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RDMA/cm: Add a note explaining how the timewait is eventually freed

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The way the cm_timewait_info is converted into a work and then freed
is very subtle and surprising, add a note clarifying the lifetime
here.

Link: https://lore.kernel.org/r/20200506074701.9775-7-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2020-05-06 10:46:57 +03:00
parent 9767a27e1a
commit 09fb406a56
1 changed files with 5 additions and 0 deletions
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5
drivers/infiniband/core/cm.c
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@ -1025,6 +1025,11 @@ static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
msecs_to_jiffies(wait_time));
spin_unlock_irqrestore(&cm.lock, flags);
/*
* The timewait_info is converted into a work and gets freed during
* cm_free_work() in cm_timewait_handler().
*/
BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
cm_id_priv->timewait_info = NULL;
}