drivers/usb/host/fhci-q.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/host/fhci-q.c

Extension

.c

Size

6883 bytes

Lines

282

Domain

Driver Families

Bucket

drivers/usb

Inferred role

Driver Families: implementation source

Status

source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/types.h
• linux/spinlock.h
• linux/errno.h
• linux/slab.h
• linux/list.h
• linux/usb.h
• linux/usb/hcd.h
• fhci.h

Detected Declarations

• function Copyright
• function fhci_add_td_to_frame
• function fhci_add_tds_to_ed
• function fhci_move_td_from_ed_to_done_list
• function free_urb_priv
• function fhci_urb_complete_free
• function fhci_done_td
• function fhci_del_ed_list

Annotated Snippet

if (cc != USB_TD_OK) {
			if (urb->status == -EINPROGRESS)
				urb->status = status_to_error(cc);
		}

		/* count all non-empty packets except control SETUP packet */
		if (td->type != FHCI_TA_SETUP || td->iso_index != 0)
			urb->actual_length += td->actual_len;
	}
}

/* there are some pedning request to unlink */
void fhci_del_ed_list(struct fhci_hcd *fhci, struct ed *ed)
{
	struct td *td = peek_td_from_ed(ed);
	struct urb *urb = td->urb;
	struct urb_priv *urb_priv = urb->hcpriv;

	if (urb_priv->state == URB_DEL) {
		td = fhci_remove_td_from_ed(ed);
		/* HC may have partly processed this TD */
		if (td->status != USB_TD_INPROGRESS)
			fhci_done_td(urb, td);

		/* URB is done;clean up */
		if (++(urb_priv->tds_cnt) == urb_priv->num_of_tds)
			fhci_urb_complete_free(fhci, urb);
	}
}

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/types.h`, `linux/spinlock.h`, `linux/errno.h`, `linux/slab.h`, `linux/list.h`, `linux/usb.h`, `linux/usb/hcd.h`.
• Detected declarations: `function Copyright`, `function fhci_add_td_to_frame`, `function fhci_add_tds_to_ed`, `function fhci_move_td_from_ed_to_done_list`, `function free_urb_priv`, `function fhci_urb_complete_free`, `function fhci_done_td`, `function fhci_del_ed_list`.
• Atlas domain: Driver Families / drivers/usb.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.