linux-kernel - Re: [PATCH] arch/tile: add arch/tile/drivers/ directory with SROM driver

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Message-Id: <201105202046.40696.arnd@arndb.de>
Date:	Fri, 20 May 2011 20:46:40 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>,
	Chris Wright <chrisw@...s-sol.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Benjamin Thery <benjamin.thery@...l.net>,
	Phil Carmody <ext-phil.2.carmody@...ia.com>
Subject: Re: [PATCH] arch/tile: add arch/tile/drivers/ directory with SROM driver

On Friday 20 May 2011 20:05:05 Chris Metcalf wrote:
> This works well, except for the fact that we take advantage of the fact
> that the hypervisor driver internally buffers up writes to the current
> EEPROM sector, and flushes it to hardware only when explicitly told to do
> so, or when we start writing to another sector.  This avoids excessive wear
> on the EEPROM and also handles detection of whether we need to do a sector
> erase before the re-write.  However, it also means that we need to be able
> to issue the final explicit flush, or else the last write just sits in the
> hypervisor buffer indefinitely.  To make that happen I think I need to
> extend the bin_attribute structure, and the bin.c release() function, slightly:

Yes, that would work. Another option would be to add a flush() callback
to the bin_attribute. Since filp_close calls both fops->flush and
fops->release, that would also make it possible to flush the buffer
without closing it, if necessary.

	Arnd
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