From f97a56fb768e5fe9cd07c56ca47870136bb5530c Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Fri, 6 Jan 2006 00:19:22 -0800 Subject: [PATCH] s390: introduce for_each_subchannel 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 Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/s390/cio/cio.c | 79 +++++++++++++++++++++++++++----------------------- 1 file changed, 43 insertions(+), 36 deletions(-) (limited to 'drivers/s390/cio/cio.c') diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 396bada65f86..3eb6cb608fc9 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -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. */ -- cgit v1.2.3