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resources: tidy __request_region()

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No functional change.  Just return NULL for kzalloc failure immediately,
rather than wrapping the whole function body in the body of an "if".

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bjorn Helgaas 2008-10-15 22:05:14 -07:00 committed by Linus Torvalds
parent 923f7f6970
commit c26ec88ea8
1 changed files with 21 additions and 20 deletions
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41
kernel/resource.c
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@ -630,33 +630,34 @@ struct resource * __request_region(struct resource *parent,
{
struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
if (res) {
res->name = name;
res->start = start;
res->end = start + n - 1;
res->flags = IORESOURCE_BUSY;
if (!res)
return NULL;
write_lock(&resource_lock);
res->name = name;
res->start = start;
res->end = start + n - 1;
res->flags = IORESOURCE_BUSY;
for (;;) {
struct resource *conflict;
write_lock(&resource_lock);
conflict = __request_resource(parent, res);
if (!conflict)
break;
if (conflict != parent) {
parent = conflict;
if (!(conflict->flags & IORESOURCE_BUSY))
continue;
}
for (;;) {
struct resource *conflict;
/* Uhhuh, that didn't work out.. */
kfree(res);
res = NULL;
conflict = __request_resource(parent, res);
if (!conflict)
break;
if (conflict != parent) {
parent = conflict;
if (!(conflict->flags & IORESOURCE_BUSY))
continue;
}
write_unlock(&resource_lock);
/* Uhhuh, that didn't work out.. */
kfree(res);
res = NULL;
break;
}
write_unlock(&resource_lock);
return res;
}
EXPORT_SYMBOL(__request_region);