From: Halil Pasic <pasic@xxxxxxxxxxxxx>
[ Upstream commit a2522c80f074c35254974fec39fffe8b8d75befe ]
Since commit 159491f3b509 ("s390/ap: rework assembler functions to use
unions for in/out register variables") the function ap_qact() tries to
grab the status from the wrong part of the register. Thus we always end
up with zeros. Which is wrong, among others, because we detect failures
via status.response_code.
Signed-off-by: Halil Pasic <pasic@xxxxxxxxxxxxx>
Reported-by: Harald Freudenberger <freude@xxxxxxxxxxxxx>
Fixes: 159491f3b509 ("s390/ap: rework assembler functions to use unions for in/out register variables")
Reviewed-by: Harald Freudenberger <freude@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/s390/include/asm/ap.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index 8a8c0b157b551..859e6d87b108b 100644
--- a/arch/s390/include/asm/ap.h
+++ b/arch/s390/include/asm/ap.h
@@ -290,7 +290,10 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
unsigned long reg0 = qid | (5UL << 24) | ((ifbit & 0x01) << 22);
union {
unsigned long value;
- struct ap_queue_status status;
+ struct {
+ u32 _pad;
+ struct ap_queue_status status;
+ };
} reg1;
unsigned long reg2;
--
2.39.2
