On Thu, 17 Oct 2019, Piergiorgio Sartor wrote:
> > Here is one more thing you can try. I have no idea whether it will
> > make any difference, but the Changelog entry for the patch you
> > identified suggests that it might help.
> >
> > Alan Stern
> >
> >
> >
> > Index: usb-devel/drivers/usb/storage/scsiglue.c
> > ===================================================================
> > --- usb-devel.orig/drivers/usb/storage/scsiglue.c
> > +++ usb-devel/drivers/usb/storage/scsiglue.c
> > @@ -68,7 +68,6 @@ static const char* host_info(struct Scsi
> > static int slave_alloc (struct scsi_device *sdev)
> > {
> > struct us_data *us = host_to_us(sdev->host);
> > - int maxp;
> >
> > /*
> > * Set the INQUIRY transfer length to 36. We don't use any of
> > @@ -78,15 +77,6 @@ static int slave_alloc (struct scsi_devi
> > sdev->inquiry_len = 36;
> >
> > /*
> > - * USB has unusual scatter-gather requirements: the length of each
> > - * scatterlist element except the last must be divisible by the
> > - * Bulk maxpacket value. Fortunately this value is always a
> > - * power of 2. Inform the block layer about this requirement.
> > - */
> > - maxp = usb_maxpacket(us->pusb_dev, us->recv_bulk_pipe, 0);
> > - blk_queue_virt_boundary(sdev->request_queue, maxp - 1);
> > -
> > - /*
> > * Some host controllers may have alignment requirements.
> > * We'll play it safe by requiring 512-byte alignment always.
> > */
>
> Hi,
>
> I tested the patch.
>
> Assumming I did everything properly, add patch,
> test, issue not showing up, remove patch, re-test,
> issue present.
>
> It seems this patch you provide solves the issue.
>
> Thanks a lot for the support and the solution.
>
> I guess now this patch will be integrated into
> mainline sometimes.
> Please let me know, in this thread or directly, in
> which kernel it will be available.
I'm busy for the next few days, but I will submit the patch next week.
> Thanks again, it would be for me impossible to
> solve without your support,
You're welcome.
Alan Stern
