dm crypt: remove obsolete references to per-CPU state

dm-crypt used to use separate crypto transforms for each CPU, but this
is no longer the case.  To avoid confusion, fix up obsolete comments and
rename setup_essiv_cpu().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 64c5022449ee44ebd7b80ee2bac235ae4c298ed0..e2de5715d528c19bde3f589fea2a16dc62a6e921 100644 (file)
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -225,7 +225,7 @@ static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
                                             struct scatterlist *sg);
 
 /*
- * Use this to access cipher attributes that are the same for each CPU.
+ * Use this to access cipher attributes that are independent of the key.
  */
 static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
 {
@@ -349,10 +349,11 @@ static int crypt_iv_essiv_wipe(struct crypt_config *cc)
        return err;
 }
 
-/* Set up per cpu cipher state */
-static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc,
-                                            struct dm_target *ti,
-                                            u8 *salt, unsigned saltsize)
+/* Allocate the cipher for ESSIV */
+static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc,
+                                               struct dm_target *ti,
+                                               const u8 *salt,
+                                               unsigned int saltsize)
 {
        struct crypto_cipher *essiv_tfm;
        int err;
@@ -431,9 +432,8 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
        cc->iv_gen_private.essiv.salt = salt;
        cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
 
-       essiv_tfm = setup_essiv_cpu(cc, ti, salt,
-                               crypto_ahash_digestsize(hash_tfm));
-
+       essiv_tfm = alloc_essiv_cipher(cc, ti, salt,
+                                      crypto_ahash_digestsize(hash_tfm));
        if (IS_ERR(essiv_tfm)) {
                crypt_iv_essiv_dtr(cc);
                return PTR_ERR(essiv_tfm);