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RE: Understanding Interrupts

 
->   Yes, the main purpose of disabling interrupts is to
->   avoid reentrancy of same interrupt handler and 
->   synchronization of shared data. Note that there is no 
->   need to protect code. Data needs protection.

  Note also that disabling interrupts is not a sufficient
  condition for synchronization. It is just a necessary one.
  To protect global data, some times, kernel uses proper
  locking (for example, spin locks etc).

Venkata.

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