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scsi: qla2xxx: Fix hardirq-unsafe locking
Since fc_remote_port_delete() must be called with interrupts enabled, do
not disable interrupts when calling that function. Remove the lockin calls
from around the put_sess() call. This is safe because the function that is
called when the final reference is dropped, qlt_unreg_sess(), grabs the
proper locks. This patch avoids that lockdep reports the following:
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
kworker/2:1/62 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
0000000009e679b3 (&(&k->k_lock)->rlock){+.+.}, at: klist_next+0x43/0x1d0
and this task is already holding:
00000000a033b71c (&(&ha->tgt.sess_lock)->rlock){-...}, at: qla24xx_delete_sess_fn+0x55/0xf0 [qla2xxx_scst]
which would create a new lock dependency:
(&(&ha->tgt.sess_lock)->rlock){-...} -> (&(&k->k_lock)->rlock){+.+.}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&(&ha->tgt.sess_lock)->rlock){-...}
... which became HARDIRQ-irq-safe at:
lock_acquire+0xe3/0x200
_raw_spin_lock_irqsave+0x3d/0x60
qla24xx_report_id_acquisition+0xa69/0xe30 [qla2xxx_scst]
qla24xx_process_response_queue+0x69e/0x1270 [qla2xxx_scst]
qla24xx_msix_rsp_q+0x79/0xf0 [qla2xxx_scst]
__handle_irq_event_percpu+0x79/0x3c0
handle_irq_event_percpu+0x70/0xf0
handle_irq_event+0x5a/0x8b
handle_edge_irq+0x12c/0x310
handle_irq+0x192/0x20a
do_IRQ+0x73/0x160
ret_from_intr+0x0/0x1d
default_idle+0x23/0x1f0
arch_cpu_idle+0x15/0x20
default_idle_call+0x35/0x40
do_idle+0x2bb/0x2e0
cpu_startup_entry+0x1d/0x20
start_secondary+0x2a8/0x320
secondary_startup_64+0xa4/0xb0
to a HARDIRQ-irq-unsafe lock:
(&(&k->k_lock)->rlock){+.+.}
... which became HARDIRQ-irq-unsafe at:
...
lock_acquire+0xe3/0x200
_raw_spin_lock+0x32/0x50
klist_add_tail+0x33/0xb0
device_add+0x7e1/0xb50
device_create_groups_vargs+0x11c/0x150
device_create_with_groups+0x89/0xb0
vtconsole_class_init+0xb2/0x124
do_one_initcall+0xc5/0x3ce
kernel_init_freeable+0x295/0x32e
kernel_init+0x11/0x11b
ret_from_fork+0x3a/0x50
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&k->k_lock)->rlock);
local_irq_disable();
lock(&(&ha->tgt.sess_lock)->rlock);
lock(&(&k->k_lock)->rlock);
<Interrupt>
lock(&(&ha->tgt.sess_lock)->rlock);
*** DEADLOCK ***
3 locks held by kworker/2:1/62:
#0: 00000000a4319c16 ((wq_completion)"qla2xxx_wq"){+.+.}, at: process_one_work+0x437/0xa80
#1: 00000000ffa34c42 ((work_completion)(&sess->del_work)){+.+.}, at: process_one_work+0x437/0xa80
#2: 00000000a033b71c (&(&ha->tgt.sess_lock)->rlock){-...}, at: qla24xx_delete_sess_fn+0x55/0xf0 [qla2xxx_scst]
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&(&ha->tgt.sess_lock)->rlock){-...} ops: 8 {
IN-HARDIRQ-W at:
lock_acquire+0xe3/0x200
_raw_spin_lock_irqsave+0x3d/0x60
qla24xx_report_id_acquisition+0xa69/0xe30 [qla2xxx_scst]
qla24xx_process_response_queue+0x69e/0x1270 [qla2xxx_scst]
qla24xx_msix_rsp_q+0x79/0xf0 [qla2xxx_scst]
__handle_irq_event_percpu+0x79/0x3c0
handle_irq_event_percpu+0x70/0xf0
handle_irq_event+0x5a/0x8b
handle_edge_irq+0x12c/0x310
handle_irq+0x192/0x20a
do_IRQ+0x73/0x160
ret_from_intr+0x0/0x1d
default_idle+0x23/0x1f0
arch_cpu_idle+0x15/0x20
default_idle_call+0x35/0x40
do_idle+0x2bb/0x2e0
cpu_startup_entry+0x1d/0x20
start_secondary+0x2a8/0x320
secondary_startup_64+0xa4/0xb0
INITIAL USE at:
lock_acquire+0xe3/0x200
_raw_spin_lock_irqsave+0x3d/0x60
qla24xx_report_id_acquisition+0xa69/0xe30 [qla2xxx_scst]
qla24xx_process_response_queue+0x69e/0x1270 [qla2xxx_scst]
qla24xx_msix_rsp_q+0x79/0xf0 [qla2xxx_scst]
__handle_irq_event_percpu+0x79/0x3c0
handle_irq_event_percpu+0x70/0xf0
handle_irq_event+0x5a/0x8b
handle_edge_irq+0x12c/0x310
handle_irq+0x192/0x20a
do_IRQ+0x73/0x160
ret_from_intr+0x0/0x1d
default_idle+0x23/0x1f0
arch_cpu_idle+0x15/0x20
default_idle_call+0x35/0x40
do_idle+0x2bb/0x2e0
cpu_startup_entry+0x1d/0x20
start_secondary+0x2a8/0x320
secondary_startup_64+0xa4/0xb0
}
... key at: [<ffffffffa0c0d080>] __key.85462+0x0/0xfffffffffff7df80 [qla2xxx_scst]
... acquired at:
lock_acquire+0xe3/0x200
_raw_spin_lock_irqsave+0x3d/0x60
klist_next+0x43/0x1d0
device_for_each_child+0x96/0x110
scsi_target_block+0x3c/0x40 [scsi_mod]
fc_remote_port_delete+0xe7/0x1c0 [scsi_transport_fc]
qla2x00_mark_device_lost+0xa0b/0xa30 [qla2xxx_scst]
qlt_unreg_sess+0x1c6/0x380 [qla2xxx_scst]
qla24xx_delete_sess_fn+0xe6/0xf0 [qla2xxx_scst]
process_one_work+0x511/0xa80
worker_thread+0x67/0x5b0
kthread+0x1d2/0x1f0
ret_from_fork+0x3a/0x50
the dependencies between the lock to be acquired
and HARDIRQ-irq-unsafe lock:
-> (&(&k->k_lock)->rlock){+.+.} ops: 13831 {
HARDIRQ-ON-W at:
lock_acquire+0xe3/0x200
_raw_spin_lock+0x32/0x50
klist_add_tail+0x33/0xb0
device_add+0x7e1/0xb50
device_create_groups_vargs+0x11c/0x150
device_create_with_groups+0x89/0xb0
vtconsole_class_init+0xb2/0x124
do_one_initcall+0xc5/0x3ce
kernel_init_freeable+0x295/0x32e
kernel_init+0x11/0x11b
ret_from_fork+0x3a/0x50
SOFTIRQ-ON-W at:
lock_acquire+0xe3/0x200
_raw_spin_lock+0x32/0x50
klist_add_tail+0x33/0xb0
device_add+0x7e1/0xb50
device_create_groups_vargs+0x11c/0x150
device_create_with_groups+0x89/0xb0
