path: root/drivers/nvdimm
diff options
authorDan Williams <dan.j.williams@intel.com>2018-09-27 15:01:55 -0700
committerDan Williams <dan.j.williams@intel.com>2018-09-28 11:12:34 -0700
commit5d394eee2c102453278d81d9a7cf94c80253486a (patch)
tree13aa5100525edf5f662942f4ecb34bcf4a8d93ef /drivers/nvdimm
parent48af2f7e52f4cd5eb41ebcd1bd2e326aa2d33d32 (diff)
libnvdimm, region: Fail badblocks listing for inactive regions
While experimenting with region driver loading the following backtrace was triggered: INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. [..] Call Trace: dump_stack+0x85/0xcb register_lock_class+0x571/0x580 ? __lock_acquire+0x2ba/0x1310 ? kernfs_seq_start+0x2a/0x80 __lock_acquire+0xd4/0x1310 ? dev_attr_show+0x1c/0x50 ? __lock_acquire+0x2ba/0x1310 ? kernfs_seq_start+0x2a/0x80 ? lock_acquire+0x9e/0x1a0 lock_acquire+0x9e/0x1a0 ? dev_attr_show+0x1c/0x50 badblocks_show+0x70/0x190 ? dev_attr_show+0x1c/0x50 dev_attr_show+0x1c/0x50 This results from a missing successful call to devm_init_badblocks() from nd_region_probe(). Block attempts to show badblocks while the region is not enabled. Fixes: 6a6bef90425e ("libnvdimm: add mechanism to publish badblocks...") Cc: <stable@vger.kernel.org> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index fa37afcd43ff..174a418cb171 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -560,10 +560,17 @@ static ssize_t region_badblocks_show(struct device *dev,
struct device_attribute *attr, char *buf)
struct nd_region *nd_region = to_nd_region(dev);
+ ssize_t rc;
- return badblocks_show(&nd_region->bb, buf, 0);
+ device_lock(dev);
+ if (dev->driver)
+ rc = badblocks_show(&nd_region->bb, buf, 0);
+ else
+ rc = -ENXIO;
+ device_unlock(dev);
+ return rc;
static DEVICE_ATTR(badblocks, 0444, region_badblocks_show, NULL);
static ssize_t resource_show(struct device *dev,

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