linux-kernel - Re: [PATCH] usb: uas: fix usb subsystem hang after power off hub port

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Date:   Tue, 09 Apr 2019 22:11:06 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Kento.A.Kobayashi@...y.com,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Oliver Neukum <oneukum@...e.com>, gregkh@...uxfoundation.org,
        USB Storage list <usb-storage@...ts.one-eyed-alien.net>,
        Jacky.Cao@...y.com,
        Kernel development list <linux-kernel@...r.kernel.org>,
        SCSI development list <linux-scsi@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] usb: uas: fix usb subsystem hang after power off hub port


Bart,

> From which context does that unbind happen? From inside a SCSI EH
> callback or from the context of a workqueue? I think the former is not
> allowed but that the latter is allowed. The SRP initiator driver
> (ib_srp.c) follows the latter approach.

Yeah. It's better to punt the actual tear down.

-- 
Martin K. Petersen	Oracle Linux Engineering