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[S390] cio: device scan oom fallback. 

Since some callers rely on for_each_subchannel_staged to not fail,
fall back to brute force scanning using get_subchannel_by_schid in
case of a oom situation.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2009-03-26 15:24:11 +01:00 committed by Martin Schwidefsky
parent 87fa5af80c
commit 90ac24a5ae
1 changed files with 27 additions and 4 deletions
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31
drivers/s390/cio/css.c
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@ -83,6 +83,25 @@ static int call_fn_unknown_sch(struct subchannel_id schid, void *data)
return rc;
}
static int call_fn_all_sch(struct subchannel_id schid, void *data)
{
struct cb_data *cb = data;
struct subchannel *sch;
int rc = 0;
sch = get_subchannel_by_schid(schid);
if (sch) {
if (cb->fn_known_sch)
rc = cb->fn_known_sch(sch, cb->data);
put_device(&sch->dev);
} else {
if (cb->fn_unknown_sch)
rc = cb->fn_unknown_sch(schid, cb->data);
}
return rc;
}
int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
int (*fn_unknown)(struct subchannel_id,
void *), void *data)
@ -90,13 +109,17 @@ int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
struct cb_data cb;
int rc;
cb.set = idset_sch_new();
if (!cb.set)
return -ENOMEM;
idset_fill(cb.set);
cb.data = data;
cb.fn_known_sch = fn_known;
cb.fn_unknown_sch = fn_unknown;
cb.set = idset_sch_new();
if (!cb.set)
/* fall back to brute force scanning in case of oom */
return for_each_subchannel(call_fn_all_sch, &cb);
idset_fill(cb.set);
/* Process registered subchannels. */
rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch);
if (rc)