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Commit fa2fb2f4 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[S390] pfault: ignore leftover completion interrupts 



Ignore completion interrupts if the initial interrupt hasn't been
received and the addressed task is not running. This case can only
happen if leftover (pending) completion interrupt gets delivered
which wasn't removed with the PFAULT CANCEL operation during cpu
hotplug.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 09b53883

arch/s390/mm/fault.c

+7 −2
Original line number Diff line number Diff line
@@ -587,7 +587,12 @@ static void pfault_interrupt(unsigned int ext_int_code, 
		} else {

			/* Completion interrupt was faster than initial

			 * interrupt. Set pfault_wait to -1 so the initial

			 * interrupt doesn't put the task to sleep. */

			 * interrupt doesn't put the task to sleep.

			 * If the task is not running, ignore the completion

			 * interrupt since it must be a leftover of a PFAULT

			 * CANCEL operation which didn't remove all pending

			 * completion interrupts. */

			if (tsk->state == TASK_RUNNING)

				tsk->thread.pfault_wait = -1;

		}

		put_task_struct(tsk);