[PATCH] Use sg_set_buf/sg_init_one where applicable

This patch uses sg_set_buf/sg_init_one in some places where it was
duplicated.

Signed-off-by: David Hardeman <david@2gen.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Greg KH <greg@kroah.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

10 files changed, 44 insertions, 105 deletions

diff --git a/crypto/hmac.c b/crypto/hmac.c
index da0456b37109..46120dee5ada 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -18,18 +18,15 @@
 #include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/slab.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #include "internal.h"
 
 static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
 {
         struct scatterlist tmp;
         
-        tmp.page = virt_to_page(key);
-        tmp.offset = offset_in_page(key);
-        tmp.length = keylen;
+        sg_set_buf(&tmp, key, keylen);
         crypto_digest_digest(tfm, &tmp, 1, key);
-                
 }
 
 int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
@@ -69,9 +66,7 @@ void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen)
         for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
                 ipad[i] ^= 0x36;
 
-        tmp.page = virt_to_page(ipad);
-        tmp.offset = offset_in_page(ipad);
-        tmp.length = crypto_tfm_alg_blocksize(tfm);
+        sg_set_buf(&tmp, ipad, crypto_tfm_alg_blocksize(tfm));
         
         crypto_digest_init(tfm);
         crypto_digest_update(tfm, &tmp, 1);
@@ -103,16 +98,12 @@ void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
         for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
                 opad[i] ^= 0x5c;
 
-        tmp.page = virt_to_page(opad);
-        tmp.offset = offset_in_page(opad);
-        tmp.length = crypto_tfm_alg_blocksize(tfm);
+        sg_set_buf(&tmp, opad, crypto_tfm_alg_blocksize(tfm));
 
         crypto_digest_init(tfm);
         crypto_digest_update(tfm, &tmp, 1);
         
-        tmp.page = virt_to_page(out);
-        tmp.offset = offset_in_page(out);
-        tmp.length = crypto_tfm_alg_digestsize(tfm);
+        sg_set_buf(&tmp, out, crypto_tfm_alg_digestsize(tfm));
         
         crypto_digest_update(tfm, &tmp, 1);
         crypto_digest_final(tfm, out);
diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index 68639419c5bd..577a3aff3113 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -21,7 +21,7 @@
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #include <linux/string.h>
 #include <linux/crypto.h>
 #include <linux/highmem.h>
@@ -86,7 +86,6 @@ static void hexdump(unsigned char *buf, unsigned int len)
 static void test_hash(char *algo, struct hash_testvec *template,
                       unsigned int tcount)
 {
-        char *p;
         unsigned int i, j, k, temp;
         struct scatterlist sg[8];
         char result[64];
@@ -116,10 +115,7 @@ static void test_hash(char *algo, struct hash_testvec *template,
                 printk("test %u:\n", i + 1);
                 memset(result, 0, 64);
 
-                p = hash_tv[i].plaintext;
-                sg[0].page = virt_to_page(p);
-                sg[0].offset = offset_in_page(p);
-                sg[0].length = hash_tv[i].psize;
+                sg_set_buf(&sg[0], hash_tv[i].plaintext, hash_tv[i].psize);
 
                 crypto_digest_init(tfm);
                 if (tfm->crt_u.digest.dit_setkey) {
@@ -154,10 +150,8 @@ static void test_hash(char *algo, struct hash_testvec *template,
                                        hash_tv[i].plaintext + temp,
                                        hash_tv[i].tap[k]);
                                 temp += hash_tv[i].tap[k];
-                                p = &xbuf[IDX[k]];
-                                sg[k].page = virt_to_page(p);
-                                sg[k].offset = offset_in_page(p);
-                                sg[k].length = hash_tv[i].tap[k];
+                                sg_set_buf(&sg[k], &xbuf[IDX[k]],
+                                            hash_tv[i].tap[k]);
                         }
 
                         crypto_digest_digest(tfm, sg, hash_tv[i].np, result);
@@ -179,7 +173,6 @@ static void test_hash(char *algo, struct hash_testvec *template,
 static void test_hmac(char *algo, struct hmac_testvec *template,
                       unsigned int tcount)
 {
-        char *p;
         unsigned int i, j, k, temp;
         struct scatterlist sg[8];
         char result[64];
@@ -210,11 +203,8 @@ static void test_hmac(char *algo, struct hmac_testvec *template,
                 printk("test %u:\n", i + 1);
                 memset(result, 0, sizeof (result));
 
