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| author | Nitzan Carmi | 2018-04-09 16:50:26 +0200 |
|---|---|---|
| committer | Paul E. McKenney | 2018-05-15 19:28:03 +0200 |
| commit | 4317228ad9b86f094d70c951f9210a8a9b2816be (patch) | |
| tree | 6926b575d7c3fa2d091c13be18544fbc76109551 /kernel/rcu | |
| parent | srcu: Add cleanup_srcu_struct_quiesced() (diff) | |
| download | kernel-qcow2-linux-4317228ad9b86f094d70c951f9210a8a9b2816be.tar.gz kernel-qcow2-linux-4317228ad9b86f094d70c951f9210a8a9b2816be.tar.xz kernel-qcow2-linux-4317228ad9b86f094d70c951f9210a8a9b2816be.zip | |
nvme: Avoid flush dependency in delete controller flow
The nvme_delete_ctrl() function queues a work item on a MEM_RECLAIM
queue (nvme_delete_wq), which eventually calls cleanup_srcu_struct(),
which in turn flushes a delayed work from an !MEM_RECLAIM queue. This
is unsafe as we might trigger deadlocks under severe memory pressure.
Since we don't ever invoke call_srcu(), it is safe to use the shiny new
_quiesced() version of srcu cleanup, thus avoiding that flush dependency.
This commit makes that change.
Signed-off-by: Nitzan Carmi <nitzanc@mellanox.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>
Diffstat (limited to 'kernel/rcu')
0 files changed, 0 insertions, 0 deletions