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

drivers/s390/cio/cio.c

+10 −3
Original line number Diff line number Diff line
@@ -2,8 +2,7 @@ 
 *  drivers/s390/cio/cio.c

 *   S/390 common I/O routines -- low level i/o calls

 *

 *    Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,

 *			      IBM Corporation

 *    Copyright (C) IBM Corp. 1999,2006

 *    Author(s): Ingo Adlung (adlung@de.ibm.com)

 *		 Cornelia Huck (cornelia.huck@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)

{

	int rc;

	register struct subchannel_id reg1 asm ("1") = schid;



	pgm_check_occured = 0;

	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;

	if (pgm_check_occured)

		return -EIO;