From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: melinda develey <melinda.develey70@yahoo.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: spin_lock doesn't work?!?
Date: Thu, 30 Aug 2007 06:50:39 -0500 [thread overview]
Message-ID: <20070830065039.0f660dad@zod.rchland.ibm.com> (raw)
In-Reply-To: <762949.1267.qm@web63906.mail.re1.yahoo.com>
On Wed, 29 Aug 2007 23:30:22 -0700 (PDT)
melinda develey <melinda.develey70@yahoo.com> wrote:
> >You should still put the spin_lock calls into your code because >you
> >never know if someone else will compile it and for another >target. If
> >someone would, for example, compile the same code for a SMP >machine then
> >the spin_lock will actually lock.
>
> I used the spinlock both in an interrupt handler to protect a group of variables (because in an interrupt I can't use a semaphore) and the same spinlock in a ioctl handler where the same group of variables is accessed. Is this wrong? I have a 2.6.19.2 linux kernel.
You might want to use spin_lock_irq instead. That will disable
interrupts in the critical section in the ioctl. Seems more like what
you are trying to do.
josh
next prev parent reply other threads:[~2007-08-30 11:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-29 21:26 spin_lock doesn't work?!? melinda develey
2007-08-29 21:38 ` Scott Wood
2007-08-29 21:40 ` Wolfgang Reissnegger
2007-08-30 6:30 ` melinda develey
2007-08-30 11:50 ` Josh Boyer [this message]
2007-08-30 15:36 ` Wolfgang Reissnegger
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