for deletion */
+ spin_lock_irqsave(shost->host_lock, flags);
+ list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
+ if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
+ continue;
+ } else {
+ vport->flags |= FC_VPORT_DELETING;
+ queue_work(fc_host_work_q(shost),
+ &vport->vport_delete_work);
+ }
+ }
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
+ flush_workqueue(fc_host_work_q(shost));
+
mutex_lock(&fcoe_config_mutex);
fcoe = port->priv;