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open a file in spin_lock_irq()

Hello,

 I wrote a piece of kernel code that deals with new structure. Those stucture
are manipulated by a driver. So, I implemented a classical ioctl() with a switch
to select appropriate action to perform. One of this action is to remove a data
from a list:

int my_ioctl(...) {
  ...
  switch(cmd) {
 

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