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RDMA/bnxt_re: Avoid system hang during device un-reg 

BNXT_RE_FLAG_TASK_IN_PROG doesn't handle multiple work
requests posted together. Track schedule of multiple
workqueue items by maintaining a per device counter
and proceed with IB dereg only if this counter is zero.
flush_workqueue is no longer required from
NETDEV_UNREGISTER path.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Selvin Xavier 2018-02-15 21:20:13 -08:00 committed by Doug Ledford
parent dcdaba0806
commit 7374fbd9e1
2 changed files with 4 additions and 5 deletions
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2
drivers/infiniband/hw/bnxt_re/bnxt_re.h
View File

@ -120,7 +120,6 @@ struct bnxt_re_dev {
#define BNXT_RE_FLAG_HAVE_L2_REF 3
#define BNXT_RE_FLAG_RCFW_CHANNEL_EN 4
#define BNXT_RE_FLAG_QOS_WORK_REG 5
#define BNXT_RE_FLAG_TASK_IN_PROG 6
#define BNXT_RE_FLAG_ISSUE_ROCE_STATS 29
struct net_device *netdev;
unsigned int version, major, minor;
@ -158,6 +157,7 @@ struct bnxt_re_dev {
atomic_t srq_count;
atomic_t mr_count;
atomic_t mw_count;
atomic_t sched_count;
/* Max of 2 lossless traffic class supported per port */
u16 cosq[2];

7
drivers/infiniband/hw/bnxt_re/main.c
View File

@ -656,7 +656,6 @@ static void bnxt_re_dev_remove(struct bnxt_re_dev *rdev)
mutex_unlock(&bnxt_re_dev_lock);
synchronize_rcu();
flush_workqueue(bnxt_re_wq);
ib_dealloc_device(&rdev->ibdev);
/* rdev is gone */
@ -1441,7 +1440,7 @@ static void bnxt_re_task(struct work_struct *work)
break;
}
smp_mb__before_atomic();
clear_bit(BNXT_RE_FLAG_TASK_IN_PROG, &rdev->flags);
atomic_dec(&rdev->sched_count);
kfree(re_work);
}
@ -1503,7 +1502,7 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier,
/* netdev notifier will call NETDEV_UNREGISTER again later since
* we are still holding the reference to the netdev
*/
if (test_bit(BNXT_RE_FLAG_TASK_IN_PROG, &rdev->flags))
if (atomic_read(&rdev->sched_count) > 0)
goto exit;
bnxt_re_ib_unreg(rdev, false);
bnxt_re_remove_one(rdev);
@ -1523,7 +1522,7 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier,
re_work->vlan_dev = (real_dev == netdev ?
NULL : netdev);
INIT_WORK(&re_work->work, bnxt_re_task);
set_bit(BNXT_RE_FLAG_TASK_IN_PROG, &rdev->flags);
atomic_inc(&rdev->sched_count);
queue_work(bnxt_re_wq, &re_work->work);
}
}