From: Anton Vorontsov <avorontsov@ru.mvista.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-ide@vger.kernel.org,
Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
Sergei Shtylyov <sshtylyov@ru.mvista.com>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Daniel Walker <dwalker@mvista.com>
Subject: Re: [PATCH -rt] ide: fix interrupts processing issue with preempt-able hardirqs
Date: Wed, 25 Jun 2008 18:12:42 +0400 [thread overview]
Message-ID: <20080625141242.GA27389@polina.dev.rtsoft.ru> (raw)
In-Reply-To: <20080625133257.7677258d@lxorguk.ukuu.org.uk>
On Wed, Jun 25, 2008 at 01:32:57PM +0100, Alan Cox wrote:
> > The bug, as I see it, in the alim15x3 (ULi M5228) hardware: for some
> > reason it does not hold IRQ line, but rises it for some short period
> > of time (while the drive itself rises and holds it correctly -- I'm
> > seeing it via oscilloscope).
>
> Are you sure the kernel isn't touching the status register and so
> clearing the IRQ condition at the controller ?
There are lots of places that reads status register, and looking into
the code flow I don't see any problem with the code.
But to be sure I inserted a printk into INB, and I don't see any status
reads when/after the drive asserts its IRQ.
--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2
next prev parent reply other threads:[~2008-06-25 14:12 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-23 23:40 [PATCH -rt] ide: fix interrupts processing issue with preempt-able hardirqs Anton Vorontsov
2008-06-23 23:51 ` Ingo Molnar
2008-06-24 0:00 ` Anton Vorontsov
2008-06-25 12:34 ` Anton Vorontsov
2008-06-25 12:32 ` Alan Cox
2008-06-25 14:12 ` Anton Vorontsov [this message]
2008-06-25 13:15 ` Sergei Shtylyov
2008-06-25 14:22 ` Anton Vorontsov
2008-06-25 14:32 ` Alan Cox
2008-06-25 15:26 ` Anton Vorontsov
2008-06-25 14:59 ` Anton Vorontsov
2008-06-28 0:54 ` [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs Anton Vorontsov
2008-06-28 1:09 ` Anton Vorontsov
2008-06-28 9:15 ` Alan Cox
2008-06-28 9:14 ` Alan Cox
2008-06-28 10:43 ` Sergei Shtylyov
2008-06-29 12:49 ` Alan Cox
2008-06-29 13:17 ` Sergei Shtylyov
2008-06-29 14:23 ` Anton Vorontsov
2008-06-28 10:30 ` Sergei Shtylyov
2008-06-28 11:31 ` Anton Vorontsov
2008-06-28 11:52 ` Sergei Shtylyov
2008-06-29 23:26 ` Benjamin Herrenschmidt
2008-06-30 19:01 ` [RT] MPIC edge sensitive issues with hardirq preemption (was: Re: [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs) Anton Vorontsov
2008-06-30 21:59 ` Benjamin Herrenschmidt
2008-06-30 22:37 ` Anton Vorontsov
2008-07-01 10:41 ` [RT] MPIC edge sensitive issues with hardirq preemption Sergei Shtylyov
2008-07-01 11:34 ` Anton Vorontsov
2008-06-23 23:52 ` [PATCH -rt] ide: fix interrupts processing issue with preempt-able hardirqs Anton Vorontsov
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