[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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 1766def5bc3fc7f4717904313c69b2a7879b6d86..a9a301866b3c1846f37792aa371620e2b3004415 100644 (file)
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -587,8 +587,13 @@ 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. */
-                       tsk->thread.pfault_wait = -1;
+                        * 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);
        } else {