linux-kernel - Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

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Date:   Mon, 25 Nov 2019 11:11:00 +0100
From:   Andrea Vai <andrea.vai@...pv.it>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Damien Le Moal <Damien.LeMoal@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        USB list <linux-usb@...r.kernel.org>,
        SCSI development list <linux-scsi@...r.kernel.org>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        Hannes Reinecke <hare@...e.com>,
        Omar Sandoval <osandov@...com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Hans Holmberg <Hans.Holmberg@....com>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Slow I/O on USB media after commit
 f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

Il giorno lun, 25/11/2019 alle 11.54 +0800, Ming Lei ha scritto:
> On Sat, Nov 23, 2019 at 04:44:55PM +0100, Andrea Vai wrote:
> > Il giorno sab, 23/11/2019 alle 15.28 +0800, Ming Lei ha scritto:
> > > 
> > > Please post the log of 'lsusb -v', and I will try to make a
> patch
> > > for
> > > addressing the issue.
> > 
> > attached,
> 
> Please apply the attached patch, and re-build & install & reboot
> kernel.
> 
> This time, please don't switch io scheduler.

# patch -p1 < usb.patch outputs:

(Stripping trailing CRs from patch; use --binary to disable.)
patching file block/blk-mq.c
Hunk #1 succeeded at 1465 (offset 29 lines).
Hunk #2 succeeded at 3061 (offset 13 lines).
(Stripping trailing CRs from patch; use --binary to disable.)
patching file drivers/scsi/scsi_lib.c
Hunk #1 succeeded at 1902 (offset -37 lines).
(Stripping trailing CRs from patch; use --binary to disable.)
patching file drivers/usb/storage/scsiglue.c
Hunk #1 succeeded at 651 (offset -10 lines).
(Stripping trailing CRs from patch; use --binary to disable.)
patching file include/linux/blk-mq.h
Hunk #1 succeeded at 226 (offset -162 lines).
(Stripping trailing CRs from patch; use --binary to disable.)
patching file include/scsi/scsi_host.h
patch unexpectedly ends in middle of line
patch unexpectedly ends in middle of line

Just to be sure I have to go on, is this correct? Sounds like an error
but I don't know if it is important.

Thanks,
Andrea