aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/sw/rxe/rxe_verbs.c
diff options
context:
space:
mode:
authorParvi Kaustubhi <pkaustub@cisco.com>2019-02-09 09:28:30 -0800
committerJason Gunthorpe <jgg@mellanox.com>2019-02-19 20:52:19 -0700
commit5bb3c1e9d4bc93a9eb4e44a52582d6aa72643b1e (patch)
treed2752199cb84ced4f13a903b912fdf2a917a7ba6 /drivers/infiniband/sw/rxe/rxe_verbs.c
parentRDMA/rxe: Close a race after ib_register_device (diff)
downloadlinux-dev-5bb3c1e9d4bc93a9eb4e44a52582d6aa72643b1e.tar.xz
linux-dev-5bb3c1e9d4bc93a9eb4e44a52582d6aa72643b1e.zip
IB/usnic: Fix deadlock
There is a dead lock in usnic ib_register and netdev_notify path. usnic_ib_discover_pf() | mutex_lock(&usnic_ib_ibdev_list_lock); | usnic_ib_device_add(); | ib_register_device() | usnic_ib_query_port() | mutex_lock(&us_ibdev->usdev_lock); | ib_get_eth_speed() | rtnl_lock() order of lock: &usnic_ib_ibdev_list_lock -> usdev_lock -> rtnl_lock rtnl_lock() | usnic_ib_netdevice_event() | mutex_lock(&usnic_ib_ibdev_list_lock); order of lock: rtnl_lock -> &usnic_ib_ibdev_list_lock Solution is to use the core's lock-free ib_device_get_by_netdev() scheme to lookup ib_dev while handling netdev & inet events. Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com> Reviewed-by: Govindarajulu Varadarajan <gvaradar@cisco.com> Reviewed-by: Tanmay Inamdar <tinamdar@cisco.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_verbs.c')
0 files changed, 0 insertions, 0 deletions