infiniband: shut up a maybe-uninitialized warning

Some configurations produce this harmless warning when built with gcc
-Wmaybe-uninitialized:

  infiniband/core/cma.c: In function 'cma_get_net_dev':
  infiniband/core/cma.c:1242:12: warning: 'src_addr_storage.sin_addr.s_addr' may be used uninitialized in this function [-Wmaybe-uninitialized]

I previously reported this for the powerpc64 defconfig, but have now
reproduced the same thing for x86 as well, using gcc-5 or higher.

The code looks correct to me, and this change just rearranges it by
making sure we alway initialize the entire address structure to make the
warning disappear.  My first approach added an initialization at the
time of the declaration, which Doug commented may be too costly, so I
hope this version doesn't add overhead.

Link: http://arm-soc.lixom.net/buildlogs/mainline/v4.7-rc6/buildall.powerpc.ppc64_defconfig.log.passed
Link: https://patchwork.kernel.org/patch/9212825/
Acked-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 36bf50ebb187eb40195f0ede0d2d3abcc47d8ccb..89a6b05468045cbca835573fd450d4e4466f75d7 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1094,47 +1094,47 @@ static void cma_save_ib_info(struct sockaddr *src_addr,
        }
 }
 
-static void cma_save_ip4_info(struct sockaddr *src_addr,
-                             struct sockaddr *dst_addr,
+static void cma_save_ip4_info(struct sockaddr_in *src_addr,
+                             struct sockaddr_in *dst_addr,
                              struct cma_hdr *hdr,
                              __be16 local_port)
 {
-       struct sockaddr_in *ip4;
-
        if (src_addr) {
-               ip4 = (struct sockaddr_in *)src_addr;
-               ip4->sin_family = AF_INET;
-               ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
-               ip4->sin_port = local_port;
+               *src_addr = (struct sockaddr_in) {
+                       .sin_family = AF_INET,
+                       .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
+                       .sin_port = local_port,
+               };
        }
 
        if (dst_addr) {
-               ip4 = (struct sockaddr_in *)dst_addr;
-               ip4->sin_family = AF_INET;
-               ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
-               ip4->sin_port = hdr->port;
+               *dst_addr = (struct sockaddr_in) {
+                       .sin_family = AF_INET,
+                       .sin_addr.s_addr = hdr->src_addr.ip4.addr,
+                       .sin_port = hdr->port,
+               };
        }
 }
 
-static void cma_save_ip6_info(struct sockaddr *src_addr,
-                             struct sockaddr *dst_addr,
+static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
+                             struct sockaddr_in6 *dst_addr,
                              struct cma_hdr *hdr,
                              __be16 local_port)
 {
-       struct sockaddr_in6 *ip6;
-
        if (src_addr) {
-               ip6 = (struct sockaddr_in6 *)src_addr;
-               ip6->sin6_family = AF_INET6;
-               ip6->sin6_addr = hdr->dst_addr.ip6;
-               ip6->sin6_port = local_port;
+               *src_addr = (struct sockaddr_in6) {
+                       .sin6_family = AF_INET6,
+                       .sin6_addr = hdr->dst_addr.ip6,
+                       .sin6_port = local_port,
+               };
        }
 
        if (dst_addr) {
-               ip6 = (struct sockaddr_in6 *)dst_addr;
-               ip6->sin6_family = AF_INET6;
-               ip6->sin6_addr = hdr->src_addr.ip6;
-               ip6->sin6_port = hdr->port;
+               *dst_addr = (struct sockaddr_in6) {
+                       .sin6_family = AF_INET6,
+                       .sin6_addr = hdr->src_addr.ip6,
+                       .sin6_port = hdr->port,
+               };
        }
 }
 
@@ -1159,10 +1159,12 @@ static int cma_save_ip_info(struct sockaddr *src_addr,
 
        switch (cma_get_ip_ver(hdr)) {
        case 4:
-               cma_save_ip4_info(src_addr, dst_addr, hdr, port);
+               cma_save_ip4_info((struct sockaddr_in *)src_addr,
+                                 (struct sockaddr_in *)dst_addr, hdr, port);
                break;
        case 6:
-               cma_save_ip6_info(src_addr, dst_addr, hdr, port);
+               cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
+                                 (struct sockaddr_in6 *)dst_addr, hdr, port);
                break;
        default:
                return -EAFNOSUPPORT;