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author | David Howells <dhowells@redhat.com> | 2016-10-06 08:11:49 +0100 |
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committer | David Howells <dhowells@redhat.com> | 2016-10-06 08:11:49 +0100 |
commit | 26cb02aa6d3efeb543805ed9ad599dae24f7c6d4 (patch) | |
tree | 58265f21e206c1249ed4fbbf6e58bd49258879ef /net/rxrpc/output.c | |
parent | a9f312d98affab387557e2795d4e11ad82a4e4e8 (diff) | |
download | linux-stable-26cb02aa6d3efeb543805ed9ad599dae24f7c6d4.tar.gz linux-stable-26cb02aa6d3efeb543805ed9ad599dae24f7c6d4.tar.bz2 linux-stable-26cb02aa6d3efeb543805ed9ad599dae24f7c6d4.zip |
rxrpc: Fix warning by splitting rxrpc_send_call_packet()
Split rxrpc_send_data_packet() to separate ACK generation (which is more
complicated) from ABORT generation. This simplifies the code a bit and
fixes the following warning:
In file included from ../net/rxrpc/output.c:20:0:
net/rxrpc/output.c: In function 'rxrpc_send_call_packet':
net/rxrpc/ar-internal.h:1187:27: error: 'top' may be used uninitialized in this function [-Werror=maybe-uninitialized]
net/rxrpc/output.c:103:24: note: 'top' was declared here
net/rxrpc/output.c:225:25: error: 'hard_ack' may be used uninitialized in this function [-Werror=maybe-uninitialized]
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/output.c')
-rw-r--r-- | net/rxrpc/output.c | 156 |
1 files changed, 87 insertions, 69 deletions
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c index 0d47db886f6e..2dae877c0876 100644 --- a/net/rxrpc/output.c +++ b/net/rxrpc/output.c @@ -19,24 +19,24 @@ #include <net/af_rxrpc.h> #include "ar-internal.h" -struct rxrpc_pkt_buffer { +struct rxrpc_ack_buffer { struct rxrpc_wire_header whdr; - union { - struct { - struct rxrpc_ackpacket ack; - u8 acks[255]; - u8 pad[3]; - }; - __be32 abort_code; - }; + struct rxrpc_ackpacket ack; + u8 acks[255]; + u8 pad[3]; struct rxrpc_ackinfo ackinfo; }; +struct rxrpc_abort_buffer { + struct rxrpc_wire_header whdr; + __be32 abort_code; +}; + /* * Fill out an ACK packet. */ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call, - struct rxrpc_pkt_buffer *pkt, + struct rxrpc_ack_buffer *pkt, rxrpc_seq_t *_hard_ack, rxrpc_seq_t *_top) { @@ -91,22 +91,19 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call, } /* - * Send an ACK or ABORT call packet. + * Send an ACK call packet. */ -int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) +int rxrpc_send_ack_packet(struct rxrpc_call *call) { struct rxrpc_connection *conn = NULL; - struct rxrpc_pkt_buffer *pkt; + struct rxrpc_ack_buffer *pkt; struct msghdr msg; struct kvec iov[2]; rxrpc_serial_t serial; rxrpc_seq_t hard_ack, top; size_t len, n; bool ping = false; - int ioc, ret; - u32 abort_code; - - _enter("%u,%s", call->debug_id, rxrpc_pkts[type]); + int ret; spin_lock_bh(&call->lock); if (call->conn) @@ -131,65 +128,37 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) pkt->whdr.cid = htonl(call->cid); pkt->whdr.callNumber = htonl(call->call_id); pkt->whdr.seq = 0; - pkt->whdr.type = type; - pkt->whdr.flags = conn->out_clientflag; + pkt->whdr.type = RXRPC_PACKET_TYPE_ACK; + pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag; pkt->whdr.userStatus = 0; pkt->whdr.securityIndex = call->security_ix; pkt->whdr._rsvd = 0; pkt->whdr.serviceId = htons(call->service_id); - iov[0].iov_base = pkt; - iov[0].iov_len = sizeof(pkt->whdr); - len = sizeof(pkt->whdr); - - switch (type) { - case RXRPC_PACKET_TYPE_ACK: - spin_lock_bh(&call->lock); - if (!call->ackr_reason) { - spin_unlock_bh(&call->lock); - ret = 0; - goto out; - } - ping = (call->ackr_reason == RXRPC_ACK_PING); - n = rxrpc_fill_out_ack(call, pkt, &hard_ack, &top); - call->ackr_reason = 0; - + spin_lock_bh(&call->lock); + if (!call->ackr_reason) { spin_unlock_bh(&call->lock); - - - pkt->whdr.flags |= RXRPC_SLOW_START_OK; - - iov[0].iov_len += sizeof(pkt->ack) + n; - iov[1].iov_base = &pkt->ackinfo; - iov[1].iov_len = sizeof(pkt->ackinfo); - len += sizeof(pkt->ack) + n + sizeof(pkt->ackinfo); - ioc = 2; - break; - - case RXRPC_PACKET_TYPE_ABORT: - abort_code = call->abort_code; - pkt->abort_code = htonl(abort_code); - iov[0].iov_len += sizeof(pkt->abort_code); - len += sizeof(pkt->abort_code); - ioc = 1; - break; - - default: - BUG(); - ret = -ENOANO; + ret = 0; goto out; } + ping = (call->ackr_reason == RXRPC_ACK_PING); + n = rxrpc_fill_out_ack(call, pkt, &hard_ack, &top); + call->ackr_reason = 0; + + spin_unlock_bh(&call->lock); + + iov[0].iov_base = pkt; + iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n; + iov[1].iov_base = &pkt->ackinfo; + iov[1].iov_len = sizeof(pkt->ackinfo); + len = iov[0].iov_len + iov[1].iov_len; serial = atomic_inc_return(&conn->serial); pkt->whdr.serial = htonl(serial); - switch (type) { - case RXRPC_PACKET_TYPE_ACK: - trace_rxrpc_tx_ack(call, serial, - ntohl(pkt->ack.firstPacket), - ntohl(pkt->ack.serial), - pkt->ack.reason, pkt->ack.nAcks); - break; - } + trace_rxrpc_tx_ack(call, serial, + ntohl(pkt->ack.firstPacket), + ntohl(pkt->ack.serial), + pkt->ack.reason, pkt->ack.nAcks); if (ping) { call->ackr_ping = serial; @@ -205,13 +174,12 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) set_bit(RXRPC_CALL_PINGING, &call->flags); trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial); } - ret = kernel_sendmsg(conn->params.local->socket, - &msg, iov, ioc, len); + + ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); if (ping) call->ackr_ping_time = ktime_get_real(); - if (type == RXRPC_PACKET_TYPE_ACK && - call->state < RXRPC_CALL_COMPLETE) { + if (call->state < RXRPC_CALL_COMPLETE) { if (ret < 0) { clear_bit(RXRPC_CALL_PINGING, &call->flags); rxrpc_propose_ACK(call, pkt->ack.reason, @@ -236,6 +204,56 @@ out: } /* + * Send an ABORT call packet. + */ +int rxrpc_send_abort_packet(struct rxrpc_call *call) +{ + struct rxrpc_connection *conn = NULL; + struct rxrpc_abort_buffer pkt; + struct msghdr msg; + struct kvec iov[1]; + rxrpc_serial_t serial; + int ret; + + spin_lock_bh(&call->lock); + if (call->conn) + conn = rxrpc_get_connection_maybe(call->conn); + spin_unlock_bh(&call->lock); + if (!conn) + return -ECONNRESET; + + msg.msg_name = &call->peer->srx.transport; + msg.msg_namelen = call->peer->srx.transport_len; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + + pkt.whdr.epoch = htonl(conn->proto.epoch); + pkt.whdr.cid = htonl(call->cid); + pkt.whdr.callNumber = htonl(call->call_id); + pkt.whdr.seq = 0; + pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; + pkt.whdr.flags = conn->out_clientflag; + pkt.whdr.userStatus = 0; + pkt.whdr.securityIndex = call->security_ix; + pkt.whdr._rsvd = 0; + pkt.whdr.serviceId = htons(call->service_id); + pkt.abort_code = htonl(call->abort_code); + + iov[0].iov_base = &pkt; + iov[0].iov_len = sizeof(pkt); + + serial = atomic_inc_return(&conn->serial); + pkt.whdr.serial = htonl(serial); + + ret = kernel_sendmsg(conn->params.local->socket, + &msg, iov, 1, sizeof(pkt)); + + rxrpc_put_connection(conn); + return ret; +} + +/* * send a packet through the transport endpoint */ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb, |