linux-kernel - Re: [PATCH RESEND 0/3] scsi: fix internal write cache issue on usb hdd.

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Message-ID: <20120716234805.GA9875@kroah.com>
Date:	Mon, 16 Jul 2012 16:48:05 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	James.Bottomley@...senPartnership.com,
	mdharm-usb@...-eyed-alien.net, stern@...land.harvard.edu,
	sshtylyov@...sta.com, bvanassche@....org,
	akpm@...ux-foundation.org, linux-usb@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH RESEND 0/3] scsi: fix internal write cache issue on usb
 hdd.

On Sat, Jul 07, 2012 at 11:04:45PM -0400, Namjae Jeon wrote:
> From: Namjae Jeon <namjae.jeon@...sung.com>
> 
> The numbers of USB HDDs(All USB HDD I checked) does not respond
> correctly to scsi mode sense command for retrieving the write cache
> page status. Even though write cache is enabled by default, due to
> scsi driver assume that cache is not enabled which in turn might lead
> to loss of data since data still will be in cache.
> This result that all filesystems is not stable on USB HDD when the
> device is unplugged abruptly, even though these are having journaling
> feature. Our first trying is that scsi driver send ATA command
> (ATA Pass through, #85) to USB HDD after failure from normal routine to
> know write cache enable.
> We have known it is dangerous after testing several USB HDD. some of
> HDD is stalled by this command(A-DATA HDD). So we tried to make the
> patch James Bottomley's suggestion(usb quirk) on version 2 that add
> product ID and verdor ID of USB HDD to USB quirk list after checking
> write cache.
> All filesystem will be stable on USB HDD registered in quirk list.
> And it will be updated continuously.

Now applied to the usb-next branch.

thanks,

greg k-h
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