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Message-ID: <47174993.4010108@ru.mvista.com>
Date: Thu, 18 Oct 2007 15:54:59 +0400
From: Sergei Shtylyov <sshtylyov@...mvista.com>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
Linux IDE <linux-ide@...r.kernel.org>,
linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH 0/3] ide: Fix use of paired device
Hello.
Benjamin Herrenschmidt wrote:
> At least 2 drivers (siimage and cs5535) have a bug where they use
> the construct:
> ide_drive_t *pair = &hwif->drives[drive->dn ^ 1];
> To access the other drive in a master/slave pair. This is bogus
> because drive->dn is not the unit number, but the global drive
> number, thus can be 2 & 3 for ide1, 4 & 5 for ide2 etc...
Huh? With drive->dn calculated as:
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
drive->dn = (hwif->channel ? 2 : 0) + unit;
(with MAX_DRIVES always being 2) how comes it may be 4 or 5?!
> Please apply to 2.6.24 if no objection.
I object. :-)
MBR, Sergei
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