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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-08-12 22:11:49 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2017-08-16 22:10:16 +0300
commit8d6f97d698b2b9e71124ba95688a6bf1adad5055 (patch)
treebe327d7f519f65e32e7d4472a33942d9553fb83a /net/sunrpc/xprtsock.c
parentc89091c88db768e3d28992023ca2cff6636c402b (diff)
downloadlinux-8d6f97d698b2b9e71124ba95688a6bf1adad5055.tar.xz
SUNRPC: Don't loop forever in xs_tcp_data_receive()
Ensure that we don't hog the workqueue thread by requeuing the job every 64 loops. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'net/sunrpc/xprtsock.c')
-rw-r--r--net/sunrpc/xprtsock.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index a2312f14beb4..e8f44fc76754 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1526,6 +1526,7 @@ static void xs_tcp_data_receive(struct sock_xprt *transport)
.arg.data = xprt,
};
unsigned long total = 0;
+ int loop;
int read = 0;
mutex_lock(&transport->recv_mutex);
@@ -1534,20 +1535,20 @@ static void xs_tcp_data_receive(struct sock_xprt *transport)
goto out;
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
- for (;;) {
+ for (loop = 0; loop < 64; loop++) {
lock_sock(sk);
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
if (read <= 0) {
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
release_sock(sk);
- if (!test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
- break;
- } else {
- release_sock(sk);
- total += read;
+ break;
}
+ release_sock(sk);
+ total += read;
rd_desc.count = 65536;
}
+ if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
+ queue_work(xprtiod_workqueue, &transport->recv_worker);
out:
mutex_unlock(&transport->recv_mutex);
trace_xs_tcp_data_ready(xprt, read, total);