/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * FDDI-type device handling. * * Version: @(#)fddi.c 1.0.0 08/12/96 * * Authors: Lawrence V. Stefani, * * fddi.c is based on previous eth.c and tr.c work by * Ross Biro * Fred N. van Kempen, * Mark Evans, * Florian La Roche, * Alan Cox, * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Changes * Alan Cox : New arp/rebuild header * Maciej W. Rozycki : IPv6 support */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Create the FDDI MAC header for an arbitrary protocol layer * * saddr=NULL means use device source address * daddr=NULL means leave destination address (eg unresolved arp) */ static int fddi_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned int len) { int hl = FDDI_K_SNAP_HLEN; struct fddihdr *fddi; if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP) hl=FDDI_K_8022_HLEN-3; fddi = (struct fddihdr *)skb_push(skb, hl); fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF; if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP) { fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP; fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP; fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD; fddi->hdr.llc_snap.oui[0] = 0x00; fddi->hdr.llc_snap.oui[1] = 0x00; fddi->hdr.llc_snap.oui[2] = 0x00; fddi->hdr.llc_snap.ethertype = htons(type); } /* Set the source and destination hardware addresses */ if (saddr != NULL) memcpy(fddi->saddr, saddr, dev->addr_len); else memcpy(fddi->saddr, dev->dev_addr, dev->addr_len); if (daddr != NULL) { memcpy(fddi->daddr, daddr, dev->addr_len); return hl; } return -hl; } /* * Determine the packet's protocol ID and fill in skb fields. * This routine is called before an incoming packet is passed * up. It's used to fill in specific skb fields and to set * the proper pointer to the start of packet data (skb->data). */ __be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev) { struct fddihdr *fddi = (struct fddihdr *)skb->data; __be16 type; /* * Set mac.raw field to point to FC byte, set data field to point * to start of packet data. Assume 802.2 SNAP frames for now. */ skb->dev = dev; skb_reset_mac_header(skb); /* point to frame control (FC) */ if(fddi->hdr.llc_8022_1.dsap==0xe0) { skb_pull(skb, FDDI_K_8022_HLEN-3); type = htons(ETH_P_802_2); } else { skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */ type=fddi->hdr.llc_snap.ethertype; } /* Set packet type based on destination address and flag settings */ if (*fddi->daddr & 0x01) { if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0) skb->pkt_type = PACKET_BROADCAST; else skb->pkt_type = PACKET_MULTICAST; } else if (dev->flags & IFF_PROMISC) { if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN)) skb->pkt_type = PACKET_OTHERHOST; } /* Assume 802.2 SNAP frames, for now */ return type; } EXPORT_SYMBOL(fddi_type_trans); static const struct header_ops fddi_header_ops = { .create = fddi_header, }; static void fddi_setup(struct net_device *dev) { dev->header_ops = &fddi_header_ops; dev->type = ARPHRD_FDDI; dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */ dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */ dev->min_mtu = FDDI_K_SNAP_HLEN; dev->max_mtu = FDDI_K_SNAP_DLEN; dev->addr_len = FDDI_K_ALEN; dev->tx_queue_len = 100; /* Long queues on FDDI */ dev->flags = IFF_BROADCAST | IFF_MULTICAST; memset(dev->broadcast, 0xFF, FDDI_K_ALEN); } /** * alloc_fddidev - Register FDDI device * @sizeof_priv: Size of additional driver-private structure to be allocated * for this FDDI device * * Fill in the fields of the device structure with FDDI-generic values. * * Constructs a new net device, complete with a private data area of * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for * this private data area. */ struct net_device *alloc_fddidev(int sizeof_priv) { return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN, fddi_setup); } EXPORT_SYMBOL(alloc_fddidev); MODULE_LICENSE("GPL"); e0a94d9ad8b3ce2d0'>patch) tree77cadb6d8aad1b52c34e4afa8c9deef603bbe2ed /net/packet/Kconfig parent4e5b54f127426c82dc2816340c26d951a5bb3429 (diff)
drm: Don't race connector registration
I was under the misconception that the sysfs dev stuff can be fully set up, and then registered all in one step with device_add. That's true for properties and property groups, but not for parents and child devices. Those must be fully registered before you can register a child. Add a bit of tracking to make sure that asynchronous mst connector hotplugging gets this right. For consistency we rely upon the implicit barriers of the connector->mutex, which is taken anyway, to ensure that at least either the connector or device registration call will work out. Mildly tested since I can't reliably reproduce this on my mst box here. Reported-by: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1484237756-2720-1-git-send-email-daniel.vetter@ffwll.ch
Diffstat (limited to 'net/packet/Kconfig')