usb_fill_bulk_urb(9)

💅 usb_fill_bulk_urb(9) 💅

okay bestie, welcome to the Kernel API Manual — this one's a macro, and it's here to help you initialize a bulk urb ✨ no cap.

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🌸 NAME 🌸

usb_fill_bulk_urb — the macro that helps you initialize a bulk urb 🎀

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✨ SYNOPSIS ✨

void usb_fill_bulk_urb (struct urb *urb , struct usb_device *dev ,
unsigned int pipe , void *transfer_buffer , int buffer_length ,
usb_complete_t complete_fn , void *context );

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🫶 ARGUMENTS 🫶

• urb — pointer to the urb you're about to initialize. that's your main character rn 👑
• dev — pointer to the struct usb_device for this urb.
• pipe — the endpoint pipe 🧚
• transfer_buffer — pointer to the transfer buffer. and listen, the buffer must be suitable for DMA. like, that's not a vibe suggestion, that's a requirement 💀
• buffer_length — length of the transfer buffer.
• complete_fn — pointer to the usb_complete_t function.
• context — what to set the urb context to.

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🦋 DESCRIPTION 🦋

So what does it actually do? it initializes a bulk urb with the proper information you need to submit it to a device. that's it, that's the whole slay 🌈

heads up bestie: go read usb_fill_control_urb for a description of the requirements for transfer_buffer — the lore lives there, iykyk 💜

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🔥 SEE ALSO 🔥

Kernel file ./include/linux/usb.h plus a whole squad of friends — literally the entire group chat:

• struct usb_host_endpoint(9)
• struct usb_interface(9)
• usb_set_intfdata(9)
• struct usb_interface_cache(9)
• struct usb_host_config(9)
• struct usb_device(9)
• usb_hub_for_each_child(9)
• usb_interface_claimed(9)
• usb_make_path(9)
• USB_DEVICE(9)
• USB_DEVICE_VER(9)
• USB_DEVICE_INTERFACE_CLASS(9)
• USB_DEVICE_INTERFACE_PROTOCOL(9)
• USB_DEVICE_INTERFACE_NUMBER(9)
• USB_DEVICE_INFO(9)
• USB_INTERFACE_INFO(9)
• USB_DEVICE_AND_INTERFACE_INFO(9)
• USB_VENDOR_AND_INTERFACE_INFO(9)
• struct usb_driver(9)
• struct usb_device_driver(9)
• struct usb_class_driver(9)
• module_usb_driver(9)
• struct urb(9)
• usb_fill_control_urb(9)
• usb_fill_int_urb(9)
• usb_urb_dir_in(9)
• usb_urb_dir_out(9)
• struct usb_sg_request(9)

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and that's the page, bestie 🫶 this lil gem lives over in ./include/linux and it's dated October 2026, filed under usb_fill_bulk_urb(9) — go forth and initialize urbs, you've got this 💖✨🎀