linux/drivers/infiniband
Jason Gunthorpe e8dc4e885c RDMA/cm: Fix ordering of xa_alloc_cyclic() in ib_create_cm_id()
xa_alloc_cyclic() is a SMP release to be paired with some later acquire
during xa_load() as part of cm_acquire_id().

As such, xa_alloc_cyclic() must be done after the cm_id is fully
initialized, in particular, it absolutely must be after the
refcount_set(), otherwise the refcount_inc() in cm_acquire_id() may not
see the set.

As there are several cases where a reader will be able to use the
id.local_id after cm_acquire_id in the IB_CM_IDLE state there needs to be
an unfortunate split into a NULL allocate and a finalizing xa_store.

Fixes: a977049dac ("[PATCH] IB: Add the kernel CM implementation")
Link: https://lore.kernel.org/r/20200310092545.251365-2-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2020-03-17 17:05:51 -03:00
..
core RDMA/cm: Fix ordering of xa_alloc_cyclic() in ib_create_cm_id() 2020-03-17 17:05:51 -03:00
hw RDMA/hns: Fix wrong judgments of udata->outlen 2020-03-13 11:36:58 -03:00
sw Linux 5.6-rc5 2020-03-10 12:49:09 -03:00
ulp Linux 5.6-rc4 2020-03-04 13:11:06 -04:00
Kconfig RDMA/iw_cxgb3: Remove the iw_cxgb3 module from kernel 2019-10-04 15:08:59 -03:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00