linux-kernel - Re: [PATCH 06/21] ide-floppy: remove struct idefloppy_flexible_disk

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Date:	Sat, 12 Jan 2008 21:15:29 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Borislav Petkov <bbpetkov@...oo.de>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 06/21] ide-floppy: remove struct idefloppy_flexible_disk_page

On Saturday 12 January 2008, Bartlomiej Zolnierkiewicz wrote:

[...]

> > -	header = (idefloppy_mode_parameter_header_t *) pc.buffer;
> > -	floppy->wp = header->wp;
> > +	floppy->wp = pc.buffer[3] & 0x80;
> 
> This is not an equivalent transformation:
> 
> header->wp is 0 or 1
> pc.buffer[3] & 0x80 is 0 or 0x80
> 
> It seems to work fine for ->wp (because it is needlessly defined as 'int')
> but may seriously confuse set_disk_ro() and thus bdev_read_only() users.
> 
> Should be fixed to '(pc.buffer[3] & 0x80) ? 1 : 0' (or something similar).

Update: this change belongs to patch #10 (+ the need for such change in
patch #6 is a hint that #10 should be before #6)
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