Man page 9 : request_firmware_nowait

request_firmware_nowait - asynchronous version of request_firmware

int request_firmware_nowait(struct module *  module , bool  uevent , const char *  name , struct device *  device , gfp_t  gfp , void *  context , void (* cont ) (const struct firmware *fw, void *context));

module
    module requesting the firmware

uevent
    sends uevent to copy the firmware image if this flag is non-zero else the firmware copy must be done manually.

name
    name of firmware file

device
    device for which firmware is being loaded

gfp
    allocation flags

context
    will be passed over to cont, and fw may be NULL if firmware request fails.

cont
    function will be called asynchronously when the firmware request is over.

Caller must hold the reference count of device.

Asynchronous variant of request_firmware for user contexts: - sleep for as small periods as possible since it may increase kernel boot time of built-in device drivers requesting firmware in their ->probe methods, if gfp is GFP_KERNEL.

- canAqt sleep at all if gfp is GFP_ATOMIC.