linux-kernel - Bug in SCSI async probing

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Message-ID: <Pine.LNX.4.44L0.0905261040230.5554-100000@iolanthe.rowland.org>
Date:	Tue, 26 May 2009 11:22:36 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Arjan van de Ven <arjan@...ux.intel.com>
cc:	SCSI development list <linux-scsi@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Bug in SCSI async probing

James & Arjan:

Am I missing something here?  It looks like

	fastboot: make scsi probes asynchronous

has introduced a bug in the sd probing code.  AFAICT, there is now
nothing to prevent do_scan_async() from returning before
sd_probe_async() has run.

Doesn't this mean that there's nothing to prevent sd_remove() from 
being called and trying to unregister the disk _before_ 
sd_probe_async() has managed to register it?

Alan Stern

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