libnvdimm: btt_devs: Fix locking in namespace_store
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>
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@ -128,13 +128,13 @@ static ssize_t namespace_store(struct device *dev,
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struct nd_btt *nd_btt = to_nd_btt(dev);
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struct nd_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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ssize_t rc;
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nvdimm_bus_lock(dev);
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device_lock(dev);
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device_lock(dev);
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nvdimm_bus_lock(dev);
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rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
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rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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device_unlock(dev);
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nvdimm_bus_unlock(dev);
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nvdimm_bus_unlock(dev);
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device_unlock(dev);
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return rc;
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return rc;
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}
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}
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