-                p = hmac_tv[i].plaintext;
                 klen = hmac_tv[i].ksize;
-                sg[0].page = virt_to_page(p);
-                sg[0].offset = offset_in_page(p);
-                sg[0].length = hmac_tv[i].psize;
+                sg_set_buf(&sg[0], hmac_tv[i].plaintext, hmac_tv[i].psize);
 
                 crypto_hmac(tfm, hmac_tv[i].key, &klen, sg, 1, result);
 
@@ -243,10 +233,8 @@ static void test_hmac(char *algo, struct hmac_testvec *template,
                                        hmac_tv[i].plaintext + temp,
                                        hmac_tv[i].tap[k]);
                                 temp += hmac_tv[i].tap[k];
-                                p = &xbuf[IDX[k]];
-                                sg[k].page = virt_to_page(p);
-                                sg[k].offset = offset_in_page(p);
-                                sg[k].length = hmac_tv[i].tap[k];
+                                sg_set_buf(&sg[k], &xbuf[IDX[k]],
+                                            hmac_tv[i].tap[k]);
                         }
 
                         crypto_hmac(tfm, hmac_tv[i].key, &klen, sg,
@@ -270,7 +258,7 @@ static void test_cipher(char *algo, int mode, int enc,
 {
         unsigned int ret, i, j, k, temp;
         unsigned int tsize;
-        char *p, *q;
+        char *q;
         struct crypto_tfm *tfm;
         char *key;
         struct cipher_testvec *cipher_tv;
@@ -330,10 +318,8 @@ static void test_cipher(char *algo, int mode, int enc,
                                         goto out;
                         }
 
-                        p = cipher_tv[i].input;
-                        sg[0].page = virt_to_page(p);
-                        sg[0].offset = offset_in_page(p);
-                        sg[0].length = cipher_tv[i].ilen;
+                        sg_set_buf(&sg[0], cipher_tv[i].input,
+                                   cipher_tv[i].ilen);
 
                         if (!mode) {
                                 crypto_cipher_set_iv(tfm, cipher_tv[i].iv,
@@ -389,10 +375,8 @@ static void test_cipher(char *algo, int mode, int enc,
                                        cipher_tv[i].input + temp,
                                        cipher_tv[i].tap[k]);
                                 temp += cipher_tv[i].tap[k];
-                                p = &xbuf[IDX[k]];
-                                sg[k].page = virt_to_page(p);
-                                sg[k].offset = offset_in_page(p);
-                                sg[k].length = cipher_tv[i].tap[k];
+                                sg_set_buf(&sg[k], &xbuf[IDX[k]],
+                                           cipher_tv[i].tap[k]);
                         }
 
                         if (!mode) {
@@ -436,9 +420,7 @@ static int test_cipher_jiffies(struct crypto_tfm *tfm, int enc, char *p,
         int bcount;
         int ret;
 
-        sg[0].page = virt_to_page(p);
-        sg[0].offset = offset_in_page(p);
-        sg[0].length = blen;
+        sg_set_buf(&sg[0], p, blen);
 
         for (start = jiffies, end = start + sec * HZ, bcount = 0;
              time_before(jiffies, end); bcount++) {
@@ -464,9 +446,7 @@ static int test_cipher_cycles(struct crypto_tfm *tfm, int enc, char *p,
         int ret = 0;
         int i;
 
-        sg[0].page = virt_to_page(p);
-        sg[0].offset = offset_in_page(p);
-        sg[0].length = blen;
+        sg_set_buf(&sg[0], p, blen);
 
         local_bh_disable();
         local_irq_disable();
@@ -709,9 +689,7 @@ static void test_crc32c(void)
         for (i = 0; i < NUMVEC; i++) {
                 for (j = 0; j < VECSIZE; j++)
                         test_vec[i][j] = ++b;
-                sg[i].page = virt_to_page(test_vec[i]);
-                sg[i].offset = offset_in_page(test_vec[i]);
-                sg[i].length = VECSIZE;
+                sg_set_buf(&sg[i], test_vec[i], VECSIZE);
         }
 
         seed = SEEDTESTVAL;
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 28c1a628621f..cf6631056683 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -15,7 +15,7 @@
 #include <linux/crypto.h>
 #include <linux/workqueue.h>
 #include <asm/atomic.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #include <asm/page.h>
 
 #include "dm.h"
@@ -164,9 +164,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
                 return -ENOMEM;
         }
 
