s390/cio/ioasm: Fix __xsch() condition code handling

commit f0edc8f upstream.

For the __xsch() inline assembly the conversion to flag output macros is
incomplete. Only the conditional shift of the return value was added, while
the required changes to the inline assembly itself are missing.

If compiled with GCC versions before 14.2 this leads to a double shift of
the cc output operand and therefore the returned value of __xsch() is
incorrectly always zero, instead of the expected condition code.

Fixes: e200565 ("s390/cio/ioasm: Convert to use flag output macros")
Cc: [email protected]
Signed-off-by: Heiko Carstens <[email protected]>
Acked-by: Alexander Gordeev <[email protected]>
Reviewed-by: Juergen Christ <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: hcahca

drivers/s390/cio/ioasm.c

@@ -253,11 +253,10 @@ static inline int __xsch(struct subchannel_id schid)
 	asm volatile(
 		"	lgr	1,%[r1]\n"
 		"	xsch\n"
-		"	ipm	%[cc]\n"
-		"	srl	%[cc],28\n"
-		: [cc] "=&d" (ccode)
+		CC_IPM(cc)
+		: CC_OUT(cc, ccode)
 		: [r1] "d" (r1)
-		: "cc", "1");
+		: CC_CLOBBER_LIST("1"));
 	return CC_TRANSFORM(ccode);
 }