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resources: fix call to alignf() in allocate_resource() 

The second parameter to alignf() in allocate_resource() must
reflect what new resource is attempted to be allocated, else
functions like pcibios_align_resource() (at least on x86) or
pcmcia_align() can't work correctly.

Commit 1e5ad96790 broke this by
setting the "new" resource until we're about to return success.
To keep the resource untouched when allocate_resource() fails,
a "tmp" resource is introduced.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dominik Brodowski 2009-12-20 10:50:02 +01:00 committed by Linus Torvalds
parent f7b84a6ba7
commit 0e2c8b8f55
1 changed files with 16 additions and 16 deletions
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32
kernel/resource.c
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@ -308,37 +308,37 @@ static int find_resource(struct resource *root, struct resource *new,
void *alignf_data)
{
struct resource *this = root->child;
resource_size_t start, end;
struct resource tmp = *new;
start = root->start;
tmp.start = root->start;
/*
* Skip past an allocated resource that starts at 0, since the assignment
* of this->start - 1 to new->end below would cause an underflow.
* of this->start - 1 to tmp->end below would cause an underflow.
*/
if (this && this->start == 0) {
start = this->end + 1;
tmp.start = this->end + 1;
this = this->sibling;
}
for(;;) {
if (this)
end = this->start - 1;
tmp.end = this->start - 1;
else
end = root->end;
if (start < min)
start = min;
if (end > max)
end = max;
start = ALIGN(start, align);
tmp.end = root->end;
if (tmp.start < min)
tmp.start = min;
if (tmp.end > max)
tmp.end = max;
tmp.start = ALIGN(tmp.start, align);
if (alignf)
alignf(alignf_data, new, size, align);
if (start < end && end - start >= size - 1) {
new->start = start;
new->end = start + size - 1;
alignf(alignf_data, &tmp, size, align);
if (tmp.start < tmp.end && tmp.end - tmp.start >= size - 1) {
new->start = tmp.start;
new->end = tmp.start + size - 1;
return 0;
}
if (!this)
break;
start = this->end + 1;
tmp.start = this->end + 1;
this = this->sibling;
}
return -EBUSY;