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s390/ap: fix status returned by ap_qact()

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[ Upstream commit a2522c80f0 ]

Since commit 159491f3b5 ("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@linux.ibm.com>
Reported-by: Harald Freudenberger <freude@linux.ibm.com>
Fixes: 159491f3b5 ("s390/ap: rework assembler functions to use unions for in/out register variables")
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Halil Pasic 2023-02-09 00:00:24 +01:00 • committed by Justin Hammond
parent d1c5430057
commit 79acb83dc6
1 changed files with 4 additions and 1 deletions
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5
arch/s390/include/asm/ap.h
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@ -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;