-        sg.page = virt_to_page(cc->key);
-        sg.offset = offset_in_page(cc->key);
-        sg.length = cc->key_size;
+        sg_set_buf(&sg, cc->key, cc->key_size);
         crypto_digest_digest(hash_tfm, &sg, 1, salt);
         crypto_free_tfm(hash_tfm);
 
@@ -207,14 +205,12 @@ static void crypt_iv_essiv_dtr(struct crypt_config *cc)
 
 static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
 {
-        struct scatterlist sg = { NULL, };
+        struct scatterlist sg;
 
         memset(iv, 0, cc->iv_size);
         *(u64 *)iv = cpu_to_le64(sector);
 
-        sg.page = virt_to_page(iv);
-        sg.offset = offset_in_page(iv);
-        sg.length = cc->iv_size;
+        sg_set_buf(&sg, iv, cc->iv_size);
         crypto_cipher_encrypt((struct crypto_tfm *)cc->iv_gen_private,
                               &sg, &sg, cc->iv_size);
 
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 4c11699bad91..1609ce11389d 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -35,6 +35,7 @@
 #include <linux/interrupt.h>
 #include <linux/in.h>
 #include <linux/bitops.h>
+#include <linux/scatterlist.h>
 #include <asm/io.h>
 #include <asm/system.h>
 
@@ -1590,9 +1591,7 @@ static void emmh32_setseed(emmh32_context *context, u8 *pkey, int keylen, struct
                 aes_counter[12] = (u8)(counter >> 24);
                 counter++;
                 memcpy (plain, aes_counter, 16);
-                sg[0].page = virt_to_page(plain);
-                sg[0].offset = ((long) plain & ~PAGE_MASK);
-                sg[0].length = 16;
+                sg_set_buf(&sg[0], plain, 16);
                 crypto_cipher_encrypt(tfm, sg, sg, 16);
                 cipher = kmap(sg[0].page) + sg[0].offset;
                 for (j=0; (j<16) && (i< (sizeof(context->coeff)/sizeof(context->coeff[0]))); ) {
diff --git a/drivers/scsi/arm/scsi.h b/drivers/scsi/arm/scsi.h
index 48e1c4d9738b..19937640e2e7 100644
--- a/drivers/scsi/arm/scsi.h
+++ b/drivers/scsi/arm/scsi.h
@@ -10,6 +10,8 @@
  *  Commonly used scsi driver functions.
  */
 
+#include <linux/scatterlist.h>
+
 #define BELT_AND_BRACES
 
 /*
@@ -22,9 +24,7 @@ static inline int copy_SCp_to_sg(struct scatterlist *sg, Scsi_Pointer *SCp, int
 
         BUG_ON(bufs + 1 > max);
 
-        sg->page   = virt_to_page(SCp->ptr);
-        sg->offset = offset_in_page(SCp->ptr);
-        sg->length = SCp->this_residual;
+        sg_set_buf(sg, SCp->ptr, SCp->this_residual);
 
         if (bufs)
                 memcpy(sg + 1, SCp->buffer + 1,
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index b1b1c6f01419..5ca97605ff35 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -49,6 +49,7 @@
 #include <linux/suspend.h>
 #include <linux/workqueue.h>
 #include <linux/jiffies.h>
+#include <linux/scatterlist.h>
 #include <scsi/scsi.h>
 #include "scsi.h"
 #include "scsi_priv.h"
@@ -2576,19 +2577,12 @@ void ata_qc_prep(struct ata_queued_cmd *qc)
 
 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
 {
-        struct scatterlist *sg;
-
         qc->flags |= ATA_QCFLAG_SINGLE;
 
-        memset(&qc->sgent, 0, sizeof(qc->sgent));
         qc->sg = &qc->sgent;
         qc->n_elem = 1;
         qc->buf_virt = buf;
-
-        sg = qc->sg;
-        sg->page = virt_to_page(buf);
-        sg->offset = (unsigned long) buf & ~PAGE_MASK;
-        sg->length = buflen;
+        sg_init_one(qc->sg, buf, buflen);
 }
 
 /**
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 861e51375d70..07fee811c09e 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -49,6 +49,7 @@ static int sg_version_num = 30533;	/* 2 digits for each component */
 #include <linux/seq_file.h>
 #include <linux/blkdev.h>
 #include <linux/delay.h>
+#include <linux/scatterlist.h>
 
 #include "scsi.h"
 #include <scsi/scsi_dbg.h>
@@ -1992,9 +1993,7 @@ sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
                                 if (!p)
                                         break;
                         }
-                        sclp->page = virt_to_page(p);
-                        sclp->offset = offset_in_page(p);
-                        sclp->length = ret_sz;
+                        sg_set_buf(sclp, p, ret_sz);
 
