[Meego-kernel] Error Handling for wait_for_completion_interruptible_timeout

[Popescu, CatalinX]

I have a question regarding the synchronization mechanism wait_for_completion_interruptible_timeout. Sometimes, it just returns an ERESTARTSYS error because the scheduler detects a pending signal : TIF_SIGPENDING is set into thread_info. But looking at sigpending from task_struct there are no pending signals...

What is the driver supposed to do when receiving ERESTARTSYS in general case? Is it supposed to return EAGAIN so the signal gets handled by user space?

In this particular case, when there are no real signals pending, is the driver allowed to call recalc_sigpending or any equivalent function in order to clear flag TIF_SIGPENDING and issue another call to wait_for_completion_interruptible_timeout (this time blocking) ?

Thank you for your feedback.

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