[patch 13/17] s390: introduce for_each_subchannel.

From: Martin Schwidefsky
Date: Fri Dec 09 2005 - 10:28:47 EST

From: Cornelia Huck <cohuck@xxxxxxxxxx>

[patch 13/17] 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 <cohuck@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

---

drivers/s390/cio/blacklist.c | 46 ++---
drivers/s390/cio/chsc.c | 372 ++++++++++++++++++++++---------------------
drivers/s390/cio/cio.c | 79 ++++-----
drivers/s390/cio/css.c | 110 ++++++------
drivers/s390/cio/css.h | 1
5 files changed, 318 insertions(+), 290 deletions(-)

diff -urpN linux-2.6/drivers/s390/cio/blacklist.c linux-2.6-patched/drivers/s390/cio/blacklist.c
--- linux-2.6/drivers/s390/cio/blacklist.c 2005-12-09 14:25:56.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/blacklist.c 2005-12-09 14:25:56.000000000 +0100
@@ -219,6 +219,27 @@ is_blacklisted (int devno)
}

#ifdef CONFIG_PROC_FS
+static int
+__s390_redo_validation(struct subchannel_id schid, void *data)
+{
+ int ret;
+ struct subchannel *sch;
+
+ sch = get_subchannel_by_schid(schid);
+ if (sch) {
+ /* Already known. */
+ put_device(&sch->dev);
+ return 0;
+ }
+ ret = css_probe_device(schid);
+ if (ret == -ENXIO)
+ return ret; /* We're through. */
+ if (ret == -ENOMEM)
+ /* Stop validation for now. Bad, but no need for a panic. */
+ return ret;
+ return 0;
+}
+
/*
* Function: s390_redo_validation
* Look for no longer blacklisted devices
@@ -226,30 +247,9 @@ is_blacklisted (int devno)
static inline void
s390_redo_validation (void)
{
- struct subchannel_id schid;
-
CIO_TRACE_EVENT (0, "redoval");
- init_subchannel_id(&schid);
- do {
- int ret;
- struct subchannel *sch;
-
- sch = get_subchannel_by_schid(schid);
- if (sch) {
- /* Already known. */
- put_device(&sch->dev);
- continue;
- }
- ret = css_probe_device(schid);
- if (ret == -ENXIO)
- break; /* We're through. */
- if (ret == -ENOMEM)
- /*
- * Stop validation for now. Bad, but no need for a
- * panic.
- */
- break;
- } while (schid.sch_no++ < __MAX_SUBCHANNEL);
+
+ for_each_subchannel(__s390_redo_validation, NULL);
}

/*
diff -urpN linux-2.6/drivers/s390/cio/chsc.c linux-2.6-patched/drivers/s390/cio/chsc.c
--- linux-2.6/drivers/s390/cio/chsc.c 2005-12-09 14:25:56.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/chsc.c 2005-12-09 14:25:56.000000000 +0100
@@ -310,9 +310,14 @@ s390_set_chpid_offline( __u8 chpid)
queue_work(slow_path_wq, &slow_path_work);
}

+struct res_acc_data {
+ struct channel_path *chp;
+ u32 fla_mask;
+ u16 fla;
+};
+
static int
-s390_process_res_acc_sch(u8 chpid, __u16 fla, u32 fla_mask,
- struct subchannel *sch)
+s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
{
int found;
int chp;
@@ -324,8 +329,9 @@ s390_process_res_acc_sch(u8 chpid, __u16
* check if chpid is in information updated by ssd
*/
if (sch->ssd_info.valid &&
- sch->ssd_info.chpid[chp] == chpid &&
- (sch->ssd_info.fla[chp] & fla_mask) == fla) {
+ sch->ssd_info.chpid[chp] == res_data->chp->id &&
+ (sch->ssd_info.fla[chp] & res_data->fla_mask)
+ == res_data->fla) {
found = 1;
break;
}
@@ -345,18 +351,80 @@ s390_process_res_acc_sch(u8 chpid, __u16
return 0x80 >> chp;
}

