crypto: caam - incapsulate dropping leading zeros into function

This function will be used into further patches.

Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index 999ba18..d2c6977 100644 (file)
--- a/drivers/crypto/caam/caampkc.c
+++ b/drivers/crypto/caam/caampkc.c
@@ -357,6 +357,14 @@ static void caam_rsa_free_key(struct caam_rsa_key *key)
        key->n_sz = 0;
 }
 
+static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
+{
+       while (!**ptr && *nbytes) {
+               (*ptr)++;
+               (*nbytes)--;
+       }
+}
+
 /**
  * caam_read_raw_data - Read a raw byte stream as a positive integer.
  * The function skips buffer's leading zeros, copies the remained data
@@ -370,10 +378,7 @@ static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 {
        u8 *val;
 
-       while (!*buf && *nbytes) {
-               buf++;
-               (*nbytes)--;
-       }
+       caam_rsa_drop_leading_zeros(&buf, nbytes);
        if (!*nbytes)
                return NULL;