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libnvdimm: Hold reference on parent while scheduling async init 

Unlike asynchronous initialization in the core we have not yet associated
the device with the parent, and as such the device doesn't hold a reference
to the parent.

In order to resolve that we should be holding a reference on the parent
until the asynchronous initialization has completed.

Cc: <stable@vger.kernel.org>
Fixes: 4d88a97aa9 ("libnvdimm: ...base ... infrastructure")
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Alexander Duyck 2018-09-25 13:53:02 -07:00 committed by Dan Williams
parent 3c5c98d135
commit b6eae0f61d
1 changed files with 4 additions and 0 deletions
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4
drivers/nvdimm/bus.c
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@ -488,6 +488,8 @@ static void nd_async_device_register(void *d, async_cookie_t cookie)
put_device(dev);
}
put_device(dev);
if (dev->parent)
put_device(dev->parent);
}
static void nd_async_device_unregister(void *d, async_cookie_t cookie)
@ -507,6 +509,8 @@ void __nd_device_register(struct device *dev)
if (!dev)
return;
dev->bus = &nvdimm_bus_type;
if (dev->parent)
get_device(dev->parent);
get_device(dev);
async_schedule_domain(nd_async_device_register, dev,
&nd_async_domain);