From: Russell King <rmk+lkml@arm.linux.org.uk>
To: "Michael K. Edwards" <medwards.linux@gmail.com>
Cc: Jose Goncalves <jose.goncalves@inov.pt>,
Frederik Deweerdt <deweerdt@free.fr>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: Serial related oops
Date: Mon, 19 Feb 2007 20:51:53 +0000 [thread overview]
Message-ID: <20070219205153.GH27370@flint.arm.linux.org.uk> (raw)
In-Reply-To: <f2b55d220702191237o2e6c4211u58a77deae1febe70@mail.gmail.com>
On Mon, Feb 19, 2007 at 12:37:00PM -0800, Michael K. Edwards wrote:
> What we've seen on our embedded ARM is that enabling an interrupt that
> is shared between multiple UARTs, at a stage when you have not set up
> all the data structures touched by the ISR and softirq, can have
> horrible consequences, including soft lockups and fandangos on core.
Incorrect. We have:
1. registered an interrupt handler at this point.
2. disabled interrupts (we're under the spin lock)
So, no interrupt will be seen by the CPU since the interrupt is masked.
The test is intentionally designed to be safe from the interrupt
generation point of view.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next prev parent reply other threads:[~2007-02-19 20:52 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-20 13:29 Serial related oops Frederik Deweerdt
2007-02-19 13:45 ` Russell King
2007-02-20 14:24 ` Frederik Deweerdt
2007-02-19 14:35 ` Russell King
2007-02-20 14:48 ` Frederik Deweerdt
2007-02-19 15:05 ` Russell King
2007-02-19 16:29 ` Jose Goncalves
2007-02-19 16:42 ` Russell King
2007-02-19 17:54 ` Jose Goncalves
2007-02-19 20:37 ` Michael K. Edwards
2007-02-19 20:51 ` Russell King [this message]
2007-02-19 21:24 ` Michael K. Edwards
2007-02-19 21:31 ` Russell King
2007-02-19 22:16 ` Michael K. Edwards
2007-02-19 23:20 ` Russell King
2007-02-20 0:04 ` Michael K. Edwards
2007-02-20 0:21 ` Russell King
2007-02-20 2:17 ` Michael K. Edwards
2007-02-24 2:46 ` Michael K. Edwards
2007-02-19 21:23 ` Russell King
2007-02-21 14:13 ` Jose Goncalves
2007-02-21 14:55 ` Jose Goncalves
2007-02-21 22:53 ` Frederik Deweerdt
2007-02-21 23:05 ` Russell King
2007-02-22 0:34 ` Michael K. Edwards
2007-02-22 8:54 ` Russell King
2007-02-22 15:07 ` Jose Goncalves
2007-02-22 16:56 ` Russell King
2007-02-22 17:24 ` jose.goncalves
2007-02-22 5:57 ` H. Peter Anvin
2007-02-22 7:39 ` Frederik Deweerdt
2007-02-22 8:52 ` Russell King
2007-02-22 15:02 ` Jose Goncalves
2007-02-22 17:03 ` Russell King
2007-02-22 17:21 ` jose.goncalves
2007-02-22 17:32 ` Paul Fulghum
2007-03-01 13:33 ` Jose Goncalves
2007-03-01 15:10 ` Russell King
2007-03-01 15:24 ` Jose Goncalves
[not found] <fa.0IigYYV566ZB0kBHCj88jOEJx1s@ifi.uio.no>
[not found] ` <fa.IE91N03KQO01UZbOdcF6HewOdYc@ifi.uio.no>
2007-02-20 2:48 ` Robert Hancock
2007-02-20 4:59 ` Michael K. Edwards
2007-02-20 5:18 ` Robert Hancock
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