On Thu, 17 Oct 2019, Piergiorgio Sartor wrote:

quoted

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