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Message-ID: <Pine.LNX.4.44L0.1408271051160.1460-100000@iolanthe.rowland.org>
Date: Wed, 27 Aug 2014 10:54:53 -0400 (EDT)
From: Alan Stern <stern@...land.harvard.edu>
To: Matthieu CASTET <matthieu.castet@...rot.com>
cc: linux-scsi@...r.kernel.org,
James Bottomley <James.Bottomley@...senPartnership.com>,
TARUISI Hiroaki <taruishi.hiroak@...fujitsu.com>,
<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: Buffer I/O error after s2ram with usb storage
On Wed, 27 Aug 2014, Matthieu CASTET wrote:
> Ping
>
> I have got also a problem with a usb sdcard reader (without power cut
> during suspend)
> > > The usb storage driver call scsi_report_bus_reset after device reset,
> > > but because of commit dfcf7775 <4>, we don't ignore unit attention if
> > > "sshdr.asc == 0x28 && sshdr.ascq == 0x00" ("Not-ready to ready").
> > >
> > > If dfcf7775 is reverted there is no more Buffer I/O error.
> > >
> > > Is that possible to find a way to restore the behavior before dfcf7775
> > > commit (no Buffer I/O error after device reset) after a suspend to ram ?
Since that commit was written to fix a problem with certain cdrom
drives, maybe we would work around the issue by modifying the commit.
Have it go back to the original behavior if the device isn't a cdrom
drive.
That's not a complete fix (it won't help when a CD drive is attached
via USB), but maybe it's better than nothing.
Alan Stern
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