From: H Hartley Sweeten Date: Tue, 14 Oct 2014 19:14:40 +0000 (-0700) Subject: staging: comedi: usbduxsigma: introduce usbduxsigma_ao_handle_urb() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=7a5dfb212010e017b8bbc91f8df196258f790f90;p=openwrt%2Fstaging%2Fblogic.git staging: comedi: usbduxsigma: introduce usbduxsigma_ao_handle_urb() Factor the urb handling and resubmit out of the analog output urb completion handler and tidy it up. This allows a common exit path to be used in the completion handler to stop the async command and handle the events. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Reviewed-by: Bernd Porr Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c index a869e38c777b..985c6f08c56e 100644 --- a/drivers/staging/comedi/drivers/usbduxsigma.c +++ b/drivers/staging/comedi/drivers/usbduxsigma.c @@ -349,62 +349,25 @@ static int usbduxsigma_ao_cancel(struct comedi_device *dev, return 0; } -static void usbduxsigma_ao_urb_complete(struct urb *urb) +static void usbduxsigma_ao_handle_urb(struct comedi_device *dev, + struct comedi_subdevice *s, + struct urb *urb) { - struct comedi_device *dev = urb->context; struct usbduxsigma_private *devpriv = dev->private; - struct comedi_subdevice *s = dev->write_subdev; - struct comedi_cmd *cmd = &s->async->cmd; + struct comedi_async *async = s->async; + struct comedi_cmd *cmd = &async->cmd; uint8_t *datap; int ret; int i; - switch (urb->status) { - case 0: - /* success */ - break; - - case -ECONNRESET: - case -ENOENT: - case -ESHUTDOWN: - case -ECONNABORTED: - /* happens after an unlink command */ - if (devpriv->ao_cmd_running) { - usbduxsigma_ao_stop(dev, 0); /* w/o unlink */ - s->async->events |= COMEDI_CB_EOA; - comedi_event(dev, s); - } - return; - - default: - /* a real error */ - if (devpriv->ao_cmd_running) { - dev_err(dev->class_dev, - "%s: non-zero urb status (%d)\n", - __func__, urb->status); - usbduxsigma_ao_stop(dev, 0); /* w/o unlink */ - s->async->events |= (COMEDI_CB_ERROR | COMEDI_CB_EOA); - comedi_event(dev, s); - } - return; - } - - if (!devpriv->ao_cmd_running) - return; - devpriv->ao_counter--; - if ((int)devpriv->ao_counter <= 0) { - /* timer zero, transfer from comedi */ + if (devpriv->ao_counter == 0) { devpriv->ao_counter = devpriv->ao_timer; if (cmd->stop_src == TRIG_COUNT) { - /* not continuous, fixed number of samples */ devpriv->ao_sample_count--; if (devpriv->ao_sample_count < 0) { - usbduxsigma_ao_stop(dev, 0); /* w/o unlink */ - /* acquistion is over, tell comedi */ - s->async->events |= COMEDI_CB_EOA; - comedi_event(dev, s); + async->events |= COMEDI_CB_EOA; return; } } @@ -416,44 +379,85 @@ static void usbduxsigma_ao_urb_complete(struct urb *urb) unsigned int chan = CR_CHAN(cmd->chanlist[i]); unsigned short val; - ret = comedi_buf_get(s, &val); - if (ret < 0) { + if (!comedi_buf_get(s, &val)) { dev_err(dev->class_dev, "buffer underflow\n"); - s->async->events |= (COMEDI_CB_EOA | - COMEDI_CB_OVERFLOW); + async->events |= COMEDI_CB_OVERFLOW; + return; } + *datap++ = val; *datap++ = chan; s->readback[chan] = val; - - s->async->events |= COMEDI_CB_BLOCK; - comedi_event(dev, s); } + async->events |= COMEDI_CB_BLOCK; } - urb->transfer_buffer_length = SIZEOUTBUF; - urb->dev = comedi_to_usb_dev(dev); - urb->status = 0; - if (devpriv->high_speed) - urb->interval = 8; /* uframes */ - else - urb->interval = 1; /* frames */ - urb->number_of_packets = 1; - urb->iso_frame_desc[0].offset = 0; - urb->iso_frame_desc[0].length = SIZEOUTBUF; - urb->iso_frame_desc[0].status = 0; - ret = usb_submit_urb(urb, GFP_ATOMIC); - if (ret < 0) { - dev_err(dev->class_dev, - "%s: urb resubmit failed (%d)\n", - __func__, ret); - if (ret == -EL2NSYNC) + /* if command is still running, resubmit urb */ + if (!(async->events & COMEDI_CB_CANCEL_MASK)) { + urb->transfer_buffer_length = SIZEOUTBUF; + urb->dev = comedi_to_usb_dev(dev); + urb->status = 0; + if (devpriv->high_speed) + urb->interval = 8; /* uframes */ + else + urb->interval = 1; /* frames */ + urb->number_of_packets = 1; + urb->iso_frame_desc[0].offset = 0; + urb->iso_frame_desc[0].length = SIZEOUTBUF; + urb->iso_frame_desc[0].status = 0; + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret < 0) { dev_err(dev->class_dev, - "buggy USB host controller or bug in IRQ handler\n"); - usbduxsigma_ao_stop(dev, 0); /* w/o unlink */ - s->async->events |= (COMEDI_CB_EOA | COMEDI_CB_ERROR); - comedi_event(dev, s); + "%s: urb resubmit failed (%d)\n", + __func__, ret); + if (ret == -EL2NSYNC) + dev_err(dev->class_dev, + "buggy USB host controller or bug in IRQ handler\n"); + async->events |= COMEDI_CB_ERROR; + } + } +} + +static void usbduxsigma_ao_urb_complete(struct urb *urb) +{ + struct comedi_device *dev = urb->context; + struct usbduxsigma_private *devpriv = dev->private; + struct comedi_subdevice *s = dev->write_subdev; + struct comedi_async *async = s->async; + + /* exit if not running a command, do not resubmit urb */ + if (!devpriv->ao_cmd_running) + return; + + switch (urb->status) { + case 0: + usbduxsigma_ao_handle_urb(dev, s, urb); + break; + + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + case -ECONNABORTED: + /* happens after an unlink command */ + async->events |= COMEDI_CB_ERROR; + break; + + default: + /* a real error */ + dev_err(dev->class_dev, "%s: non-zero urb status (%d)\n", + __func__, urb->status); + async->events |= COMEDI_CB_ERROR; + break; } + + /* + * comedi_handle_events() cannot be used in this driver. The (*cancel) + * operation would unlink the urb. + */ + if (async->events & COMEDI_CB_CANCEL_MASK) + usbduxsigma_ao_stop(dev, 0); + + comedi_event(dev, s); } static int usbduxsigma_submit_urbs(struct comedi_device *dev,