From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Jason Wessel <jason.wessel@windriver.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
David Airlie <airlied@linux.ie>,
David Miller <davem@davemloft.net>,
Fenghua Yu <fenghua.yu@intel.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Russell King <linux@arm.linux.org.uk>,
Tony Luck <tony.luck@intel.com>
Subject: Re: [PATCH 1/3] Input: sysrq - drop tty argument from sysrq ops handlers
Date: Thu, 05 Aug 2010 12:03:05 +1000 [thread overview]
Message-ID: <1280973785.1902.167.camel@pasglop> (raw)
In-Reply-To: <4C59570F.7040201@windriver.com>
On Wed, 2010-08-04 at 07:03 -0500, Jason Wessel wrote:
> The usb serial has the same kind of problem with all sorts of locks.
> I
> had resorted to using a tasklet or workqueue to get the sysrq to
> execute
> just outside the usb serial driver context. This work never made it
> upstream because it was part of another series, but the reference is:
> http://lkml.org/lkml/2010/3/9/17
>
> For the standard serial you might be able to get away with dropping
> the
> lock for the sysrq.
>
> Did you have a particular way to trigger the problem or was it just
> completely random, because I don't know that I have observed this
> behavior with the typical 8250 driver.
Yes, I do actually :-) A 64-way machine and a bunch of processes
flooding the console will do it just fine :-)
Cheers,
Ben.
next prev parent reply other threads:[~2010-08-05 2:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 7:58 [PATCH 0/3] SysRq: do not pass tty argument around Dmitry Torokhov
2010-08-04 7:59 ` [PATCH 1/3] Input: sysrq - drop tty argument from sysrq ops handlers Dmitry Torokhov
2010-08-04 8:33 ` Benjamin Herrenschmidt
2010-08-04 9:09 ` Alan Cox
2010-08-05 1:59 ` Benjamin Herrenschmidt
2010-08-04 12:03 ` Jason Wessel
2010-08-05 2:03 ` Benjamin Herrenschmidt [this message]
2010-08-04 7:59 ` [PATCH 2/3] Input: sysrq - drop tty argument form handle_sysrq() Dmitry Torokhov
2010-08-04 11:25 ` Jason Wessel
2010-08-04 7:59 ` [PATCH 3/3] USB: drop tty argument from usb_serial_handle_sysrq_char() Dmitry Torokhov
2010-08-04 11:25 ` Jason Wessel
2010-08-04 9:11 ` [PATCH 0/3] SysRq: do not pass tty argument around Alan Cox
2010-08-04 19:44 ` Greg KH
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