From: "Antonino A. Daplas" <adaplas@gmail.com>
To: linux-fbdev-devel@lists.sourceforge.net
Cc: linux-kernel@vger.kernel.org, Richard Purdie <rpurdie@rpsys.net>
Subject: Re: [Linux-fbdev-devel] Behaviour change of /dev/fb0?
Date: Sat, 15 Apr 2006 07:29:44 +0800 [thread overview]
Message-ID: <44403068.3020909@gmail.com> (raw)
In-Reply-To: <1145009768.6179.7.camel@localhost.localdomain>
Richard Purdie wrote:
> Ignoring whether this is a good idea or not, under 2.6.15 you could run
>
> dd if=/dev/zero of=/dev/fb0
>
> which would clear the framebuffer. It would end up saying "dd: /dev/fb0:
> No space left on device".
>
> Under 2.6.16 (and a recent git kernel), the same command clears the
> screen but then hangs. Was the change in behaviour intentional?
>
> I've noticed this on a couple of ARM based Zaurus handhelds under both
> w100fb and pxafb.
>
There is a change in behavior of fb_read and fb_write committed Jan 2006.
They return the number of bytes read or written if the requested size
is bigger than the remaining space. Previously, they returned -ENOSPC.
But I haven't experienced hangs...
Tony
next prev parent reply other threads:[~2006-04-14 23:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-14 10:16 Behaviour change of /dev/fb0? Richard Purdie
2006-04-14 23:29 ` Antonino A. Daplas [this message]
2006-04-15 0:13 ` [Linux-fbdev-devel] " Richard Purdie
2006-04-15 0:53 ` Antonino A. Daplas
2006-04-15 4:31 ` Andrew Morton
2006-04-15 5:38 ` [PATCH] fbdev: Fix return error of fb_write Antonino A. Daplas
2006-04-17 14:45 ` Richard Purdie
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