static int acm_ctrl_msg(struct acm *acm, int request, int value,
void *buf, int len)
{
- int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
+ int retval;
+
+ retval = usb_autopm_get_interface(acm->control);
+ if (retval)
+ return retval;
+
+ retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
request, USB_RT_ACM, value,
acm->control->altsetting[0].desc.bInterfaceNumber,
buf, len, 5000);
+
dev_dbg(&acm->control->dev,
"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
__func__, request, value, len, retval);
+
+ usb_autopm_put_interface(acm->control);
+
return retval < 0 ? retval : 0;
}
dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
return;
}
- usb_mark_last_busy(acm->dev);
if (urb->status) {
dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
__func__, urb->status);
return;
}
+
+ usb_mark_last_busy(acm->dev);
+
acm_process_read_urb(acm, urb);
/* throttle device if requested by tty */
spin_lock_irqsave(&acm->read_lock, flags);
acm->throttled = acm->throttle_req;
- if (!acm->throttled && !acm->susp_count) {
+ if (!acm->throttled) {
spin_unlock_irqrestore(&acm->read_lock, flags);
acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
} else {
{
struct acm *acm = container_of(port, struct acm, port);
int retval = -ENODEV;
+ int i;
dev_dbg(&acm->control->dev, "%s\n", __func__);
acm->control->needs_remote_wakeup = 1;
acm->ctrlurb->dev = acm->dev;
- if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
+ retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
+ if (retval) {
dev_err(&acm->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
- usb_autopm_put_interface(acm->control);
goto error_submit_urb;
}
acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
- if (acm_set_control(acm, acm->ctrlout) < 0 &&
- (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
- usb_autopm_put_interface(acm->control);
+ retval = acm_set_control(acm, acm->ctrlout);
+ if (retval < 0 && (acm->ctrl_caps & USB_CDC_CAP_LINE))
goto error_set_control;
- }
-
- usb_autopm_put_interface(acm->control);
/*
* Unthrottle device in case the TTY was closed while throttled.
acm->throttle_req = 0;
spin_unlock_irq(&acm->read_lock);
- if (acm_submit_read_urbs(acm, GFP_KERNEL))
+ retval = acm_submit_read_urbs(acm, GFP_KERNEL);
+ if (retval)
goto error_submit_read_urbs;
+ usb_autopm_put_interface(acm->control);
+
mutex_unlock(&acm->mutex);
return 0;
error_submit_read_urbs:
+ for (i = 0; i < acm->rx_buflimit; i++)
+ usb_kill_urb(acm->read_urbs[i]);
acm->ctrlout = 0;
acm_set_control(acm, acm->ctrlout);
error_set_control:
usb_kill_urb(acm->ctrlurb);
error_submit_urb:
+ usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
mutex_unlock(&acm->mutex);
- return retval;
+
+ return usb_translate_errors(retval);
}
static void acm_port_destruct(struct tty_port *port)
static void acm_port_shutdown(struct tty_port *port)
{
struct acm *acm = container_of(port, struct acm, port);
+ struct urb *urb;
+ struct acm_wb *wb;
int i;
dev_dbg(&acm->control->dev, "%s\n", __func__);
- mutex_lock(&acm->mutex);
- if (!acm->disconnected) {
- usb_autopm_get_interface(acm->control);
- acm_set_control(acm, acm->ctrlout = 0);
- usb_kill_urb(acm->ctrlurb);
- for (i = 0; i < ACM_NW; i++)
- usb_kill_urb(acm->wb[i].urb);
- for (i = 0; i < acm->rx_buflimit; i++)
- usb_kill_urb(acm->read_urbs[i]);
- acm->control->needs_remote_wakeup = 0;
- usb_autopm_put_interface(acm->control);
+ acm_set_control(acm, acm->ctrlout = 0);
+
+ /*
+ * Need to grab write_lock to prevent race with resume, but no need to
+ * hold it due to the tty-port initialised flag.
