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Date: Wed, 14 Dec 2016 23:17:46 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: linux-kernel@...r.kernel.org,
Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH] libnvdimm,
dax: replace mutex_is_locked() warnings with lockdep_assert_held
For warnings that should only ever trigger during development and
testing replace WARN statements with lockdep_assert_held. The lockdep
pattern is prevalent, and these paths are are well covered by libnvdimm
+ dax unit tests.
Reported-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/dax/dax.c | 4 ++--
drivers/nvdimm/claim.c | 10 ++++------
drivers/nvdimm/namespace_devs.c | 2 +-
drivers/nvdimm/region_devs.c | 2 +-
4 files changed, 8 insertions(+), 10 deletions(-)
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index c7b23d52f945..cae68465f430 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -94,7 +94,7 @@ static unsigned long long dax_region_avail_size(
unsigned long long size;
struct resource *res;
- WARN_ON_ONCE(!mutex_is_locked(&dax_region->lock));
+ lockdep_assert_held(&dax_region->lock);
size = resource_size(&dax_region->res);
for_each_dax_region_resource(dax_region, res) {
@@ -419,7 +419,7 @@ static unsigned long long dax_dev_size(struct dax_dev *dax_dev)
unsigned long long size = 0;
int i;
- WARN_ON_ONCE(!mutex_is_locked(&dax_region->lock));
+ lockdep_assert_held(&dax_region->lock);
if (!dax_dev->alive)
return 0;
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index d5dc80c48b4c..b910d171824a 100644
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -22,9 +22,8 @@ void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
{
struct nd_namespace_common *ndns = *_ndns;
- dev_WARN_ONCE(dev, !mutex_is_locked(&ndns->dev.mutex)
- || ndns->claim != dev,
- "%s: invalid claim\n", __func__);
+ lockdep_assert_held(&ndns->dev.mutex);
+ dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
ndns->claim = NULL;
*_ndns = NULL;
put_device(&ndns->dev);
@@ -49,9 +48,8 @@ bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
{
if (attach->claim)
return false;
- dev_WARN_ONCE(dev, !mutex_is_locked(&attach->dev.mutex)
- || *_ndns,
- "%s: invalid claim\n", __func__);
+ lockdep_assert_held(&attach->dev.mutex);
+ dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
attach->claim = dev;
*_ndns = attach;
get_device(&attach->dev);
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index abe5c6bc756c..874471a98751 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1653,7 +1653,7 @@ static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
u64 hw_start, hw_end, pmem_start, pmem_end;
struct nd_label_ent *label_ent;
- WARN_ON(!mutex_is_locked(&nd_mapping->lock));
+ lockdep_assert_held(&nd_mapping->lock);
list_for_each_entry(label_ent, &nd_mapping->labels, list) {
nd_label = label_ent->label;
if (!nd_label)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 6af5e629140c..7cd705f3247c 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -509,7 +509,7 @@ void nd_mapping_free_labels(struct nd_mapping *nd_mapping)
{
struct nd_label_ent *label_ent, *e;
- WARN_ON(!mutex_is_locked(&nd_mapping->lock));
+ lockdep_assert_held(&nd_mapping->lock);
list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
list_del(&label_ent->list);
kfree(label_ent);
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