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authorPeter Oberparleiter2015-12-18 12:59:28 +0100
committerMartin Schwidefsky2015-12-18 14:59:34 +0100
commitac357c4105ef6b2d44227aa349850a3c1a2994a5 (patch)
tree6f9a2c457964f50c5472a6ba1bfcbf5ec7152be2 /drivers/s390
parent62e65da994768e0d599d78dd2cebef5716ffb0ae (diff)
s390/cio: Fix incorrect xsch opcode specification
The numeric representation of the xsch instruction was incorrectly specified, resulting in reserved fields of the instruction opcode potentially being set to a non-zero value. While this doesn't currently cause any problem, a future architecture might make use of these fields so that the current specification could result in an exception or unwanted side-effects. Fix this by using the xsch instruction code for which support in binutils was added in 2003. Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/io_sch.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h
index b108f4a5c7dd..789ce783d3e1 100644
--- a/drivers/s390/cio/io_sch.h
+++ b/drivers/s390/cio/io_sch.h
@@ -205,7 +205,7 @@ static inline int xsch(struct subchannel_id schid)
int ccode;
asm volatile(
- " .insn rre,0xb2760000,%1,0\n"
+ " xsch\n"
" ipm %0\n"
" srl %0,28"
: "=d" (ccode)