Problem with spinlocks in SMP kernel

Problem with spinlocks in SMP kernel

[Srinivas G.]

Hi, 
 
We developed a driver for PCI card. It was compiled and working fine under non-smp kernel. But when we port it into SMP kernel it is not working. System is going to hang permanently. What problem peter got at the following site, the same problem we got here. When we don't use spinlocks it is working fine under SMP kernel also. But when we use spinlocks it is not working under SMP kernel. The link peter posted the error I am sending here. 
 
http://www.linuxtv.org/mailinglists/linux-dvb/2002/06-2002/msg00178.html
 
I tried with spin_lock_irqsave(&xxx,flags) and spin_unlock_irqrestore(&xxx,flags). Then also system halts.
 
Why system is permanently hanging? What was the problem? Is their any OS problem?
 
We are using following configuration:
 
P4 HT Processor, RealTech 8139 Network card, Redhat 9.0 Kernel version 2.4.20-8smp.
 
Thanks in advance for any help you can come up with.
 
Regards,
 
Srinivas G
 

Re: Problem with spinlocks in SMP kernel

[Dave Jones]

On Mon, May 03, 2004 at 12:57:12PM +0530, Srinivas G. wrote:

 > We developed a driver for PCI card. It was compiled and working fine under non-smp kernel. But when we port it into SMP kernel it is not working. System is going to hang permanently. What problem peter got at the following site, the same problem we got here. When we don't use spinlocks it is working fine under SMP kernel also. But when we use spinlocks it is not working under SMP kernel. The link peter posted the error I am sending here. 
 > http://www.linuxtv.org/mailinglists/linux-dvb/2002/06-2002/msg00178.html
 > I tried with spin_lock_irqsave(&xxx,flags) and spin_unlock_irqrestore(&xxx,flags). Then also system halts.
 > Why system is permanently hanging? What was the problem? Is their any OS problem?
 > We are using following configuration:
 > P4 HT Processor, RealTech 8139 Network card, Redhat 9.0 Kernel version 2.4.20-8smp.
 > Thanks in advance for any help you can come up with.

You forgot to include a pointer to the source for your driver.
Without which, no-one can help you.

		Dave