Getting error scheduling while atomic.

["Ranjan Sinha" <rnjn.sinha@xxxxxxxxx>]

Hi All,

I am getting an error "Scheduling while atomic" very infrequently on
Linux 2.6.14 kernel on MIPS architecture with this piece of my kernel
module (Mymodule.ko) . My kernel module codes look like :

//This function is called from the process context
fn_in_process_context ()
{
   //some code here
   in_use = 1;
   wait_event (queue, in_use==0);
   //some more code

}

//This function is called from the interrupt context.....in bottom half
callback_fn_in_interrupt_context()
{
  //some code here
  in_use = 0;
  wake_up (queue);
  //some more code

}

The commented out code is just lots of assignment to local variable etc.

and the call stack looks like :

scheduling while atomic: mymodule/0xffffff00/564

Call Trace:

[<803fc3c0>] schedule+0x74/0x980
[<8011cbec>] __wake_up+0x34/0x64
[<803fc34c>] schedule+0x0/0x980
[<80138548>] prepare_to_wait+0x0/0x7c
[<c00553b0>] fn_in_process_context+0x32c/0x578 [mymodule]
[<80126510>] irq_exit+0x40/0x4c
[<80126348>] __do_softirq+0x68/0xec
[<801386a8>] autoremove_wake_function+0x0/0x44
[<802be1e4>] __copy_user+0x0/0x1c
[<801386a8>] autoremove_wake_function+0x0/0x44
[<801386a8>] autoremove_wake_function+0x0/0x44

Does wake_up() function somehow calls the schedule() ? Is it safe to
call wake_up from interrupt context?
Or there is something else that is responsible for this error ?

--
Best regards,
Ranjan

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