BUG: scheduling while atomic

[Dave Hylands]

Hi Arun,

On Tue, Apr 17, 2012 at 11:44 PM, Arun KS <getarunks at gmail.com> wrote:
>
> Hello Guys,
>
> System is working normal after this BUG.
> PC is at 0x400b4614, probably a mmaped address.
>
> Just wondering how can this BUG happen when a process is running in user
> space.
>
> Can it be something like this
> 1) enter to kernel from userspace through some system call.
> 2) kernel disables the interrupt and return to user space.

Don't do that.

> 3) and now it can happen in user space?

Because something in userspace made a blocking call which would cause
a context switch to occur and your driver erroneously left interrupts
disabled.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com