linux-kernel - Re: [PATCH] scsi disk: Use its own buffer for the vpd request

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Message-ID: <87vc3nuipg.fsf@spindle.srvr.nix>
Date:	Sat, 03 Aug 2013 12:17:31 +0100
From:	Nick Alcock <nick.alcock@...eri.org.uk>
To:	Bernd Schubert <bernd.schubert@...tmail.fm>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, nick.cheng@...ca.com.tw,
	stable@...r.kernel.org, Douglas Gilbert <dgilbert@...erlog.com>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH] scsi disk: Use its own buffer for the vpd request

On 1 Aug 2013, Bernd Schubert stated:

> Once I noticed that scsi_get_vpd_page() works fine from other function
> calls and that it is not 0x89, but already 0x0 that fails fixing it became
> easy.
>
> Nix, any chance you could verify it also works for you?

Confirmed, thank you!

> Somehow older areca firmware versions have issues with
> scsi_get_vpd_page() and a large buffer.

I wonder if they're using math modulo SD_BUF_SIZE-1 by mistake, so they
misinterpret this as zero? (Still, doing math modulo 511 seems very
odd, even if this firmware *does* only support 512-byte sectors.)

-- 
NULL && (void)
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