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| author | Dan Williams <dan.j.williams@intel.com> | 2016-10-27 17:04:05 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-10-27 17:04:05 -0700 |
| commit | 52e73eb2872c9af6f382b2b22954ca8214397a4e (patch) | |
| tree | 535f1b0672bf4b1ad826a67e26437441ead156c7 /Documentation | |
| parent | 867dfe342118b1ea0256a85f7c0d9ceb0ead032a (diff) | |
device-dax: fix percpu_ref_exit ordering
We need to wait until the percpu_ref is released before exit. Otherwise,
we sometimes lose the race and trigger this new warning that was added
in v4.9 (commit a67823c1ed10 "percpu-refcount: init ->confirm_switch
member properly"):
WARNING: CPU: 0 PID: 3629 at lib/percpu-refcount.c:107 percpu_ref_exit+0x51/0x60
[..]
Call Trace:
[<ffffffff814bf093>] dump_stack+0x85/0xc2
[<ffffffff810b15db>] __warn+0xcb/0xf0
[<ffffffff810b170d>] warn_slowpath_null+0x1d/0x20
[<ffffffff814d70c1>] percpu_ref_exit+0x51/0x60
[<ffffffffa005706a>] dax_pmem_percpu_exit+0x1a/0x50 [dax_pmem]
[<ffffffff81615f1f>] devm_action_release+0xf/0x20
Cc: <stable@vger.kernel.org>
Fixes: ab68f2622136 ("/dev/dax, pmem: direct access to persistent memory")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions