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RDMA/mlx5: Fix mkey cache WQ flush

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The cited patch tries to ensure no pending works on the mkey cache
workqueue by disabling adding new works and call flush_workqueue().
But this workqueue also has delayed works which might still be pending
the delay time to be queued.

Add cancel_delayed_work() for the delayed works which waits to be queued
and then the flush_workqueue() will flush all works which are already
queued and running.

Fixes: 374012b004 ("RDMA/mlx5: Fix mkey cache possible deadlock on cleanup")
Link: https://lore.kernel.org/r/b8722f14e7ed81452f791764a26d2ed4cfa11478.1698256179.git.leon@kernel.org
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Moshe Shemesh 2023-10-25 20:49:59 +03:00 committed by Jason Gunthorpe
parent 162e348024
commit a53e215f90
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/hw/mlx5/mr.c
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@ -1000,11 +1000,13 @@ void mlx5_mkey_cache_cleanup(struct mlx5_ib_dev *dev)
return;
mutex_lock(&dev->cache.rb_lock);
cancel_delayed_work(&dev->cache.remove_ent_dwork);
for (node = rb_first(root); node; node = rb_next(node)) {
ent = rb_entry(node, struct mlx5_cache_ent, node);
spin_lock_irq(&ent->mkeys_queue.lock);
ent->disabled = true;
spin_unlock_irq(&ent->mkeys_queue.lock);
cancel_delayed_work(&ent->dwork);
}
mutex_unlock(&dev->cache.rb_lock);