linux-kernel - Re: Linux 3.3-rc5

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Date:	Tue, 28 Feb 2012 20:29:00 +0100
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mark Lord <kernel@...savvy.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.3-rc5

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> I also think that your explanation is wrong. The problem is not the
> use of _IOR() at all, the problem is that the data structure given
> *to* the _IOR() macro is complete grabage. For example:
>
>   #define I8K_GET_SPEED           _IOWR('i', 0x85, size_t)

Originally the garbage looked like this:

#define I8K_BIOS_VERSION       _IOR ('i', 0x80, 4)
#define I8K_MACHINE_ID         _IOR ('i', 0x81, 16)
#define I8K_POWER_STATUS       _IOR ('i', 0x82, sizeof(int))
#define I8K_FN_STATUS          _IOR ('i', 0x83, sizeof(int))
#define I8K_GET_TEMP           _IOR ('i', 0x84, sizeof(int))
#define I8K_GET_SPEED          _IOWR('i', 0x85, sizeof(int))
#define I8K_GET_FAN            _IOWR('i', 0x86, sizeof(int))
#define I8K_SET_FAN            _IOWR('i', 0x87, sizeof(int)*2)

Later they were modified by "[PATCH] use size_t for the broken ioctl
numbers" and "Fix more ioctl _IOR/_IOW misusage." (see tglx's history
tree).

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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