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wait_for_completion(9) [centos man page]

WAIT_FOR_COMPLETION(9)						   Driver Basics					    WAIT_FOR_COMPLETION(9)

wait_for_completion - waits for completion of a task SYNOPSIS
void __sched wait_for_completion(struct completion * x); ARGUMENTS
x holds the state of this particular completion DESCRIPTION
This waits to be signaled for completion of a specific task. It is NOT interruptible and there is no timeout. See also similar routines (i.e. wait_for_completion_timeout) with timeout and interrupt capability. Also see complete. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 WAIT_FOR_COMPLETION(9)

Check Out this Related Man Page

USB_BULK_MSG(9) 						   USB Core APIs						   USB_BULK_MSG(9)

usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion SYNOPSIS
int usb_bulk_msg(struct usb_device * usb_dev, unsigned int pipe, void * data, int len, int * actual_length, int timeout); ARGUMENTS
usb_dev pointer to the usb device to send the message to pipe endpoint "pipe" to send the message to data pointer to the data to send len length in bytes of the data to send actual_length pointer to a location to put the actual length transferred in bytes timeout time in msecs to wait for the message to complete before timing out (if 0 the wait is forever) CONTEXT
!in_interrupt () DESCRIPTION
This function sends a simple bulk message to a specified endpoint and waits for the message to complete, or timeout. If successful, it returns 0, otherwise a negative error number. The number of actual bytes transferred will be stored in the actual_length paramater. Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send a message from within interrupt context, use usb_submit_urb If a thread in your driver uses this call, make sure your disconnect method can wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request. Because there is no usb_interrupt_msg and no USBDEVFS_INTERRUPT ioctl, users are forced to abuse this routine by using it to submit URBs for interrupt endpoints. We will take the liberty of creating an interrupt URB (with the default interval) if the target is an interrupt endpoint. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 USB_BULK_MSG(9)
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