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[PATCH] s390: introduce for_each_subchannel

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for_each_subchannel() is an iterator calling a function for every possible
subchannel id until non-zero is returned.  Convert the current iterating
functions to it.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Cornelia Huck
2006-01-06 00:19:22 -08:00
committed by Linus Torvalds
parent a8237fc410
commit f97a56fb76
5 changed files with 318 additions and 290 deletions
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79
drivers/s390/cio/cio.c
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@@ -691,7 +691,22 @@ wait_cons_dev (void)
}
static int
cio_console_irq(void)
cio_test_for_console(struct subchannel_id schid, void *data)
{
if (stsch(schid, &console_subchannel.schib) != 0)
return -ENXIO;
if (console_subchannel.schib.pmcw.dnv &&
console_subchannel.schib.pmcw.dev ==
console_devno) {
console_irq = schid.sch_no;
return 1; /* found */
}
return 0;
}
static int
cio_get_console_sch_no(void)
{
struct subchannel_id schid;
@@ -705,16 +720,7 @@ cio_console_irq(void)
console_devno = console_subchannel.schib.pmcw.dev;
} else if (console_devno != -1) {
/* At least the console device number is known. */
do {
if (stsch(schid, &console_subchannel.schib) != 0)
break;
if (console_subchannel.schib.pmcw.dnv &&
console_subchannel.schib.pmcw.dev ==
console_devno) {
console_irq = schid.sch_no;
break;
}
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
for_each_subchannel(cio_test_for_console, NULL);
if (console_irq == -1)
return -1;
} else {
@@ -730,19 +736,19 @@ cio_console_irq(void)
struct subchannel *
cio_probe_console(void)
{
int irq, ret;
int sch_no, ret;
struct subchannel_id schid;
if (xchg(&console_subchannel_in_use, 1) != 0)
return ERR_PTR(-EBUSY);
irq = cio_console_irq();
if (irq == -1) {
sch_no = cio_get_console_sch_no();
if (sch_no == -1) {
console_subchannel_in_use = 0;
return ERR_PTR(-ENODEV);
}
memset(&console_subchannel, 0, sizeof(struct subchannel));
init_subchannel_id(&schid);
schid.sch_no = irq;
schid.sch_no = sch_no;
ret = cio_validate_subchannel(&console_subchannel, schid);
if (ret) {
console_subchannel_in_use = 0;
@@ -830,32 +836,33 @@ __clear_subchannel_easy(struct subchannel_id schid)
}
extern void do_reipl(unsigned long devno);
static int
__shutdown_subchannel_easy(struct subchannel_id schid, void *data)
{
struct schib schib;
if (stsch(schid, &schib))
return -ENXIO;
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
return 0;
}
/* Clear all subchannels. */
void
clear_all_subchannels(void)
{
struct subchannel_id schid;
local_irq_disable();
init_subchannel_id(&schid);
do {
struct schib schib;
if (stsch(schid, &schib))
break; /* break out of the loop */
if (!schib.pmcw.ena)
continue;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... jump out of switch */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
for_each_subchannel(__shutdown_subchannel_easy, NULL);
}
/* Make sure all subchannels are quiet before we re-ipl an lpar. */