Re: [PATCH v2] usb-storage: Add a limitation for blk_queue_max_hw_sectors()

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On Tue, Jul 02, 2019 at 10:07:42AM +0000, Yoshihiro Shimoda wrote:
> Hi Alan, shuah, Suwan,
> 
> > From: Christoph Hellwig, Sent: Monday, June 17, 2019 3:22 PM
> > 
> > On Mon, Jun 17, 2019 at 04:17:43AM +0000, Yoshihiro Shimoda wrote:
> > > Thank you for the comments. So, should I wait for getting rid of the
> > > virt_boundary_mask stuff? If I revise the commit log of this patch,
> > > is it acceptable for v5.2-stable as a workaround? In other words,
> > > I worry about this issue exists on v5.2-stable.
> > 
> > It does exist on 5.2-stable and we should fix it.  I'll plan to resend
> > my series to fix the virt_boundary issues for the other SCSI driver
> > soon, but we'll still need to sort out usb-storage.
> 
> I guess that getting rid of the virt_boundary_mask stuff [1] needs more time.
> So, for v5.2-stable, would you accept my patch as a workaround?
> JFYI, v5.2-rc7 still has this "swiotlb buffer is full" issue.

Hi, Yoshihiro,

I have been implementing v2 of this patch according to Alan's comment
(allocate small buffers and urbs instead of one big buffer) and it
takes some time. The implementation is almost done but I think it
will take a few days or more because of the test and bug fix...

Regards

Suwan Kim



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