linux-kernel - Re: [PATCH 3/6] IDE: ide-cd: fix test unsigned var

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Date:	Sun, 27 Apr 2008 20:32:51 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	petkovbb@...il.com
Cc:	"Roel Kluin" <12o3l@...cali.nl>, linux-ide@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] IDE: ide-cd: fix test unsigned var < 0

On Thursday 17 April 2008, Boris Petkov wrote:
> On Thu, Apr 17, 2008 at 1:04 PM, Roel Kluin <12o3l@...cali.nl> wrote:
> > Boris Petkov wrote:
> >
> >  > I'd rather keep the "unsigned long bio_sectors;" part and do something
> >  > of the likes of:
> >  >
> >  > bio_sectors = bio_sectors(failed_command->bio);
> >  >
> >  >
> >  > (remove the "if (bio_sectors < 4)"-test)
> >  >
> >  > ... and later...
> >  >
> >  > sector &= ~(max(bio_sectors - 1, 3));

drivers/ide/ide-cd.c: In function ‘cdrom_analyze_sense_data’:
drivers/ide/ide-cd.c:180: warning: comparison of distinct pointer types lacks a cast

[ which actually hints us into real issue -> please think what would
  happen if bio_sectors() returns _zero_ before and after the patch ]

I applied the patch replacing the above code with:

	bio_sectors = max(bio_sectors(failed_command->bio), 4U);
	sector &= ~(bio_sectors - 1);

Thanks,
Bart
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