/********************************************************************* * * Filename: irlan_provider_event.c * Version: 0.9 * Description: IrLAN provider state machine) * Status: Experimental. * Author: Dag Brattli * Created at: Sun Aug 31 20:14:37 1997 * Modified at: Sat Oct 30 12:52:41 1999 * Modified by: Dag Brattli * * Copyright (c) 1998-1999 Dag Brattli , All Rights Reserved. * * 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. * * Neither Dag Brattli nor University of Tromsø admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. * ********************************************************************/ #include #include #include #include #include #include static int irlan_provider_state_idle(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb); static int irlan_provider_state_info(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb); static int irlan_provider_state_open(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb); static int irlan_provider_state_data(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb); static int (*state[])(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb) = { irlan_provider_state_idle, NULL, /* Query */ NULL, /* Info */ irlan_provider_state_info, NULL, /* Media */ irlan_provider_state_open, NULL, /* Wait */ NULL, /* Arb */ irlan_provider_state_data, NULL, /* Close */ NULL, /* Sync */ }; void irlan_do_provider_event(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb) { IRDA_ASSERT(*state[ self->provider.state] != NULL, return;); (*state[self->provider.state]) (self, event, skb); } /* * Function irlan_provider_state_idle (event, skb, info) * * IDLE, We are waiting for an indication that there is a provider * available. */ static int irlan_provider_state_idle(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb) { IRDA_ASSERT(self != NULL, return -1;); switch(event) { case IRLAN_CONNECT_INDICATION: irlan_provider_connect_response( self, self->provider.tsap_ctrl); irlan_next_provider_state( self, IRLAN_INFO); break; default: pr_debug("%s(), Unknown event %d\n", __func__ , event); break; } if (skb) dev_kfree_skb(skb); return 0; } /* * Function irlan_provider_state_info (self, event, skb, info) * * INFO, We have issued a GetInfo command and is awaiting a reply. */ static int irlan_provider_state_info(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb) { int ret; IRDA_ASSERT(self != NULL, return -1;); switch(event) { case IRLAN_GET_INFO_CMD: /* Be sure to use 802.3 in case of peer mode */ if (self->provider.access_type == ACCESS_PEER) { self->media = MEDIA_802_3; /* Check if client has started yet */ if (self->client.state == IRLAN_IDLE) { /* This should get the client going */ irlmp_discovery_request(8); } } irlan_provider_send_reply(self, CMD_GET_PROVIDER_INFO, RSP_SUCCESS); /* Keep state */ break; case IRLAN_GET_MEDIA_CMD: irlan_provider_send_reply(self, CMD_GET_MEDIA_CHAR, RSP_SUCCESS); /* Keep state */ break; case IRLAN_OPEN_DATA_CMD: ret = irlan_parse_open_data_cmd(self, skb); if (self->provider.access_type == ACCESS_PEER) { /* FIXME: make use of random functions! */ self->provider.send_arb_val = (jiffies & 0xffff); } irlan_provider_send_reply(self, CMD_OPEN_DATA_CHANNEL, ret); if (ret == RSP_SUCCESS) { irlan_next_provider_state(self, IRLAN_OPEN); /* Signal client that we are now open */ irlan_do_client_event(self, IRLAN_PROVIDER_SIGNAL, NULL); } break; case IRLAN_LMP_DISCONNECT: /* FALLTHROUGH */ case IRLAN_LAP_DISCONNECT: irlan_next_provider_state(self, IRLAN_IDLE); break; default: pr_debug("%s(), Unknown event %d\n", __func__ , event); break; } if (skb) dev_kfree_skb(skb); return 0; } /* * Function irlan_provider_state_open (self, event, skb, info) * * OPEN, The client has issued a OpenData command and is awaiting a * reply * */ static int irlan_provider_state_open(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb) { IRDA_ASSERT(self != NULL, return -1;); switch(event) { case IRLAN_FILTER_CONFIG_CMD: irlan_provider_parse_command(self, CMD_FILTER_OPERATION, skb); irlan_provider_send_reply(self, CMD_FILTER_OPERATION, RSP_SUCCESS); /* Keep state */ break; case IRLAN_DATA_CONNECT_INDICATION: irlan_next_provider_state(self, IRLAN_DATA); irlan_provider_connect_response(self, self->tsap_data); break; case IRLAN_LMP_DISCONNECT: /* FALLTHROUGH */ case IRLAN_LAP_DISCONNECT: irlan_next_provider_state(self, IRLAN_IDLE); break; default: pr_debug("%s(), Unknown event %d\n", __func__ , event); break; } if (skb) dev_kfree_skb(skb); return 0; } /* * Function irlan_provider_state_data (self, event, skb, info) * * DATA, The data channel is connected, allowing data transfers between * the local and remote machines. * */ static int irlan_provider_state_data(struct irlan_cb *self, IRLAN_EVENT event, struct sk_buff *skb) { IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;); switch(event) { case IRLAN_FILTER_CONFIG_CMD: irlan_provider_parse_command(self, CMD_FILTER_OPERATION, skb); irlan_provider_send_reply(self, CMD_FILTER_OPERATION, RSP_SUCCESS); break; case IRLAN_LMP_DISCONNECT: /* FALLTHROUGH */ case IRLAN_LAP_DISCONNECT: irlan_next_provider_state(self, IRLAN_IDLE); break; default: pr_debug("%s(), Unknown event %d\n", __func__ , event); break; } if (skb) dev_kfree_skb(skb); return 0; } ints to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/trace/events/printk.h')