smc: fix sendpage() call

The sendpage() call grabs the sock lock before calling the default
implementation - which tries to grab it once again.

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com><
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index d03b8d29ffc0..544bab42f925 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1315,8 +1315,11 @@ static ssize_t smc_sendpage(struct socket *sock, struct page *page,
 
         smc = smc_sk(sk);
         lock_sock(sk);
-        if (sk->sk_state != SMC_ACTIVE)
+        if (sk->sk_state != SMC_ACTIVE) {
+                release_sock(sk);
                 goto out;
+        }
+        release_sock(sk);
         if (smc->use_fallback)
                 rc = kernel_sendpage(smc->clcsock, page, offset,
                                      size, flags);
@@ -1324,7 +1327,6 @@ static ssize_t smc_sendpage(struct socket *sock, struct page *page,
                 rc = sock_no_sendpage(sock, page, offset, size, flags);
 
 out:
-        release_sock(sk);
         return rc;
 }