ceph: messenger: update "to" in read_partial() caller

read_partial() always increases whatever "to" value is supplied by
adding the requested size to it, and that's the only thing it does
with that pointed-to value.

Do that pointer advance in the caller (and then only when the
updated value will be subsequently used), and change the "to"
parameter to be an in-only and non-pointer value.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 16 insertions, 15 deletions

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 673133ee3181..37fd2aece232 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -992,11 +992,12 @@ static int prepare_read_message(struct ceph_connection *con)
 
 
 static int read_partial(struct ceph_connection *con,
-                        int *to, int size, void *object)
+                        int to, int size, void *object)
 {
-        *to += size;
-        while (con->in_base_pos < *to) {
-                int left = *to - con->in_base_pos;
+        int end = to + size;
+
+        while (con->in_base_pos < end) {
+                int left = end - con->in_base_pos;
                 int have = size - left;
                 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
                 if (ret <= 0)
@@ -1017,14 +1018,16 @@ static int read_partial_banner(struct ceph_connection *con)
         dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
 
         /* peer's banner */
-        ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
+        ret = read_partial(con, to, strlen(CEPH_BANNER), con->in_banner);
         if (ret <= 0)
                 goto out;
-        ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
+        to += strlen(CEPH_BANNER);
+        ret = read_partial(con, to, sizeof(con->actual_peer_addr),
                            &con->actual_peer_addr);
         if (ret <= 0)
                 goto out;
-        ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
+        to += sizeof(con->actual_peer_addr);
+        ret = read_partial(con, to, sizeof(con->peer_addr_for_me),
                            &con->peer_addr_for_me);
         if (ret <= 0)
                 goto out;
@@ -1038,10 +1041,11 @@ static int read_partial_connect(struct ceph_connection *con)
 
         dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
 
-        ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
+        ret = read_partial(con, to, sizeof(con->in_reply), &con->in_reply);
         if (ret <= 0)
                 goto out;
-        ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
+        to += sizeof(con->in_reply);
+        ret = read_partial(con, to, le32_to_cpu(con->in_reply.authorizer_len),
                            con->auth_reply_buf);
         if (ret <= 0)
                 goto out;
@@ -1491,9 +1495,7 @@ static int process_connect(struct ceph_connection *con)
  */
 static int read_partial_ack(struct ceph_connection *con)
 {
-        int to = 0;
-
-        return read_partial(con, &to, sizeof(con->in_temp_ack),
+        return read_partial(con, 0, sizeof(con->in_temp_ack),
                             &con->in_temp_ack);
 }
 
@@ -1638,8 +1640,7 @@ static int read_partial_message(struct ceph_connection *con)
         dout("read_partial_message con %p msg %p\n", con, m);
 
         /* header */
-        to = 0;
-        ret = read_partial(con, &to, sizeof (con->in_hdr), &con->in_hdr);
+        ret = read_partial(con, 0, sizeof (con->in_hdr), &con->in_hdr);
         if (ret <= 0)
                 return ret;
 
@@ -1755,7 +1756,7 @@ static int read_partial_message(struct ceph_connection *con)
 
         /* footer */
         to = sizeof (m->hdr);
-        ret = read_partial(con, &to, sizeof (m->footer), &m->footer);
+        ret = read_partial(con, to, sizeof (m->footer), &m->footer);
         if (ret <= 0)
                 return ret;