From: Andreas Dilger <adilger@clusterfs.com>
To: Jesse Barnes <jbarnes@engr.sgi.com>
Cc: linux-pci@atrey.karlin.mff.cu, linux-ia64@vger.kernel.org,
linux-kernel@vger.kernel.org, benh@kernel.crashing.org,
bjorn.helgaas@hp.com
Subject: Re: [PATCH] add legacy I/O and memory access routines to /proc/bus/pci API
Date: Wed, 15 Dec 2004 21:03:46 +0000 [thread overview]
Message-ID: <20041215210346.GK9923@schnapps.adilger.int> (raw)
In-Reply-To: <200412150927.51733.jbarnes@engr.sgi.com>
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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
http://sourceforge.net/projects/ext2resize/
http://members.shaw.ca/adilger/ http://members.shaw.ca/golinux/
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next prev parent reply other threads:[~2004-12-15 21:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-14 17:41 [PATCH] add legacy I/O and memory access routines to /proc/bus/pci API Jesse Barnes
2004-12-14 23:55 ` Bjorn Helgaas
2004-12-15 0:11 ` Jesse Barnes
2004-12-15 3:06 ` Jesse Barnes
2004-12-15 8:57 ` [PATCH] add legacy I/O and memory access routines to Benjamin Herrenschmidt
2004-12-15 17:00 ` [PATCH] add legacy I/O and memory access routines to /proc/bus/pci API Jesse Barnes
2004-12-16 14:55 ` [PATCH] add legacy I/O and memory access routines to Benjamin Herrenschmidt
2004-12-16 16:26 ` [PATCH] add legacy I/O and memory access routines to /proc/bus/pci API Jesse Barnes
2004-12-15 17:27 ` Jesse Barnes
2004-12-15 21:03 ` Andreas Dilger [this message]
2004-12-15 23:15 ` Jesse Barnes
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