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authorJohan Hovold <jhovold@gmail.com>2014-05-26 19:23:09 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-27 15:04:05 -0700
commitc2e45d704723723e5691c7b4bcd0ff4aeb813522 (patch)
tree8b6a04df0e6cb961036fae3ddfcf07d7696e8f52 /drivers/usb/serial/sierra.c
parent0287d5c5cda82ebe87e79e5a298f40f0ca05e5ef (diff)
downloadlinux-stericsson-c2e45d704723723e5691c7b4bcd0ff4aeb813522.tar.gz
USB: sierra: do not resume I/O on closing ports
Use tty-port initialised flag rather than private flag to determine when port is closing down. Since the tty-port flag is set prior to dropping DTR/RTS (when HUPCL is set) this avoid submitting the read urbs when resuming the interface in dtr_rts() only to immediately kill them again in shutdown(). Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial/sierra.c')
-rw-r--r--drivers/usb/serial/sierra.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index be4a759b3aed..6f7f01eb556a 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -316,7 +316,6 @@ struct sierra_port_private {
int dsr_state;
int dcd_state;
int ri_state;
- unsigned int opened:1;
};
static int sierra_send_setup(struct usb_serial_port *port)
@@ -769,8 +768,11 @@ static void sierra_close(struct usb_serial_port *port)
portdata = usb_get_serial_port_data(port);
+ /*
+ * Need to take susp_lock to make sure port is not already being
+ * resumed, but no need to hold it due to ASYNC_INITIALIZED.
+ */
spin_lock_irq(&intfdata->susp_lock);
- portdata->opened = 0;
if (--intfdata->open_ports == 0)
serial->interface->needs_remote_wakeup = 0;
spin_unlock_irq(&intfdata->susp_lock);
@@ -826,7 +828,6 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
goto err_submit;
spin_lock_irq(&intfdata->susp_lock);
- portdata->opened = 1;
if (++intfdata->open_ports == 1)
serial->interface->needs_remote_wakeup = 1;
spin_unlock_irq(&intfdata->susp_lock);
@@ -1025,16 +1026,14 @@ static int sierra_resume(struct usb_serial *serial)
{
struct usb_serial_port *port;
struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
- struct sierra_port_private *portdata;
int ec = 0;
int i, err;
spin_lock_irq(&intfdata->susp_lock);
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
- portdata = usb_get_serial_port_data(port);
- if (!portdata || !portdata->opened)
+ if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
continue;
err = sierra_submit_delayed_urbs(port);