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libnvdimm: btt_devs: Fix locking in namespace_store

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Always take device_lock() before nvdimm_bus_lock() to prevent deadlock.

Cc: <stable@vger.kernel.org>
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Axel Lin 2015-09-16 21:24:47 +08:00 committed by Dan Williams
parent f0b2e563bc
commit 4be9c1fc3d
1 changed files with 2 additions and 2 deletions
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4
drivers/nvdimm/btt_devs.c
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@ -128,13 +128,13 @@ static ssize_t namespace_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
nvdimm_bus_lock(dev);
device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_btt->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;
}