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From:   bugzilla-daemon@bugzilla.kernel.org
To:     linux-scsi@vger.kernel.org
Subject: [Bug 207877] ASMedia drive (174c:55aa) hangs in ioctl
 CDROM_DRIVE_STATUS when mounting a DVD
Date:   Sun, 24 May 2020 23:48:07 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=207877

--- Comment #3 from Bart Van Assche (bvanassche@acm.org) ---
I think there are fewer processes involved in the v5.7-rc6 hang. Anyway, please
report this on the appropriate USB mailing list. It seems to me that the
following USB code is involved in the hang:

static int device_reset(struct scsi_cmnd *srb)
{
        struct us_data *us = host_to_us(srb->device->host);
        int result;

        usb_stor_dbg(us, "%s called\n", __func__);

        /* lock the device pointers and do the reset */
        mutex_lock(&(us->dev_mutex));
        result = us->transport_reset(us);
        mutex_unlock(&us->dev_mutex);

        return result < 0 ? FAILED : SUCCESS;
}

and also

static int usb_stor_control_thread(void * __us)
{
                [ ... ]
                mutex_lock(&(us->dev_mutex));
                [ ... ]
                        fill_inquiry_response(us, data_ptr, 36);
                [ ... ]
                mutex_unlock(&us->dev_mutex);
                [ ... ]
}

The following mailing list may be appropriate:

usb-storage@lists.one-eyed-alien.net

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