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Date: Fri, 14 Jan 2022 12:12:18 -0500
From: John Meneghini <jmeneghi@...hat.com>
To: GR-QLogic-Storage-Upstream@...vell.com
Cc: linux-kernel@...r.kernel.org, mlombard@...hat.com,
skashyap@...vell.com, linux-scsi@...r.kernel.org
Subject: Re: [PATCH V2] scsi: bnx2fc: flush destroy_work queue before calling
bnx2fc_interface_put
After looking at the original patch more closely, Maurizio suggested that we
just remove the destroy_work queue all together.
This has been fully tested on more than one testbed and our QE dept. has verified
this patch fixes the problem.
Please review/approve. We'd like to get this into v5.17-rc1
Thanks,
/John
On 1/14/22 12:04, John Meneghini wrote:
> The bnx2fc_destroy functions are removing the interface before calling
> destroy_work. This results multiple WARNings from sysfs_remove_group
> as the controller rport device attributes are removed to early.
>
> Replace the fcoe_port's destroy_work queue. It's not needed.
>
> The problem is easily reproducible with the following steps.
>
> Example:
>
> $ dmesg -w &
> $ systemctl enable --now fcoe
> $ fipvlan -s -c ens2f1
> $ fcoeadm -d ens2f1.802
> [ 583.464488] host2: libfc: Link down on port (7500a1)
> [ 583.472651] bnx2fc: 7500a1 - rport not created Yet!!
> [ 583.490468] ------------[ cut here ]------------
> [ 583.538725] sysfs group 'power' not found for kobject 'rport-2:0-0'
> [ 583.568814] WARNING: CPU: 3 PID: 192 at fs/sysfs/group.c:279 sysfs_remove_group+0x6f/0x80
> [ 583.607130] Modules linked in: dm_service_time 8021q garp mrp stp llc bnx2fc cnic uio rpcsec_gss_krb5 auth_rpcgss nfsv4 ...
> [ 583.942994] CPU: 3 PID: 192 Comm: kworker/3:2 Kdump: loaded Not tainted 5.14.0-39.el9.x86_64 #1
> [ 583.984105] Hardware name: HP ProLiant DL120 G7, BIOS J01 07/01/2013
> [ 584.016535] Workqueue: fc_wq_2 fc_rport_final_delete [scsi_transport_fc]
> [ 584.050691] RIP: 0010:sysfs_remove_group+0x6f/0x80
> [ 584.074725] Code: ff 5b 48 89 ef 5d 41 5c e9 ee c0 ff ff 48 89 ef e8 f6 b8 ff ff eb d1 49 8b 14 24 48 8b 33 48 c7 c7 ...
> [ 584.162586] RSP: 0018:ffffb567c15afdc0 EFLAGS: 00010282
> [ 584.188225] RAX: 0000000000000000 RBX: ffffffff8eec4220 RCX: 0000000000000000
> [ 584.221053] RDX: ffff8c1586ce84c0 RSI: ffff8c1586cd7cc0 RDI: ffff8c1586cd7cc0
> [ 584.255089] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb567c15afc00
> [ 584.287954] R10: ffffb567c15afbf8 R11: ffffffff8fbe7f28 R12: ffff8c1486326400
> [ 584.322356] R13: ffff8c1486326480 R14: ffff8c1483a4a000 R15: 0000000000000004
> [ 584.355379] FS: 0000000000000000(0000) GS:ffff8c1586cc0000(0000) knlGS:0000000000000000
> [ 584.394419] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 584.421123] CR2: 00007fe95a6f7840 CR3: 0000000107674002 CR4: 00000000000606e0
> [ 584.454888] Call Trace:
> [ 584.466108] device_del+0xb2/0x3e0
> [ 584.481701] device_unregister+0x13/0x60
> [ 584.501306] bsg_unregister_queue+0x5b/0x80
> [ 584.522029] bsg_remove_queue+0x1c/0x40
> [ 584.541884] fc_rport_final_delete+0xf3/0x1d0 [scsi_transport_fc]
> [ 584.573823] process_one_work+0x1e3/0x3b0
> [ 584.592396] worker_thread+0x50/0x3b0
> [ 584.609256] ? rescuer_thread+0x370/0x370
> [ 584.628877] kthread+0x149/0x170
