diff options
Diffstat (limited to 'drivers/staging/rtl8192u/ieee80211/scatterwalk.c')
-rw-r--r-- | drivers/staging/rtl8192u/ieee80211/scatterwalk.c | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/drivers/staging/rtl8192u/ieee80211/scatterwalk.c b/drivers/staging/rtl8192u/ieee80211/scatterwalk.c deleted file mode 100644 index 8b73f6cefcf9..000000000000 --- a/drivers/staging/rtl8192u/ieee80211/scatterwalk.c +++ /dev/null @@ -1,117 +0,0 @@ -/* - * Cryptographic API. - * - * Cipher operations. - * - * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> - * 2002 Adam J. Richter <adam@yggdrasil.com> - * 2004 Jean-Luc Cooke <jlcooke@certainkey.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the Free - * Software Foundation; either version 2 of the License, or (at your option) - * any later version. - * - */ -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/pagemap.h> -#include <linux/highmem.h> -#include <asm/scatterlist.h> -#include "internal.h" -#include "scatterwalk.h" - -void *scatterwalk_whichbuf(struct scatter_walk *walk, unsigned int nbytes, void *scratch) -{ - if (nbytes <= walk->len_this_page && - (((unsigned long)walk->data) & (PAGE_CACHE_SIZE - 1)) + nbytes <= - PAGE_CACHE_SIZE) - return walk->data; - else - return scratch; -} - -static void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) -{ - if (out) - memcpy(sgdata, buf, nbytes); - else - memcpy(buf, sgdata, nbytes); -} - -void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg) -{ - unsigned int rest_of_page; - - walk->sg = sg; - - walk->page = sg->page; - walk->len_this_segment = sg->length; - - rest_of_page = PAGE_CACHE_SIZE - (sg->offset & (PAGE_CACHE_SIZE - 1)); - walk->len_this_page = min(sg->length, rest_of_page); - walk->offset = sg->offset; -} - -void scatterwalk_map(struct scatter_walk *walk) -{ - walk->data = kmap_atomic(walk->page) + walk->offset; -} - -static void scatterwalk_pagedone(struct scatter_walk *walk, int out, - unsigned int more) -{ - /* walk->data may be pointing the first byte of the next page; - however, we know we transferred at least one byte. So, - walk->data - 1 will be a virtual address in the mapped page. */ - - if (out) - flush_dcache_page(walk->page); - - if (more) { - walk->len_this_segment -= walk->len_this_page; - - if (walk->len_this_segment) { - walk->page++; - walk->len_this_page = min(walk->len_this_segment, - (unsigned)PAGE_CACHE_SIZE); - walk->offset = 0; - } - else - scatterwalk_start(walk, sg_next(walk->sg)); - } -} - -void scatterwalk_done(struct scatter_walk *walk, int out, int more) -{ - crypto_kunmap(walk->data, out); - if (walk->len_this_page == 0 || !more) - scatterwalk_pagedone(walk, out, more); -} - -/* - * Do not call this unless the total length of all of the fragments - * has been verified as multiple of the block size. - */ -int scatterwalk_copychunks(void *buf, struct scatter_walk *walk, - size_t nbytes) -{ - if (buf != walk->data) { - while (nbytes > walk->len_this_page) { - memcpy_dir(buf, walk->data, walk->len_this_page, out); - buf += walk->len_this_page; - nbytes -= walk->len_this_page; - - kunmap_atomic(walk->data); - scatterwalk_pagedone(walk, out, 1); - scatterwalk_map(walk); - } - - memcpy_dir(buf, walk->data, nbytes, out); - } - - walk->offset += nbytes; - walk->len_this_page -= nbytes; - walk->len_this_segment -= nbytes; - return 0; -} |