vtconsole_class_init+0xb2/0x124
do_one_initcall+0xc5/0x3ce
kernel_init_freeable+0x295/0x32e
kernel_init+0x11/0x11b
ret_from_fork+0x3a/0x50
INITIAL USE at:
lock_acquire+0xe3/0x200
_raw_spin_lock+0x32/0x50
klist_add_tail+0x33/0xb0
device_add+0x7e1/0xb50
device_create_groups_vargs+0x11c/0x150
device_create_with_groups+0x89/0xb0
vtconsole_class_init+0xb2/0x124
do_one_initcall+0xc5/0x3ce
kernel_init_freeable+0x295/0x32e
kernel_init+0x11/0x11b
ret_from_fork+0x3a/0x50
}
... key at: [<ffffffff83ed8780>] __key.15491+0x0/0x40
... acquired at:
lock_acquire+0xe3/0x200
_raw_spin_lock_irqsave+0x3d/0x60
klist_next+0x43/0x1d0
device_for_each_child+0x96/0x110
scsi_target_block+0x3c/0x40 [scsi_mod]
fc_remote_port_delete+0xe7/0x1c0 [scsi_transport_fc]
qla2x00_mark_device_lost+0xa0b/0xa30 [qla2xxx_scst]
qlt_unreg_sess+0x1c6/0x380 [qla2xxx_scst]
qla24xx_delete_sess_fn+0xe6/0xf0 [qla2xxx_scst]
process_one_work+0x511/0xa80
worker_thread+0x67/0x5b0
kthread+0x1d2/0x1f0
ret_from_fork+0x3a/0x50
stack backtrace:
CPU: 2 PID: 62 Comm: kworker/2:1 Tainted: G O 5.0.7-dbg+ #8
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
Workqueue: qla2xxx_wq qla24xx_delete_sess_fn [qla2xxx_scst]
Call Trace:
dump_stack+0x86/0xca
check_usage.cold.52+0x473/0x563
__lock_acquire+0x11c0/0x23e0
lock_acquire+0xe3/0x200
_raw_spin_lock_irqsave+0x3d/0x60
klist_next+0x43/0x1d0
device_for_each_child+0x96/0x110
scsi_target_block+0x3c/0x40 [scsi_mod]
fc_remote_port_delete+0xe7/0x1c0 [scsi_transport_fc]
qla2x00_mark_device_lost+0xa0b/0xa30 [qla2xxx_scst]
qlt_unreg_sess+0x1c6/0x380 [qla2xxx_scst]
qla24xx_delete_sess_fn+0xe6/0xf0 [qla2xxx_scst]
process_one_work+0x511/0xa80
worker_thread+0x67/0x5b0
kthread+0x1d2/0x1f0
ret_from_fork+0x3a/0x50
Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Giridhar Malavali <gmalavali@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche
Martin K. Petersen
parent
db4bf822c5
commit
300ec7415c
@ -682,7 +682,6 @@ int qla24xx_async_notify_ack(scsi_qla_host_t *vha, fc_port_t *fcport,
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void qla24xx_do_nack_work(struct scsi_qla_host *vha, struct qla_work_evt *e)
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{
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fc_port_t *t;
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unsigned long flags;
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switch (e->u.nack.type) {
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case SRB_NACK_PRLI:
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@ -695,10 +694,8 @@ void qla24xx_do_nack_work(struct scsi_qla_host *vha, struct qla_work_evt *e)
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if (t) {
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ql_log(ql_log_info, vha, 0xd034,
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"%s create sess success %p", __func__, t);
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spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
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/* create sess has an extra kref */
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vha->hw->tgt.tgt_ops->put_sess(e->u.nack.fcport);
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spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
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}
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break;
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}
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@ -710,9 +707,6 @@ void qla24xx_delete_sess_fn(struct work_struct *work)
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{
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fc_port_t *fcport = container_of(work, struct fc_port, del_work);
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struct qla_hw_data *ha = fcport->vha->hw;
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unsigned long flags;
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spin_lock_irqsave(&ha->tgt.sess_lock, flags);
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if (fcport->se_sess) {
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ha->tgt.tgt_ops->shutdown_sess(fcport);
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@ -720,7 +714,6 @@ void qla24xx_delete_sess_fn(struct work_struct *work)
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} else {
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qlt_unreg_sess(fcport);
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}
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
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}
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/*
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@ -789,8 +782,9 @@ void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
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fcport->port_name, sess->loop_id);
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sess->local = 0;
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}
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
