On Mon, Oct 21, 2019 at 11:48:06AM -0400, Alan Stern wrote:
> There is no longer any reason to keep the virt_boundary_mask setting
> for usb-storage.  It was needed in the first place only for handling
> devices with a block size smaller than the maxpacket size and where
> the host controller was not capable of fully general scatter-gather
> operation (that is, able to merge two SG segments into a single USB
> packet).  But:
>       High-speed or slower connections never use a bulk maxpacket
>       value larger than 512;
>       The SCSI layer does not handle block devices with a block size
>       smaller than 512 bytes;
>       All the host controllers capable of SuperSpeed operation can
>       handle fully general SG;
>       Since commit ea44d190764b ("usbip: Implement SG support to
>       vhci-hcd and stub driver") was merged, the USB/IP driver can
>       also handle SG.
> Therefore all supported device/controller combinations should be okay
> with no need for any special virt_boundary_mask.  So in order to fix
> the swiotlb problem, this patch reverts commit 747668dbc061.

That's great to know.  The same should also apply to uas, shouldn't


Acked-by: Christoph Hellwig <h...@lst.de>

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