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memremap: simplify duplicate region handling in devm_memremap_pages 

__radix_tree_insert already checks for duplicates and returns -EEXIST in
that case, so remove the duplicate (and racy) duplicates check.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
hifive-unleashed-5.1
Christoph Hellwig 2017-12-29 08:54:03 +01:00 committed by Dan Williams
parent 0628b8c650
commit 7003e3b1f6
1 changed files with 0 additions and 11 deletions
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11
kernel/memremap.c
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@ -396,17 +396,6 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
align_end = align_start + align_size - 1;
foreach_order_pgoff(res, order, pgoff) {
struct dev_pagemap *dup;
rcu_read_lock();
dup = find_dev_pagemap(res->start + PFN_PHYS(pgoff));
rcu_read_unlock();
if (dup) {
dev_err(dev, "%s: %pr collides with mapping for %s\n",
__func__, res, dev_name(dup->dev));
error = -EBUSY;
break;
}
error = __radix_tree_insert(&pgmap_radix,
PHYS_PFN(res->start) + pgoff, order, page_map);
if (error) {