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staging/fwserial: Only reset port status for attached peers 

When a port has been reserved in an attempt to connect to a peer
but that attempt does not succeed, releasing the port should not
reset the port line status. Although resetting is functionally
harmless, it can appear as if a remote peer dropped carrier to a
port it was not attached to (which can be confusing).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-01-28 22:34:35 -05:00 committed by Greg Kroah-Hartman
parent 2b86216ba1
commit de321a14da
1 changed files with 12 additions and 9 deletions
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21
drivers/staging/fwserial/fwserial.c
View File

@ -1783,10 +1783,11 @@ static struct fwtty_port *fwserial_find_port(struct fwtty_peer *peer)
return NULL;
}
static void fwserial_release_port(struct fwtty_port *port)
static void fwserial_release_port(struct fwtty_port *port, bool reset)
{
/* drop carrier (and all other line status) */
fwtty_update_port_status(port, 0);
if (reset)
fwtty_update_port_status(port, 0);
spin_lock_bh(&port->lock);
@ -1816,7 +1817,7 @@ static void fwserial_plug_timeout(unsigned long data)
spin_unlock_bh(&peer->lock);
if (port)
fwserial_release_port(port);
fwserial_release_port(port, false);
}
/**
@ -1879,7 +1880,7 @@ static int fwserial_connect_peer(struct fwtty_peer *peer)
peer_revert_state(peer);
release_port:
spin_unlock_bh(&peer->lock);
fwserial_release_port(port);
fwserial_release_port(port, false);
free_pkt:
kfree(pkt);
return err;
@ -2157,7 +2158,7 @@ static void fwserial_remove_peer(struct fwtty_peer *peer)
spin_unlock_bh(&peer->lock);
if (port)
fwserial_release_port(port);
fwserial_release_port(port, true);
synchronize_rcu();
kfree(peer);
@ -2617,7 +2618,7 @@ static void fwserial_handle_plug_req(struct work_struct *work)
spin_unlock_bh(&peer->lock);
if (port)
fwserial_release_port(port);
fwserial_release_port(port, false);
rcode = fwserial_send_mgmt_sync(peer, pkt);
@ -2639,7 +2640,7 @@ static void fwserial_handle_plug_req(struct work_struct *work)
cleanup:
spin_unlock_bh(&peer->lock);
if (port)
fwserial_release_port(port);
fwserial_release_port(port, false);
kfree(pkt);
return;
}
@ -2691,7 +2692,7 @@ static void fwserial_handle_unplug_req(struct work_struct *work)
cleanup:
spin_unlock_bh(&peer->lock);
if (port)
fwserial_release_port(port);
fwserial_release_port(port, true);
kfree(pkt);
return;
}
@ -2702,6 +2703,7 @@ static int fwserial_parse_mgmt_write(struct fwtty_peer *peer,
size_t len)
{
struct fwtty_port *port = NULL;
bool reset = false;
int rcode;
if (addr != fwserial_mgmt_addr_handler.offset || len < sizeof(pkt->hdr))
@ -2777,6 +2779,7 @@ static int fwserial_parse_mgmt_write(struct fwtty_peer *peer,
if (be16_to_cpu(pkt->hdr.code) & FWSC_RSP_NACK)
fwtty_notice(&peer->unit, "NACK unplug?");
port = peer_revert_state(peer);
reset = true;
}
break;
@ -2788,7 +2791,7 @@ static int fwserial_parse_mgmt_write(struct fwtty_peer *peer,
spin_unlock_bh(&peer->lock);
if (port)
fwserial_release_port(port);
fwserial_release_port(port, reset);
return rcode;
}