+static inline int
+s390_process_res_acc_new_sch(struct subchannel_id schid)
+{
+ struct schib schib;
+ int ret;
+ /*
+ * We don't know the device yet, but since a path
+ * may be available now to the device we'll have
+ * to do recognition again.
+ * Since we don't have any idea about which chpid
+ * that beast may be on we'll have to do a stsch
+ * on all devices, grr...
+ */
+ if (stsch(schid, &schib))
+ /* We're through */
+ return need_rescan ? -EAGAIN : -ENXIO;
+
+ /* Put it on the slow path. */
+ ret = css_enqueue_subchannel_slow(schid);
+ if (ret) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ return -EAGAIN;
+ }
+ return 0;
+}
+
static int
-s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
+__s390_process_res_acc(struct subchannel_id schid, void *data)
{
+ int chp_mask, old_lpm;
+ struct res_acc_data *res_data;
struct subchannel *sch;
+
+ res_data = (struct res_acc_data *)data;
+ sch = get_subchannel_by_schid(schid);
+ if (!sch)
+ /* Check if a subchannel is newly available. */
+ return s390_process_res_acc_new_sch(schid);
+
+ spin_lock_irq(&sch->lock);
+
+ chp_mask = s390_process_res_acc_sch(res_data, sch);
+
+ if (chp_mask == 0) {
+ spin_unlock_irq(&sch->lock);
+ return 0;
+ }
+ old_lpm = sch->lpm;
+ sch->lpm = ((sch->schib.pmcw.pim &
+ sch->schib.pmcw.pam &
+ sch->schib.pmcw.pom)
+ | chp_mask) & sch->opm;
+ if (!old_lpm && sch->lpm)
+ device_trigger_reprobe(sch);
+ else if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+
+ spin_unlock_irq(&sch->lock);
+ put_device(&sch->dev);
+ return (res_data->fla_mask == 0xffff) ? -ENODEV : 0;
+}
+
+
+static int
+s390_process_res_acc (struct res_acc_data *res_data)
+{
int rc;
- struct subchannel_id schid;
char dbf_txt[15];

- sprintf(dbf_txt, "accpr%x", chpid);
+ sprintf(dbf_txt, "accpr%x", res_data->chp->id);
CIO_TRACE_EVENT( 2, dbf_txt);
- if (fla != 0) {
- sprintf(dbf_txt, "fla%x", fla);
+ if (res_data->fla != 0) {
+ sprintf(dbf_txt, "fla%x", res_data->fla);
CIO_TRACE_EVENT( 2, dbf_txt);
}

@@ -367,71 +435,11 @@ s390_process_res_acc (u8 chpid, __u16 fl
* The more information we have (info), the less scanning
* will we have to do.
*/
-
- if (!get_chp_status(chpid))
- return 0; /* no need to do the rest */
-
- rc = 0;
- init_subchannel_id(&schid);
- do {
- int chp_mask, old_lpm;
-
- sch = get_subchannel_by_schid(schid);
- if (!sch) {
- struct schib schib;
- int ret;
- /*
- * We don't know the device yet, but since a path
- * may be available now to the device we'll have
- * to do recognition again.
- * Since we don't have any idea about which chpid
- * that beast may be on we'll have to do a stsch
- * on all devices, grr...
- */
- if (stsch(schid, &schib)) {
- /* We're through */
- if (need_rescan)
- rc = -EAGAIN;
- break;
- }
- if (need_rescan) {
- rc = -EAGAIN;
- continue;
- }
- /* Put it on the slow path. */
- ret = css_enqueue_subchannel_slow(schid);
- if (ret) {
- css_clear_subchannel_slow_list();
- need_rescan = 1;
- }
- rc = -EAGAIN;
- continue;
- }
-
- spin_lock_irq(&sch->lock);
-
- chp_mask = s390_process_res_acc_sch(chpid, fla, fla_mask, sch);
-
- if (chp_mask == 0) {
-
- spin_unlock_irq(&sch->lock);
- continue;
- }
- old_lpm = sch->lpm;
- sch->lpm = ((sch->schib.pmcw.pim &
- sch->schib.pmcw.pam &
- sch->schib.pmcw.pom)
- | chp_mask) & sch->opm;
- if (!old_lpm && sch->lpm)
- device_trigger_reprobe(sch);
- else if (sch->driver && sch->driver->verify)
- sch->driver->verify(&sch->dev);
-
- spin_unlock_irq(&sch->lock);
- put_device(&sch->dev);
- if (fla_mask == 0xffff)
- break;
- } while (schid.sch_no++ < __MAX_SUBCHANNEL);
+ rc = for_each_subchannel(__s390_process_res_acc, res_data);
+ if (css_slow_subchannels_exist())
+ rc = -EAGAIN;
+ else if (rc != -EAGAIN)
+ rc = 0;
return rc;
}

