From: "Uwe Kleine-König" <Uwe.Kleine-Koenig@digi.com>
To: Magnus Damm <magnus.damm@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"gregkh@suse.de" <gregkh@suse.de>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"hjk@linutronix.de" <hjk@linutronix.de>,
"lethal@linux-sh.org" <lethal@linux-sh.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"alan@lxorguk.ukuu.org.uk" <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] uio: uio_pdrv_genirq V3
Date: Fri, 11 Jul 2008 12:18:39 +0200 [thread overview]
Message-ID: <20080711101839.GA26106@digi.com> (raw)
In-Reply-To: <20080711095527.6762.84233.sendpatchset@rx1.opensource.se>
Magnus Damm wrote:
> - kept irq control spinlock to serialize user space access
I think you want to assert, that after a succeeded
echo 0 > /dev/uioX
the userspace doesn't need to check for a pending irq?! What happens if
the irq triggers before you take the lock?
Best regards
Uwe
--
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
next prev parent reply other threads:[~2008-07-11 10:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-11 9:55 [PATCH] uio: uio_pdrv_genirq V3 Magnus Damm
2008-07-11 10:18 ` Uwe Kleine-König [this message]
2008-07-11 10:26 ` Magnus Damm
2008-07-13 22:47 ` Hans J. Koch
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