+ */
+ spin_lock_irq(&acm->write_lock);
+ spin_unlock_irq(&acm->write_lock);
+
+ usb_autopm_get_interface_no_resume(acm->control);
+ acm->control->needs_remote_wakeup = 0;
+ usb_autopm_put_interface(acm->control);
+
+ for (;;) {
+ urb = usb_get_from_anchor(&acm->delayed);
+ if (!urb)
+ break;
+ wb = urb->context;
+ wb->use = 0;
+ usb_autopm_put_interface_async(acm->control);
}
- mutex_unlock(&acm->mutex);
+
+ usb_kill_urb(acm->ctrlurb);
+ for (i = 0; i < ACM_NW; i++)
+ usb_kill_urb(acm->wb[i].urb);
+ for (i = 0; i < acm->rx_buflimit; i++)
+ usb_kill_urb(acm->read_urbs[i]);
}
static void acm_tty_cleanup(struct tty_struct *tty)
memcpy(wb->buf, buf, count);
wb->len = count;
- usb_autopm_get_interface_async(acm->control);
+ stat = usb_autopm_get_interface_async(acm->control);
+ if (stat) {
+ wb->use = 0;
+ spin_unlock_irqrestore(&acm->write_lock, flags);
+ return stat;
+ }
+
if (acm->susp_count) {
- if (!acm->delayed_wb)
- acm->delayed_wb = wb;
- else
- usb_autopm_put_interface_async(acm->control);
+ usb_anchor_urb(wb->urb, &acm->delayed);
spin_unlock_irqrestore(&acm->write_lock, flags);
- return count; /* A white lie */
+ return count;
}
- usb_mark_last_busy(acm->dev);
stat = acm_start_wb(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
acm->bInterval = epread->bInterval;
tty_port_init(&acm->port);
acm->port.ops = &acm_port_ops;
+ init_usb_anchor(&acm->delayed);
buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
if (!buf) {
struct acm *acm = usb_get_intfdata(intf);
int cnt;
+ spin_lock_irq(&acm->write_lock);
if (PMSG_IS_AUTO(message)) {
- int b;
-
- spin_lock_irq(&acm->write_lock);
- b = acm->transmitting;
- spin_unlock_irq(&acm->write_lock);
- if (b)
+ if (acm->transmitting) {
+ spin_unlock_irq(&acm->write_lock);
return -EBUSY;
+ }
}
-
- spin_lock_irq(&acm->read_lock);
- spin_lock(&acm->write_lock);
cnt = acm->susp_count++;
- spin_unlock(&acm->write_lock);
- spin_unlock_irq(&acm->read_lock);
+ spin_unlock_irq(&acm->write_lock);
if (cnt)
return 0;
- if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
- stop_data_traffic(acm);
+ stop_data_traffic(acm);
return 0;
}
static int acm_resume(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
- struct acm_wb *wb;
+ struct urb *urb;
int rv = 0;
- int cnt;
- spin_lock_irq(&acm->read_lock);
- acm->susp_count -= 1;
- cnt = acm->susp_count;
- spin_unlock_irq(&acm->read_lock);
+ spin_lock_irq(&acm->write_lock);
- if (cnt)
- return 0;
+ if (--acm->susp_count)
+ goto out;
if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
- rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
+ rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
- spin_lock_irq(&acm->write_lock);
- if (acm->delayed_wb) {
- wb = acm->delayed_wb;
- acm->delayed_wb = NULL;
- spin_unlock_irq(&acm->write_lock);
- acm_start_wb(acm, wb);
- } else {
- spin_unlock_irq(&acm->write_lock);
+ for (;;) {
+ urb = usb_get_from_anchor(&acm->delayed);
+ if (!urb)
+ break;
+
+ acm_start_wb(acm, urb->context);
}
/*
* do the write path at all cost
*/
if (rv < 0)
- goto err_out;
+ goto out;
- rv = acm_submit_read_urbs(acm, GFP_NOIO);
+ rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
}
+out:
+ spin_unlock_irq(&acm->write_lock);
-err_out:
return rv;
}
git.openpandora.org / pandora-kernel.git / blobdiff