> [ 584.643673] ? set_kthread_struct+0x40/0x40
> [ 584.662909] ret_from_fork+0x22/0x30
> [ 584.680002] ---[ end trace 53575ecefa942ece ]---
>
> Signed-off-by: John Meneghini <jmeneghi@...hat.com>
> Signed-off-by: Maurizio Lombardi <mlombard@...hat.com>
> ---
> drivers/scsi/bnx2fc/bnx2fc_fcoe.c | 20 +++++---------------
> 1 file changed, 5 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
> index 71fa62bd3083..9be273c320e2 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
> @@ -82,7 +82,7 @@ static int bnx2fc_bind_pcidev(struct bnx2fc_hba *hba);
> static void bnx2fc_unbind_pcidev(struct bnx2fc_hba *hba);
> static struct fc_lport *bnx2fc_if_create(struct bnx2fc_interface *interface,
> struct device *parent, int npiv);
> -static void bnx2fc_destroy_work(struct work_struct *work);
> +static void bnx2fc_port_destroy(struct fcoe_port *port);
>
> static struct bnx2fc_hba *bnx2fc_hba_lookup(struct net_device *phys_dev);
> static struct bnx2fc_interface *bnx2fc_interface_lookup(struct net_device
> @@ -907,9 +907,6 @@ static void bnx2fc_indicate_netevent(void *context, unsigned long event,
> __bnx2fc_destroy(interface);
> }
> mutex_unlock(&bnx2fc_dev_lock);
> -
> - /* Ensure ALL destroy work has been completed before return */
> - flush_workqueue(bnx2fc_wq);
> return;
>
> default:
> @@ -1215,8 +1212,8 @@ static int bnx2fc_vport_destroy(struct fc_vport *vport)
> mutex_unlock(&n_port->lp_mutex);
> bnx2fc_free_vport(interface->hba, port->lport);
> bnx2fc_port_shutdown(port->lport);
> + bnx2fc_port_destroy(port);
> bnx2fc_interface_put(interface);
> - queue_work(bnx2fc_wq, &port->destroy_work);
> return 0;
> }
>
> @@ -1525,7 +1522,6 @@ static struct fc_lport *bnx2fc_if_create(struct bnx2fc_interface *interface,
> port->lport = lport;
> port->priv = interface;
> port->get_netdev = bnx2fc_netdev;
> - INIT_WORK(&port->destroy_work, bnx2fc_destroy_work);
>
> /* Configure fcoe_port */
> rc = bnx2fc_lport_config(lport);
> @@ -1653,8 +1649,8 @@ static void __bnx2fc_destroy(struct bnx2fc_interface *interface)
> bnx2fc_interface_cleanup(interface);
> bnx2fc_stop(interface);
> list_del(&interface->list);
> + bnx2fc_port_destroy(port);
> bnx2fc_interface_put(interface);
> - queue_work(bnx2fc_wq, &port->destroy_work);
> }
>
> /**
> @@ -1694,15 +1690,12 @@ static int bnx2fc_destroy(struct net_device *netdev)
> return rc;
> }
>
> -static void bnx2fc_destroy_work(struct work_struct *work)
> +static void bnx2fc_port_destroy(struct fcoe_port *port)
> {
> - struct fcoe_port *port;
> struct fc_lport *lport;
>
> - port = container_of(work, struct fcoe_port, destroy_work);
> lport = port->lport;
> -
> - BNX2FC_HBA_DBG(lport, "Entered bnx2fc_destroy_work\n");
> + BNX2FC_HBA_DBG(lport, "Entered %s, destroying lport %p\n", __func__, lport);
>
> bnx2fc_if_destroy(lport);
> }
> @@ -2556,9 +2549,6 @@ static void bnx2fc_ulp_exit(struct cnic_dev *dev)
> __bnx2fc_destroy(interface);
> mutex_unlock(&bnx2fc_dev_lock);
>
> - /* Ensure ALL destroy work has been completed before return */
> - flush_workqueue(bnx2fc_wq);
> -
> bnx2fc_ulp_stop(hba);
> /* unregister cnic device */
> if (test_and_clear_bit(BNX2FC_CNIC_REGISTERED, &hba->reg_with_cnic))
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