                         SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
                                           k, sg_scatg2virt(sclp), ret_sz));
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 90a96257d6ce..2997f558159b 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -9,7 +9,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 
 #include <linux/usb.h>
 
@@ -381,7 +381,6 @@ alloc_sglist (int nents, int max, int vary)
         sg = kmalloc (nents * sizeof *sg, SLAB_KERNEL);
         if (!sg)
                 return NULL;
-        memset (sg, 0, nents * sizeof *sg);
 
         for (i = 0; i < nents; i++) {
                 char            *buf;
@@ -394,9 +393,7 @@ alloc_sglist (int nents, int max, int vary)
                 memset (buf, 0, size);
 
                 /* kmalloc pages are always physically contiguous! */
-                sg [i].page = virt_to_page (buf);
-                sg [i].offset = offset_in_page (buf);
-                sg [i].length = size;
+                sg_init_one(&sg[i], buf, size);
 
                 if (vary) {
                         size += vary;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a970b4727ce8..41edc14851e8 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -75,7 +75,7 @@
 #ifdef CONFIG_IPV6_PRIVACY
 #include <linux/random.h>
 #include <linux/crypto.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #endif
 
 #include <asm/uaccess.h>
@@ -1217,12 +1217,8 @@ static int __ipv6_regen_rndid(struct inet6_dev *idev)
         struct net_device *dev;
         struct scatterlist sg[2];
 
-        sg[0].page = virt_to_page(idev->entropy);
-        sg[0].offset = offset_in_page(idev->entropy);
-        sg[0].length = 8;
-        sg[1].page = virt_to_page(idev->work_eui64);
-        sg[1].offset = offset_in_page(idev->work_eui64);
-        sg[1].length = 8;
+        sg_set_buf(&sg[0], idev->entropy, 8);
+        sg_set_buf(&sg[1], idev->work_eui64, 8);
 
         dev = idev->dev;
 
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index 3f3d5437f02d..e65e1f979275 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -37,7 +37,7 @@
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #include <linux/crypto.h>
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
@@ -75,9 +75,7 @@ krb5_encrypt(
                 memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm));
 
         memcpy(out, in, length);
-        sg[0].page = virt_to_page(out);
-        sg[0].offset = offset_in_page(out);
-        sg[0].length = length;
+        sg_set_buf(&sg[0], out, length);
 
         ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv);
 
@@ -117,9 +115,7 @@ krb5_decrypt(
                 memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm));
 
         memcpy(out, in, length);
-        sg[0].page = virt_to_page(out);
-        sg[0].offset = offset_in_page(out);
-        sg[0].length = length;
+        sg_set_buf(&sg[0], out, length);
 
         ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv);
 
@@ -132,13 +128,6 @@ out:
 
 EXPORT_SYMBOL(krb5_decrypt);
 
-static void
-buf_to_sg(struct scatterlist *sg, char *ptr, int len) {
-        sg->page = virt_to_page(ptr);
-        sg->offset = offset_in_page(ptr);
-        sg->length = len;
-}
-
 static int
 process_xdr_buf(struct xdr_buf *buf, int offset, int len,
                 int (*actor)(struct scatterlist *, void *), void *data)
@@ -152,7 +141,7 @@ process_xdr_buf(struct xdr_buf *buf, int offset, int len,
                 thislen = buf->head[0].iov_len - offset;
                 if (thislen > len)
                         thislen = len;
-                buf_to_sg(sg, buf->head[0].iov_base + offset, thislen);
+                sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
                 ret = actor(sg, data);
                 if (ret)
                         goto out;
@@ -195,7 +184,7 @@ process_xdr_buf(struct xdr_buf *buf, int offset, int len,
                 thislen = buf->tail[0].iov_len - offset;
                 if (thislen > len)
                         thislen = len;
-                buf_to_sg(sg, buf->tail[0].iov_base + offset, thislen);
+                sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
                 ret = actor(sg, data);
                 len -= thislen;
         }
@@ -241,7 +230,7 @@ make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
                 goto out;
 
         crypto_digest_init(tfm);
-        buf_to_sg(sg, header, hdrlen);
+        sg_set_buf(sg, header, hdrlen);
         crypto_digest_update(tfm, sg, 1);
         process_xdr_buf(body, body_offset, body->len - body_offset,
                         checksummer, tfm);