@@ -469,6 +477,7 @@ int
chsc_process_crw(void)
{
int chpid, ret;
+ struct res_acc_data res_data;
struct {
struct chsc_header request;
u32 reserved1;
@@ -503,7 +512,7 @@ chsc_process_crw(void)
do {
int ccode, status;
memset(sei_area, 0, sizeof(*sei_area));
-
+ memset(&res_data, 0, sizeof(struct res_acc_data));
sei_area->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x000e,
@@ -576,26 +585,23 @@ chsc_process_crw(void)
if (status < 0)
new_channel_path(sei_area->rsid);
else if (!status)
- return 0;
- if ((sei_area->vf & 0x80) == 0) {
- pr_debug("chpid: %x\n", sei_area->rsid);
- ret = s390_process_res_acc(sei_area->rsid,
- 0, 0);
- } else if ((sei_area->vf & 0xc0) == 0x80) {
- pr_debug("chpid: %x link addr: %x\n",
- sei_area->rsid, sei_area->fla);
- ret = s390_process_res_acc(sei_area->rsid,
- sei_area->fla,
- 0xff00);
- } else if ((sei_area->vf & 0xc0) == 0xc0) {
- pr_debug("chpid: %x full link addr: %x\n",
- sei_area->rsid, sei_area->fla);
- ret = s390_process_res_acc(sei_area->rsid,
- sei_area->fla,
- 0xffff);
+ break;
+ res_data.chp = chps[sei_area->rsid];
+ pr_debug("chpid: %x", sei_area->rsid);
+ if ((sei_area->vf & 0xc0) != 0) {
+ res_data.fla = sei_area->fla;
+ if ((sei_area->vf & 0xc0) == 0xc0) {
+ pr_debug(" full link addr: %x",
+ sei_area->fla);
+ res_data.fla_mask = 0xffff;
+ } else {
+ pr_debug(" link addr: %x",
+ sei_area->fla);
+ res_data.fla_mask = 0xff00;
+ }
}
- pr_debug("\n");
-
+ ret = s390_process_res_acc(&res_data);
+ pr_debug("\n\n");
break;

default: /* other stuff */
@@ -607,12 +613,70 @@ chsc_process_crw(void)
return ret;
}

+static inline int
+__chp_add_new_sch(struct subchannel_id schid)
+{
+ struct schib schib;
+ int ret;
+
+ if (stsch(schid, &schib))
+ /* We're through */
+ return need_rescan ? -EAGAIN : -ENXIO;
+
+ /* Put it on the slow path. */
+ ret = css_enqueue_subchannel_slow(schid);
+ if (ret) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+
static int
-chp_add(int chpid)
+__chp_add(struct subchannel_id schid, void *data)
{
+ int i;
+ struct channel_path *chp;
struct subchannel *sch;
- int ret, rc;
- struct subchannel_id schid;
+
+ chp = (struct channel_path *)data;
+ sch = get_subchannel_by_schid(schid);
+ if (!sch)
+ /* Check if the subchannel is now available. */
+ return __chp_add_new_sch(schid);
+ spin_lock(&sch->lock);
+ for (i=0; i<8; i++)
+ if (sch->schib.pmcw.chpid[i] == chp->id) {
+ if (stsch(sch->schid, &sch->schib) != 0) {
+ /* Endgame. */
+ spin_unlock(&sch->lock);
+ return -ENXIO;
+ }
+ break;
+ }
+ if (i==8) {
+ spin_unlock(&sch->lock);
+ return 0;
+ }
+ sch->lpm = ((sch->schib.pmcw.pim &
+ sch->schib.pmcw.pam &
+ sch->schib.pmcw.pom)
+ | 0x80 >> i) & sch->opm;
+
+ if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+
+ spin_unlock(&sch->lock);
+ put_device(&sch->dev);
+ return 0;
+}
+
+static int
+chp_add(int chpid)
+{
+ int rc;
char dbf_txt[15];

if (!get_chp_status(chpid))
@@ -621,60 +685,11 @@ chp_add(int chpid)
sprintf(dbf_txt, "cadd%x", chpid);
CIO_TRACE_EVENT(2, dbf_txt);

