Recently, checked the spdk_io_device_unregister function,
it will have deferred free behaviour, and the io_device
will possibly be freed in put_io_channel function.
And this means that it is not safe to directly call:
spdk_io_device_unregister (io_device, NULL);
Then free io_device relately resource.
Because there will be channel to use the resources associated
with io_device. Then we will possibly cause a NULL pointer access.
I found this issue in bdev rbd module, and I think that the
same issue could happen in other modules. So it is better to put the
resource free function as the call back function.
Change-Id: Icc1f86d72b672faefb3b7f416030b818a8cf45ce
Signed-off-by: Ziye Yang <ziye.yang@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7646
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Community-CI: Broadcom CI
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
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