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From: Alexander Duyck <alexander.h.duyck@linux.intel.com>
To: linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org
Cc: zwisler@kernel.org
Subject: [PATCH 1/2] nvdimm: Hold reference on parent while scheduling async init
Date: Tue, 25 Sep 2018 13:53:02 -0700	[thread overview]
Message-ID: <20180925205301.6182.58728.stgit@localhost.localdomain> (raw)
In-Reply-To: <20180925204801.6182.73167.stgit@localhost.localdomain>

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.

Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
---
 drivers/nvdimm/bus.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 8aae6dcc839f..9148015ed803 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -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);

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  reply	other threads:[~2018-09-25 20:53 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-25 20:52 [PATCH 0/2] Minor fixups for nd_device_register Alexander Duyck
2018-09-25 20:53 ` Alexander Duyck [this message]
2018-09-25 21:09   ` [PATCH 1/2] nvdimm: Hold reference on parent while scheduling async init Dan Williams
2018-09-25 20:53 ` [PATCH 2/2] nvdimm: Set device node in nd_device_register Alexander Duyck
2018-09-25 21:08   ` Dan Williams
2018-09-25 21:11     ` Alexander Duyck
2018-09-25 21:32       ` Dan Williams
2018-09-25 21:35         ` Alexander Duyck
2018-09-25 21:50           ` Williams, Dan J

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