This is a note to let you know that I've just added the patch titled
IB/core: Properly handle registration of on-demand paging MRs after dereg
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-core-properly-handle-registration-of-on-demand-paging-mrs-after-dereg.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4fc701ead77ede96df3e8b3de13fdf2b1326ee5b Mon Sep 17 00:00:00 2001
From: Haggai Eran <haggaie@xxxxxxxxxxxx>
Date: Tue, 6 Jan 2015 13:56:02 +0200
Subject: IB/core: Properly handle registration of on-demand paging MRs after dereg
From: Haggai Eran <haggaie@xxxxxxxxxxxx>
commit 4fc701ead77ede96df3e8b3de13fdf2b1326ee5b upstream.
When the last on-demand paging MR is released the notifier count is
left non-zero so that concurrent page faults will have to abort. If a
new MR is then registered, the counter is reset. However, the decision
is made to put the new MR in the list waiting for the notifier count
to reach zero, before the counter is reset. An invalidation or another
MR registration can release the MR to handle page faults, but without
such an event the MR can wait forever.
The patch fixes this issue by adding a check whether the MR is the
first on-demand paging MR when deciding whether it is ready to handle
page faults. If it is the first MR, we know that there are no mmu
notifiers running in parallel to the registration.
Fixes: 882214e2b128 ("IB/core: Implement support for MMU notifiers regarding on demand paging regions")
Signed-off-by: Haggai Eran <haggaie@xxxxxxxxxxxx>
Signed-off-by: Shachar Raindel <raindel@xxxxxxxxxxxx>
Signed-off-by: Roland Dreier <roland@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/umem_odp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/infiniband/core/umem_odp.c
+++ b/drivers/infiniband/core/umem_odp.c
@@ -294,7 +294,8 @@ int ib_umem_odp_get(struct ib_ucontext *
if (likely(ib_umem_start(umem) != ib_umem_end(umem)))
rbt_ib_umem_insert(&umem->odp_data->interval_tree,
&context->umem_tree);
- if (likely(!atomic_read(&context->notifier_count)))
+ if (likely(!atomic_read(&context->notifier_count)) ||
+ context->odp_mrs_count == 1)
umem->odp_data->mn_counters_active = true;
else
list_add(&umem->odp_data->no_private_counters,
Patches currently in stable-queue which might be from haggaie@xxxxxxxxxxxx are
queue-3.19/ib-core-properly-handle-registration-of-on-demand-paging-mrs-after-dereg.patch
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