linux-kernel - Re: Re: BUG in kernel: Wrong Handling of USB HDD’s in scsiglue(slave_configure) and scsi/sd(sd_read_cache

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Message-ID: <1317670355.3041.53.camel@dabdike.int.hansenpartnership.com>
Date:	Mon, 03 Oct 2011 14:32:35 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Douglas Gilbert <dgilbert@...erlog.com>,
	Amit Sahrawat <amit.sahrawat83@...il.com>,
	linux-usb@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: Re: BUG in kernel: Wrong Handling of USB
 HDD’s in scsiglue(slave_configure) and
 scsi/sd(sd_read_cache_type)

On Mon, 2011-10-03 at 14:10 -0400, Alan Stern wrote:
> > No. You need to also take into account the RBC
> > device parameters mode page if present. See above.
> 
> All right, suppose neither page is present.  Does it then make sense to 
> assume by default that write caching is enabled?

You're the USB expert ... if we do that, we'll start sending
SYNCHRONIZE_CACHE commands down to a whole slew of devices we didn't
before ... is that going to cause problems with any USB SATLs?

James


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