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authorHeiko Carstens <heiko.carstens@de.ibm.com>2011-11-14 14:19:01 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-11-14 14:19:08 +0400
commitfa2fb2f4a599c402bb2670dde27867dbbb7e3c45 (patch)
tree12e69f3d36d229b5b10320943a4135977c075ebb /arch
parent09b538833b85521d937a06faf61e6a3273253cc0 (diff)
downloadlinux-fa2fb2f4a599c402bb2670dde27867dbbb7e3c45.tar.xz
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/mm/fault.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 1766def5bc3f..a9a301866b3c 100644
--- 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 {