4.18-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Duyck alexander.h.duyck@linux.intel.com
commit b6eae0f61db27748606cc00dafcfd1e2c032f0a5 upstream.
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: 4d88a97aa9e8 ("libnvdimm: ...base ... infrastructure") Signed-off-by: Alexander Duyck alexander.h.duyck@linux.intel.com Signed-off-by: Dan Williams dan.j.williams@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/nvdimm/bus.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -488,6 +488,8 @@ static void nd_async_device_register(voi 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 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);