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authorAxel Lin <axel.lin@ingics.com>2015-09-16 16:25:38 +0300
committerDan Williams <dan.j.williams@intel.com>2015-09-17 18:47:50 +0300
commit4ca8b57a0af145f4e791f21dbca6ad789da9ee8b (patch)
tree22508d5613e87afd825dddfa0882214f20f879a4 /drivers/nvdimm/pfn_devs.c
parent4be9c1fc3df9c3b03c9bde8aec5e44fc73996a3f (diff)
downloadlinux-4ca8b57a0af145f4e791f21dbca6ad789da9ee8b.tar.xz
libnvdimm: pfn_devs: Fix locking in namespace_store
Always take device_lock() before nvdimm_bus_lock() to prevent deadlock. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/pfn_devs.c')
-rw-r--r--drivers/nvdimm/pfn_devs.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 3fd7d0d81a47..71805a1aa0f3 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -148,13 +148,13 @@ static ssize_t namespace_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
ssize_t rc;
- nvdimm_bus_lock(dev);
device_lock(dev);
+ nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
rc, buf, buf[len - 1] == '\n' ? "" : "\n");
- device_unlock(dev);
nvdimm_bus_unlock(dev);
+ device_unlock(dev);
return rc;
}