[SCSI] iscsi_tcp: enable sg chaining

[linux.git] / crypto / digest.c

diff --git a/crypto/digest.c b/crypto/digest.c
index 8f4593268ce0bf5c5ef2e9e47d8ab72789adb842..8871dec8cae7484a1fe34e68966563ad1d6032b9 100644 (file)
--- a/crypto/digest.c
+++ b/crypto/digest.c
@@ -14,7 +14,9 @@
 
 #include <linux/mm.h>
 #include <linux/errno.h>
+#include <linux/hardirq.h>
 #include <linux/highmem.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/scatterlist.h>
 
@@ -29,8 +31,8 @@ static int init(struct hash_desc *desc)
        return 0;
 }
 
-static int update(struct hash_desc *desc,
-                 struct scatterlist *sg, unsigned int nbytes)
+static int update2(struct hash_desc *desc,
+                  struct scatterlist *sg, unsigned int nbytes)
 {
        struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
        unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
@@ -39,7 +41,7 @@ static int update(struct hash_desc *desc,
                return 0;
 
        for (;;) {
-               struct page *pg = sg->page;
+               struct page *pg = sg_page(sg);
                unsigned int offset = sg->offset;
                unsigned int l = sg->length;
 
@@ -75,12 +77,20 @@ static int update(struct hash_desc *desc,
 
                if (!nbytes)
                        break;
-               sg = sg_next(sg);
+               sg = scatterwalk_sg_next(sg);
        }
 
        return 0;
 }
 
+static int update(struct hash_desc *desc,
+                 struct scatterlist *sg, unsigned int nbytes)
+{
+       if (WARN_ON_ONCE(in_irq()))
+               return -EDEADLK;
+       return update2(desc, sg, nbytes);
+}
+
 static int final(struct hash_desc *desc, u8 *out)
 {
        struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
@@ -118,16 +128,14 @@ static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
 static int digest(struct hash_desc *desc,
                  struct scatterlist *sg, unsigned int nbytes, u8 *out)
 {
+       if (WARN_ON_ONCE(in_irq()))
+               return -EDEADLK;
+
        init(desc);
-       update(desc, sg, nbytes);
+       update2(desc, sg, nbytes);
        return final(desc, out);
 }
 
-int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
-{
-       return flags ? -EINVAL : 0;
-}
-
 int crypto_init_digest_ops(struct crypto_tfm *tfm)
 {
        struct hash_tfm *ops = &tfm->crt_hash;