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From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "Russell King" <rmk@arm.linux.org.uk>,
       "Mike Anderson" <andmike@us.ibm.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.19 SCSI core bug?
Date: Thu, 12 Sep 2002 11:41:17 +0200
Message-Id: <20020912094117.10936@192.168.4.1>
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>1. we need to come up with a way of reasonably handing SCSI medium
>   errors if we are going to use the READ10 command with the FUA
>   bit clear.
>
>2. we could just set the FUA bit and bypass the drives on-board
>   cache completely.
>
>Note that the only reason I've found this is because my HBA drives
>are _really_ pedantic about checking that all expected data does
>in fact get transferred by the drive.
>
>I wonder how many other drives out there are buggy like this. 8/

What about setting FUA on the next command after an error ?

Would this work or may the disk really keep stale data around ?

I don't have a recent SCSI spec at hand, but is there a command
we can send after an error to force a cache flush & invalidate
or will it only flush dirty datas to platter and not invalidate ?

Ben.



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