linux-kernel - Re: [PATCH 0/3] ide: Fix use of paired device

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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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