- rc = 0;
- init_subchannel_id(&schid);
- do {
- int i;
-
- sch = get_subchannel_by_schid(schid);
- if (!sch) {
- struct schib schib;
-
- if (stsch(schid, &schib)) {
- /* We're through */
- if (need_rescan)
- rc = -EAGAIN;
- break;
- }
- if (need_rescan) {
- rc = -EAGAIN;
- continue;
- }
- /* Put it on the slow path. */
- ret = css_enqueue_subchannel_slow(schid);
- if (ret) {
- css_clear_subchannel_slow_list();
- need_rescan = 1;
- }
- rc = -EAGAIN;
- continue;
- }
-
- spin_lock(&sch->lock);
- for (i=0; i<8; i++)
- if (sch->schib.pmcw.chpid[i] == chpid) {
- if (stsch(sch->schid, &sch->schib) != 0) {
- /* Endgame. */
- spin_unlock(&sch->lock);
- return rc;
- }
- break;
- }
- if (i==8) {
- spin_unlock(&sch->lock);
- return rc;
- }
- sch->lpm = ((sch->schib.pmcw.pim &
- sch->schib.pmcw.pam &
- sch->schib.pmcw.pom)
- | 0x80 >> i) & sch->opm;
-
- if (sch->driver && sch->driver->verify)
- sch->driver->verify(&sch->dev);
-
- spin_unlock(&sch->lock);
- put_device(&sch->dev);
- } while (schid.sch_no++ < __MAX_SUBCHANNEL);
+ rc = for_each_subchannel(__chp_add, chps[chpid]);
+ if (css_slow_subchannels_exist())
+ rc = -EAGAIN;
+ if (rc != -EAGAIN)
+ rc = 0;
return rc;
}

@@ -786,6 +801,29 @@ s390_subchannel_vary_chpid_on(struct dev
return 0;
}

+static int
+__s390_vary_chpid_on(struct subchannel_id schid, void *data)
+{
+ struct schib schib;
+ struct subchannel *sch;
+
+ sch = get_subchannel_by_schid(schid);
+ if (sch) {
+ put_device(&sch->dev);
+ return 0;
+ }
+ if (stsch(schid, &schib))
+ /* We're through */
+ return -ENXIO;
+ /* Put it on the slow path. */
+ if (css_enqueue_subchannel_slow(schid)) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ return -EAGAIN;
+ }
+ return 0;
+}
+
/*
* Function: s390_vary_chpid
* Varies the specified chpid online or offline
@@ -794,9 +832,7 @@ static int
s390_vary_chpid( __u8 chpid, int on)
{
char dbf_text[15];
- int status, ret;
- struct subchannel_id schid;
- struct subchannel *sch;
+ int status;

sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
CIO_TRACE_EVENT( 2, dbf_text);
@@ -821,31 +857,9 @@ s390_vary_chpid( __u8 chpid, int on)
bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
s390_subchannel_vary_chpid_on :
s390_subchannel_vary_chpid_off);
- if (!on)
- goto out;
- /* Scan for new devices on varied on path. */
- init_subchannel_id(&schid);
- do {
- struct schib schib;
-
- if (need_rescan)
- break;
- sch = get_subchannel_by_schid(schid);
- if (sch) {
- put_device(&sch->dev);
- continue;
- }
- if (stsch(schid, &schib))
- /* We're through */
- break;
- /* Put it on the slow path. */
- ret = css_enqueue_subchannel_slow(schid);
- if (ret) {
- css_clear_subchannel_slow_list();
- need_rescan = 1;
- }
- } while (schid.sch_no++ < __MAX_SUBCHANNEL);
-out:
+ if (on)
+ /* Scan for new devices on varied on path. */
+ for_each_subchannel(__s390_vary_chpid_on, NULL);
if (need_rescan || css_slow_subchannels_exist())
queue_work(slow_path_wq, &slow_path_work);
return 0;
diff -urpN linux-2.6/drivers/s390/cio/cio.c linux-2.6-patched/drivers/s390/cio/cio.c
--- linux-2.6/drivers/s390/cio/cio.c 2005-12-09 14:25:56.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/cio.c 2005-12-09 14:25:56.000000000 +0100
@@ -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 subchanne
}

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. */
diff -urpN linux-2.6/drivers/s390/cio/css.c linux-2.6-patched/drivers/s390/cio/css.c
--- linux-2.6/drivers/s390/cio/css.c 2005-12-09 14:25:56.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/css.c 2005-12-09 14:25:56.000000000 +0100
@@ -21,7 +21,6 @@
#include "ioasm.h"
#include "chsc.h"

-unsigned int highest_subchannel;
int need_rescan = 0;
int css_init_done = 0;

@@ -32,6 +31,22 @@ struct device css_bus_device = {
.bus_id = "css0",
};

