RE: System reboot hangs due to race against devices_kset->listtriggered by SCSI FC workqueue

From: Alan Stern
Date: Fri Mar 05 2010 - 09:31:11 EST

On Thu, 4 Mar 2010, Hugh Daschbach wrote:

> I have added get_device()/put_device() to ensure there's the device
> hasn't fully disappeared before calling list_del_init(). Is this
> needed?

Yes, it is. In fact, it's necessary to insure the device doesn't
disappear before you call the shutdown routines!

> If so, there's "might_sleep()" commented out in put_device().
> Do I need to release the lock before calling put_device()?

A better approach might be to do the list_del_init() while still
holding the initial spinlock, before you call the shutdown methods.
Then do the put_device() before reacquiring the spinlock at the end of
the loop.

Alan Stern

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