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[S390] cio: fix stsch_reset.

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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: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2006-12-28 00:35:36 +01:00 • committed by Martin Schwidefsky
parent 524a237e45
commit aa77015c4e
1 changed files with 10 additions and 3 deletions
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13
drivers/s390/cio/cio.c
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@ -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)
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;