From b0a9aa6da8088b722326a858ab572a13b5b6f9cb Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 26 May 2014 19:23:32 +0200 Subject: [PATCH] USB: usb_wwan: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/usb-wwan.h | 1 - drivers/usb/serial/usb_wwan.c | 11 +++++++---- 2 files changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/usb/serial/usb-wwan.h b/drivers/usb/serial/usb-wwan.h index 8502f9add334..f22dff58b587 100644 --- a/drivers/usb/serial/usb-wwan.h +++ b/drivers/usb/serial/usb-wwan.h @@ -48,7 +48,6 @@ struct usb_wwan_port_private { struct urb *out_urbs[N_OUT_URB]; u8 *out_buffer[N_OUT_URB]; unsigned long out_busy; /* Bit vector of URBs in use */ - int opened; struct usb_anchor delayed; /* Settings for the port */ diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c index bbcbdaa16c17..2932d9cfb166 100644 --- a/drivers/usb/serial/usb_wwan.c +++ b/drivers/usb/serial/usb_wwan.c @@ -395,7 +395,6 @@ int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port) } 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); @@ -429,8 +428,11 @@ void usb_wwan_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); @@ -645,11 +647,12 @@ int usb_wwan_resume(struct usb_serial *serial) 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; + portdata = usb_get_serial_port_data(port); + if (port->interrupt_in_urb) { err = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); -- 2.20.1