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From:   Peter Chen <peter.chen@nxp.com>
To:     Alan Stern <stern@rowland.harvard.edu>
CC:     Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>,
        Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        USB list <linux-usb@vger.kernel.org>,
        "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
        Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: reeze while write on external usb 3.0 hard disk [Bug 204095]
Thread-Topic: reeze while write on external usb 3.0 hard disk [Bug 204095]
Thread-Index: AQHVVOKTn0FJLyYmMEO6xr/XJ+YAlKcChwmAgAEfggCAAJrEAIAJfxWAgC8dUYCAABeMAIAChrqA
Date:   Fri, 27 Sep 2019 09:04:19 +0000
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On 19-09-25 14:31:58, Alan Stern wrote:
> On Wed, 25 Sep 2019, Piergiorgio Sartor wrote:
>=20
> > On Mon, Aug 26, 2019 at 07:38:33PM +0200, Piergiorgio Sartor wrote:
> > > On Tue, Aug 20, 2019 at 06:37:22PM +0200, Piergiorgio Sartor wrote:
> > > > On Tue, Aug 20, 2019 at 09:23:26AM +0200, Christoph Hellwig wrote:
> > > > > On Mon, Aug 19, 2019 at 10:14:25AM -0400, Alan Stern wrote:
> > > > > > Let's bring this to the attention of some more people.
> > > > > >=20
> > > > > > It looks like the bug that was supposed to be fixed by commit
> > > > > > d74ffae8b8dd ("usb-storage: Add a limitation for
> > > > > > blk_queue_max_hw_sectors()"), which is part of 5.2.5, but appar=
ently
> > > > > > the bug still occurs.
> > > > >=20
> > > > > Piergiorgio,
> > > > >=20
> > > > > can you dump the content of max_hw_sectors_kb file for your USB s=
torage
> > > > > device and send that to this thread?
> > > >=20
> > > > Hi all,
> > > >=20
> > > > for both kernels, 5.1.20 (working) and 5.2.8 (not working),
> > > > the content of /sys/dev/x:y/queue/max_hw_sectors_kb is 512
> > > > for USB storage devices (2.0 and 3.0).
> > > >=20
> > > > This is for the PC showing the issue.
> > > >=20
> > > > In an other PC, which does not show the issus at the moment,
> > > > the values are 120, for USB2.0, and 256, for USB3.0.
> > >=20
> > > Hi again,
> > >=20
> > > any news on this?
> > >=20
> > > Is there anything I can do to help?
> > >=20
> > > Should I report this somewhere else too?
> > >=20
> > > Currently this is quite a huge problem for me,
> > > since the only working external storage is an
> > > old 1394 HDD...
> >=20
> > Hi all,
> >=20
> > I'm now on kernel 5.2.16, from Fedora, and still I
> > see the same issue.
> >=20
> > I guess it is not a chipset quirk, since there
> > are two involved here.
> > For the USB 2.0 I've (with "lspci"):
> >=20
> > USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x=
0 USB EHCI Controller (prog-if 20 [EHCI])
> >=20
> > For USB 3.0 I've:
> >=20
> > USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Con=
troller (prog-if 30 [XHCI])
> >=20
> > Any idea on how to proceed?
> >=20
> > Thanks a lot.
>=20
> One thing you can try is git bisect from 5.1.20 (or maybe just 5.1.0) =20
> to 5.2.8.  If you can identify a particular commit which caused the
> problem to start, that would help.
>=20
> Alan Stern

Hi Piergiorgio,

Would you please check if below patch helps?

commit 449fa54d6815be8c2c1f68fa9dbbae9384a7c03e
Author: Fugang Duan <fugang.duan@nxp.com>
Date:   Fri Jul 19 17:26:48 2019 +0800

    dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/dev=
ice
       =20

--=20

Thanks,
Peter Chen=