Source of usb-skeleton.c - linux-imx - PHYTEC BitBucket (Stash)

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    spin_unlock_irq(&dev->err_lock);
​
    mutex_unlock(&dev->io_mutex);
​
    return res;
}
​
static void skel_read_bulk_callback(struct urb *urb)
{
    struct usb_skel *dev;
    unsigned long flags;
​
    dev = urb->context;
​
    spin_lock(&dev->err_lock);
    spin_lock_irqsave(&dev->err_lock, flags);
    /* sync/async unlink faults aren't errors */
    if (urb->status) {
        if (!(urb->status == -ENOENT ||
            urb->status == -ECONNRESET ||
            urb->status == -ESHUTDOWN))
            dev_err(&dev->interface->dev,
                "%s - nonzero write bulk status received: %d\n",
                __func__, urb->status);
​
        dev->errors = urb->status;
    } else {
        dev->bulk_in_filled = urb->actual_length;
    }
    dev->ongoing_read = 0;
    spin_unlock(&dev->err_lock);
    spin_unlock_irqrestore(&dev->err_lock, flags);
​
    wake_up_interruptible(&dev->bulk_in_wait);
}
​
static int skel_do_read_io(struct usb_skel *dev, size_t count)
{
    int rv;
​
    /* prepare a read */
    usb_fill_bulk_urb(dev->bulk_in_urb,
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            goto retry;
    }
exit:
    mutex_unlock(&dev->io_mutex);
    return rv;
}
​
static void skel_write_bulk_callback(struct urb *urb)
{
    struct usb_skel *dev;
    unsigned long flags;
​
    dev = urb->context;
​
    /* sync/async unlink faults aren't errors */
    if (urb->status) {
        if (!(urb->status == -ENOENT ||
            urb->status == -ECONNRESET ||
            urb->status == -ESHUTDOWN))
            dev_err(&dev->interface->dev,
                "%s - nonzero write bulk status received: %d\n",
                __func__, urb->status);
​
        spin_lock(&dev->err_lock);
        spin_lock_irqsave(&dev->err_lock, flags);
        dev->errors = urb->status;
        spin_unlock(&dev->err_lock);
        spin_unlock_irqrestore(&dev->err_lock, flags);
    }
​
    /* free up our allocated buffer */
    usb_free_coherent(urb->dev, urb->transfer_buffer_length,
              urb->transfer_buffer, urb->transfer_dma);
    up(&dev->limit_sem);
}
​
static ssize_t skel_write(struct file *file, const char *user_buffer,
              size_t count, loff_t *ppos)