Re: [PATCH] add legacy I/O and memory access routines to /proc/bus/pci API

From: Andreas Dilger <>
Date: 2004-12-16 08:03:46
On Dec 15, 2004  09:27 -0800, Jesse Barnes wrote:
> +write
> +  Legacy I/O port space reads and writes must also be to a file
> +  position >64k--the kernel will route them to the target device.

Shouldn't that be < 64k based on the description of lseek?

> +lseek
> +  Can be used to set the current file position.  Note that the file
> +  size is limited to 64k as that's how big legacy I/O space is.

> +ioctl
> +  Note that not all architectures support the *_MMAP_* or *_RW_* ioctl
> +  commands.  If they're not supported, ioctl will return -EINVAL.

Shouldn't they return -ENOTTY?  That indicates to the caller that the
ioctl isn't handled, vs -EINVAL which indicates bad value being passed
(e.g. bad write size).

Cheers, Andreas
Andreas Dilger   

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Received on Wed Dec 15 16:04:23 2004

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