On Wed, 2019-07-17 at 18:08 -0700, Dan Williams wrote:
Namespace activation expects to be able to reference region badblocks. The following warning sometimes triggers when asynchronous namespace activation races in front of the completion of namespace probing. Move all possible namespace probing after region badblocks initialization.
Otherwise, lockdep sometimes catches the uninitialized state of the badblocks seqlock with stack trace signatures like:
INFO: trying to register non-static key. pmem2: detected capacity change from 0 to 136365211648 the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 9 PID: 358 Comm: kworker/u80:5 Tainted:G OE 5.2.0-rc4+ #3382 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 Workqueue: events_unbound async_run_entry_fn Call Trace: dump_stack+0x85/0xc0 pmem1.12: detected capacity change from 0 to 8589934592 register_lock_class+0x56a/0x570 ? check_object+0x140/0x270 __lock_acquire+0x80/0x1710 ? __mutex_lock+0x39d/0x910 lock_acquire+0x9e/0x180 ? nd_pfn_validate+0x28f/0x440 [libnvdimm] badblocks_check+0x93/0x1f0 ? nd_pfn_validate+0x28f/0x440 [libnvdimm] nd_pfn_validate+0x28f/0x440 [libnvdimm] ? lockdep_hardirqs_on+0xf0/0x180 nd_dax_probe+0x9a/0x120 [libnvdimm] nd_pmem_probe+0x6d/0x180 [nd_pmem] nvdimm_bus_probe+0x90/0x2c0 [libnvdimm]
Fixes: 48af2f7e52f4 ("libnvdimm, pfn: during init, clear errors...") Cc: stable@vger.kernel.org Cc: Vishal Verma vishal.l.verma@intel.com Signed-off-by: Dan Williams dan.j.williams@intel.com
drivers/nvdimm/region.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-)
This looks good to me, Reviewed-by: Vishal Verma vishal.l.verma@intel.com
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c index ef46cc3a71ae..488c47ac4c4a 100644 --- a/drivers/nvdimm/region.c +++ b/drivers/nvdimm/region.c @@ -34,17 +34,6 @@ static int nd_region_probe(struct device *dev) if (rc) return rc;
- rc = nd_region_register_namespaces(nd_region, &err);
- if (rc < 0)
return rc;- ndrd = dev_get_drvdata(dev);
- ndrd->ns_active = rc;
- ndrd->ns_count = rc + err;
- if (rc && err && rc == err)
return -ENODEV;- if (is_nd_pmem(&nd_region->dev)) { struct resource ndr_res;
@@ -60,6 +49,17 @@ static int nd_region_probe(struct device *dev) nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res); }
- rc = nd_region_register_namespaces(nd_region, &err);
- if (rc < 0)
return rc;- ndrd = dev_get_drvdata(dev);
- ndrd->ns_active = rc;
- ndrd->ns_count = rc + err;
- if (rc && err && rc == err)
return -ENODEV;- nd_region->btt_seed = nd_btt_create(nd_region); nd_region->pfn_seed = nd_pfn_create(nd_region); nd_region->dax_seed = nd_dax_create(nd_region);