forked from luck/tmp_suning_uos_patched
[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: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -2,8 +2,7 @@
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* drivers/s390/cio/cio.c
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* S/390 common I/O routines -- low level i/o calls
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*
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* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Copyright (C) IBM Corp. 1999,2006
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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@ -881,10 +880,18 @@ static void cio_reset_pgm_check_handler(void)
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static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
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{
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int rc;
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register struct subchannel_id reg1 asm ("1") = schid;
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pgm_check_occured = 0;
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s390_reset_pgm_handler = cio_reset_pgm_check_handler;
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rc = stsch(schid, addr);
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asm volatile(
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" stsch 0(%2)\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (rc)
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: "d" (reg1), "a" (addr), "m" (*addr) : "memory", "cc");
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s390_reset_pgm_handler = NULL;
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if (pgm_check_occured)
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return -EIO;
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