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smc: fix sendpage() call

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[ Upstream commit bda27ff5c4526f80a7620a94ecfe8dca153e3696 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Raspl 2018-05-03 17:57:39 +02:00 committed by Greg Kroah-Hartman
parent 9c0f528f6b
commit 194feed06b
1 changed files with 4 additions and 2 deletions
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6
net/smc/af_smc.c
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@ -1264,8 +1264,11 @@ 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);
@ -1273,7 +1276,6 @@ 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;
}