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Message-ID: <a84bb079-0de8-b79b-ae33-afe81f325e32@nextfour.com>
Date: Fri, 28 Apr 2017 07:37:54 +0300
From: Mika Penttilä <mika.penttila@...tfour.com>
To: LKML <linux-kernel@...r.kernel.org>,
Dan Williams <dan.j.williams@...el.com>
Subject: nvdimm/pmem device lifetime
Hi,
Just wondering the pmem struct device vs gendisk lifetimes.. from pmem_attach_disk():
device_add_disk(dev, disk);
devm_add_action_or_reset(dev, pmem_release_disk, disk);
where:
static void pmem_release_disk(void *disk)
{
del_gendisk(disk);
put_disk(disk);
}
but device_add_disk() makes disk pin dev (as a parent), and it's unpinned by del_gendisk()
which is called when dev is released, but it's not because of this circular dependency?
--Mika
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