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

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Date:   Fri, 15 Mar 2019 02:28:13 +0000
From:   <Kento.A.Kobayashi@...y.com>
To:     <oneukum@...e.com>, <gregkh@...uxfoundation.org>,
        <stern@...land.harvard.edu>
CC:     <usb-storage@...ts.one-eyed-alien.net>, <Jacky.Cao@...y.com>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linux-usb@...r.kernel.org>
Subject: RE: [PATCH] usb: uas: fix usb subsystem hang after power off hub
 port

Hi,

>> And the return value(-ENODEV) will be returned to error handler.
>> uas_eh_device_reset_handler->usb_reset_device -> usb_reset_and_verify_device (return -ENODEV) Then I wrote that commit message that we think even if we ignore "ENODEV" in post reset to avoid hang issue but the error will also be reported to error handler.
>> #If ignore an error and the error will not be reported then it is not good.
>
>Well, what do we do now? Are you saying that the state model SCSI is using is wrong?

No, it is not wrong.
But I think we may want to prevend hang by sleep peocess with continuing to take a lock at blk_execute_rq() from usb_unbind_and_rebind_marded_interfaces().

Regards,
Kento Kobayashi