+inline int
+for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
+{
+ struct subchannel_id schid;
+ int ret;
+
+ init_subchannel_id(&schid);
+ ret = -ENODEV;
+ do {
+ ret = fn(schid, data);
+ if (ret)
+ break;
+ } while (schid.sch_no++ < __MAX_SUBCHANNEL);
+ return ret;
+}
+
static struct subchannel *
css_alloc_subchannel(struct subchannel_id schid)
{
@@ -280,25 +295,10 @@ css_evaluate_subchannel(struct subchanne
return ret;
}

-static void
-css_rescan_devices(void)
+static int
+css_rescan_devices(struct subchannel_id schid, void *data)
{
- int ret;
- struct subchannel_id schid;
-
- init_subchannel_id(&schid);
- do {
- ret = css_evaluate_subchannel(schid, 1);
- /* No more memory. It doesn't make sense to continue. No
- * panic because this can happen in midflight and just
- * because we can't use a new device is no reason to crash
- * the system. */
- if (ret == -ENOMEM)
- break;
- /* -ENXIO indicates that there are no more subchannels. */
- if (ret == -ENXIO)
- break;
- } while (schid.sch_no++ < __MAX_SUBCHANNEL);
+ return css_evaluate_subchannel(schid, 1);
}

struct slow_subchannel {
@@ -316,7 +316,7 @@ css_trigger_slow_path(void)

if (need_rescan) {
need_rescan = 0;
- css_rescan_devices();
+ for_each_subchannel(css_rescan_devices, NULL);
return;
}

@@ -383,6 +383,43 @@ css_process_crw(int irq)
return ret;
}

+static int __init
+__init_channel_subsystem(struct subchannel_id schid, void *data)
+{
+ struct subchannel *sch;
+ int ret;
+
+ if (cio_is_console(schid))
+ sch = cio_get_console_subchannel();
+ else {
+ sch = css_alloc_subchannel(schid);
+ if (IS_ERR(sch))
+ ret = PTR_ERR(sch);
+ else
+ ret = 0;
+ switch (ret) {
+ case 0:
+ break;
+ case -ENOMEM:
+ panic("Out of memory in init_channel_subsystem\n");
+ /* -ENXIO: no more subchannels. */
+ case -ENXIO:
+ return ret;
+ default:
+ return 0;
+ }
+ }
+ /*
+ * We register ALL valid subchannels in ioinfo, even those
+ * that have been present before init_channel_subsystem.
+ * These subchannels can't have been registered yet (kmalloc
+ * not working) so we do it now. This is true e.g. for the
+ * console subchannel.
+ */
+ css_register_subchannel(sch);
+ return 0;
+}
+
static void __init
css_generate_pgid(void)
{
@@ -410,7 +447,6 @@ static int __init
init_channel_subsystem (void)
{
int ret;
- struct subchannel_id schid;

if (chsc_determine_css_characteristics() == 0)
css_characteristics_avail = 1;
@@ -426,38 +462,8 @@ init_channel_subsystem (void)

ctl_set_bit(6, 28);

- init_subchannel_id(&schid);
- do {
- struct subchannel *sch;
-
- if (cio_is_console(schid))
- sch = cio_get_console_subchannel();
- else {
- sch = css_alloc_subchannel(schid);
- if (IS_ERR(sch))
- ret = PTR_ERR(sch);
- else
- ret = 0;
- if (ret == -ENOMEM)
- panic("Out of memory in "
- "init_channel_subsystem\n");
- /* -ENXIO: no more subchannels. */
- if (ret == -ENXIO)
- break;
- if (ret)
- continue;
- }
- /*
- * We register ALL valid subchannels in ioinfo, even those
- * that have been present before init_channel_subsystem.
- * These subchannels can't have been registered yet (kmalloc
- * not working) so we do it now. This is true e.g. for the
- * console subchannel.
- */
- css_register_subchannel(sch);
- } while (schid.sch_no++ < __MAX_SUBCHANNEL);
+ for_each_subchannel(__init_channel_subsystem, NULL);
return 0;
-
out_bus:
bus_unregister(&css_bus_type);
out:
diff -urpN linux-2.6/drivers/s390/cio/css.h linux-2.6-patched/drivers/s390/cio/css.h
--- linux-2.6/drivers/s390/cio/css.h 2005-12-09 14:25:56.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/css.h 2005-12-09 14:25:56.000000000 +0100
@@ -126,6 +126,7 @@ extern struct css_driver io_subchannel_d
extern int css_probe_device(struct subchannel_id);
extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
extern int css_init_done;
+extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);

#define __MAX_SUBCHANNEL 65535

-
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