[3/5] crypto: caampkc - incapsulate dropping leading zeros into function

Commit Message

Horia Geanta April 25, 2017, 1:26 p.m. UTC

From: Radu Alexe <[e-mail]>

This function will be used into further patches.

Signed-off-by: Radu Alexe <[e-mail]>
Signed-off-by: Horia Geantă <[e-mail]>
---
 drivers/crypto/caam/caampkc.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

Patch

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index 999ba18495b0..d2c6977ba82e 100644
--- 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;