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ha->tgt.tgt_ops->put_sess(sess);
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}
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/*
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@ -4175,9 +4169,7 @@ static void __qlt_do_work(struct qla_tgt_cmd *cmd)
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/*
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* Drop extra session reference from qlt_handle_cmd_for_atio().
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*/
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spin_lock_irqsave(&ha->tgt.sess_lock, flags);
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
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return;
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out_term:
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@ -4194,9 +4186,7 @@ static void __qlt_do_work(struct qla_tgt_cmd *cmd)
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target_free_tag(sess->se_sess, &cmd->se_cmd);
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spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
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spin_lock_irqsave(&ha->tgt.sess_lock, flags);
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
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}
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static void qlt_do_work(struct work_struct *work)
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@ -4405,9 +4395,7 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
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if (!cmd) {
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ql_dbg(ql_dbg_io, vha, 0x3062,
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"qla_target(%d): Allocation of cmd failed\n", vha->vp_idx);
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spin_lock_irqsave(&ha->tgt.sess_lock, flags);
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
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return -EBUSY;
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}
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@ -6258,17 +6246,19 @@ static void qlt_abort_work(struct qla_tgt *tgt,
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}
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rc = __qlt_24xx_handle_abts(vha, &prm->abts, sess);
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
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ha->tgt.tgt_ops->put_sess(sess);
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if (rc != 0)
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goto out_term;
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return;
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out_term2:
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
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if (sess)
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
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out_term:
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spin_lock_irqsave(&ha->hardware_lock, flags);
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@ -6326,9 +6316,10 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
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scsilun_to_int((struct scsi_lun *)&a->u.isp24.fcp_cmnd.lun);
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rc = qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
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ha->tgt.tgt_ops->put_sess(sess);
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spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
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ha->tgt.tgt_ops->put_sess(sess);
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if (rc != 0)
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goto out_term;
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return;
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@ -340,7 +340,6 @@ static void tcm_qla2xxx_put_sess(struct fc_port *sess)
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if (!sess)
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return;
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assert_spin_locked(&sess->vha->hw->tgt.sess_lock);
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kref_put(&sess->sess_kref, tcm_qla2xxx_release_session);
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}
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@ -798,7 +797,6 @@ static void tcm_qla2xxx_clear_nacl_from_fcport_map(struct fc_port *sess)
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static void tcm_qla2xxx_shutdown_sess(struct fc_port *sess)
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{
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assert_spin_locked(&sess->vha->hw->tgt.sess_lock);
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target_sess_cmd_list_set_waiting(sess->se_sess);
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}
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