From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 11898] mke2fs hang on AIC79 device.
Date: Mon,  3 Nov 2008 23:37:01 -0800 (PST)
Message-ID: <20081104073701.628FB108047@picon.linux-foundation.org>
References: <bug-11898-11613@http.bugzilla.kernel.org/>
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http://bugzilla.kernel.org/show_bug.cgi?id=11898





------- Comment #6 from yanmin_zhang@linux.intel.com  2008-11-03 23:37 -------
The hang palce is spin_lock_irq(q->queue_lock) in function scsi_request_fn:

 not_ready:
        spin_unlock_irq(shost->host_lock);

        /*
         * lock q, handle tag, requeue req, and decrement device_busy. We
         * must return with queue_lock held.
         *
         * Decrementing device_busy without checking it is OK, as all such
         * cases (host limits or settings) should run the queue at some
         * later time.
         */
======>        spin_lock_irq(q->queue_lock);
        blk_requeue_request(q, req);
        sdev->device_busy--;
        if(sdev->device_busy == 0)
                blk_plug_device(q);


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