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/*
* Copyright (c) 2013 Luis R. Rodriguez <mcgrof@do-not-panic.com>
*
* Backport functionality introduced in Linux 3.9.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/device.h>
#include <linux/err.h>
#ifdef __sg_page_iter_next
void __sg_page_iter_start(struct sg_page_iter *piter,
struct scatterlist *sglist, unsigned int nents,
unsigned long pgoffset)
{
piter->__pg_advance = 0;
piter->__nents = nents;
piter->page = NULL;
piter->sg = sglist;
piter->sg_pgoffset = pgoffset;
}
EXPORT_SYMBOL_GPL(__sg_page_iter_start);
static int sg_page_count(struct scatterlist *sg)
{
return PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT;
}
bool __sg_page_iter_next(struct sg_page_iter *piter)
{
if (!piter->__nents || !piter->sg)
return false;
piter->sg_pgoffset += piter->__pg_advance;
piter->__pg_advance = 1;
while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {
piter->sg_pgoffset -= sg_page_count(piter->sg);
piter->sg = sg_next(piter->sg);
if (!--piter->__nents || !piter->sg)
return false;
}
piter->page = nth_page(sg_page(piter->sg), piter->sg_pgoffset);
return true;
}
EXPORT_SYMBOL_GPL(__sg_page_iter_next);
void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
{
void __iomem *dest_ptr;
dest_ptr = devm_ioremap_resource(dev, res);
if (!dest_ptr)
return (void __iomem *)ERR_PTR(-ENOMEM);
return dest_ptr;
}
EXPORT_SYMBOL_GPL(devm_ioremap_resource);
#endif /* __sg_page_iter_next */
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