Commit aa77015c authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky

[S390] cio: fix stsch_reset.

Copy inline assembly of stsch and add "memory" to clobber list in order
to prevent gcc from optimizing away the checking of the global variable
"pgm_check_occured".
Signed-off-by: default avatarMichael Holzheu <holzheu@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 524a237e
...@@ -2,8 +2,7 @@ ...@@ -2,8 +2,7 @@
* drivers/s390/cio/cio.c * drivers/s390/cio/cio.c
* S/390 common I/O routines -- low level i/o calls * S/390 common I/O routines -- low level i/o calls
* *
* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, * Copyright (C) IBM Corp. 1999,2006
* IBM Corporation
* Author(s): Ingo Adlung (adlung@de.ibm.com) * Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com) * Arnd Bergmann (arndb@de.ibm.com)
...@@ -881,10 +880,18 @@ static void cio_reset_pgm_check_handler(void) ...@@ -881,10 +880,18 @@ static void cio_reset_pgm_check_handler(void)
static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
{ {
int rc; int rc;
register struct subchannel_id reg1 asm ("1") = schid;
pgm_check_occured = 0; pgm_check_occured = 0;
s390_reset_pgm_handler = cio_reset_pgm_check_handler; s390_reset_pgm_handler = cio_reset_pgm_check_handler;
rc = stsch(schid, addr);
asm volatile(
" stsch 0(%2)\n"
" ipm %0\n"
" srl %0,28"
: "=d" (rc)
: "d" (reg1), "a" (addr), "m" (*addr) : "memory", "cc");
s390_reset_pgm_handler = NULL; s390_reset_pgm_handler = NULL;
if (pgm_check_occured) if (pgm_check_occured)
return -EIO; return -EIO;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment