From: =?UTF-8?q?H=C3=A5kon=20Bugge?= <haakon.bugge@oracle.com>
Date: Wed, 18 Apr 2018 16:24:50 +0200
Subject: IB/core: Make ib_mad_client_id atomic
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Patch-mainline: v4.17-rc4
Git-commit: db82476f37413eaeff5f836a9d8b022d6544accf
References: bsc#1046306 FATE#322942
Currently, the kernel protects access to the agent ID allocator on a per
port basis using a spinlock, so it is impossible for two apps/threads on
the same port to get the same TID, but it is entirely possible for two
threads on different ports to end up with the same TID.
As this can be confusing (regardless of it being legal according to the
IB Spec 1.3, C13-18.1.1, in section 13.4.6.4 - TransactionID usage),
and as the rdma-core user space API for /dev/umad devices implies unique
TIDs even across ports, make the TID an atomic type so that no two
allocations, regardless of port number, will be the same.
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/mad.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -60,7 +60,7 @@ module_param_named(recv_queue_size, mad_
MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
static struct list_head ib_mad_port_list;
-static u32 ib_mad_client_id = 0;
+static atomic_t ib_mad_client_id = ATOMIC_INIT(0);
/* Port list lock */
static DEFINE_SPINLOCK(ib_mad_port_list_lock);
@@ -378,7 +378,7 @@ struct ib_mad_agent *ib_register_mad_age
}
spin_lock_irqsave(&port_priv->reg_lock, flags);
- mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
+ mad_agent_priv->agent.hi_tid = atomic_inc_return(&ib_mad_client_id);
/*
* Make sure MAD registration (if supplied)