/*
   BlueZ - Bluetooth protocol stack for Linux

   Copyright (C) 2015  Intel Corporation

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/hci_mon.h>
#include <net/bluetooth/mgmt.h>

#include "mgmt_util.h"

static struct sk_buff *create_monitor_ctrl_event(__le16 index, u32 cookie,
						 u16 opcode, u16 len, void *buf)
{
	struct hci_mon_hdr *hdr;
	struct sk_buff *skb;

	skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
	if (!skb)
		return NULL;

	put_unaligned_le32(cookie, skb_put(skb, 4));
	put_unaligned_le16(opcode, skb_put(skb, 2));

	if (buf)
		memcpy(skb_put(skb, len), buf, len);

	__net_timestamp(skb);

	hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
	hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
	hdr->index = index;
	hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);

	return skb;
}

int mgmt_send_event(u16 event, struct hci_dev *hdev, unsigned short channel,
		    void *data, u16 data_len, int flag, struct sock *skip_sk)
{
	struct sk_buff *skb;
	struct mgmt_hdr *hdr;

	skb = alloc_skb(sizeof(*hdr) + data_len, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	hdr = (void *) skb_put(skb, sizeof(*hdr));
	hdr->opcode = cpu_to_le16(event);
	if (hdev)
		hdr->index = cpu_to_le16(hdev->id);
	else
		hdr->index = cpu_to_le16(MGMT_INDEX_NONE);
	hdr->len = cpu_to_le16(data_len);

	if (data)
		memcpy(skb_put(skb, data_len), data, data_len);

	/* Time stamp */
	__net_timestamp(skb);

	hci_send_to_channel(channel, skb, flag, skip_sk);

	if (channel == HCI_CHANNEL_CONTROL)
		hci_send_monitor_ctrl_event(hdev, event, data, data_len,
					    skb_get_ktime(skb), flag, skip_sk);

	kfree_skb(skb);
	return 0;
}

int mgmt_cmd_status(struct sock *sk, u16 index, u16 cmd, u8 status)
{
	struct sk_buff *skb, *mskb;
	struct mgmt_hdr *hdr;
	struct mgmt_ev_cmd_status *ev;
	int err;

	BT_DBG("sock %p, index %u, cmd %u, status %u", sk, index, cmd, status);

	skb = alloc_skb(sizeof(*hdr) + sizeof(*ev), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	hdr = (void *) skb_put(skb, sizeof(*hdr));

	hdr->opcode = cpu_to_le16(MGMT_EV_CMD_STATUS);
	hdr->index = cpu_to_le16(index);
	hdr->len = cpu_to_le16(sizeof(*ev));

	ev = (void *) skb_put(skb, sizeof(*ev));
	ev->status = status;
	ev->opcode = cpu_to_le16(cmd);

	mskb = create_monitor_ctrl_event(hdr->index, hci_sock_get_cookie(sk),
					 MGMT_EV_CMD_STATUS, sizeof(*ev), ev);
	if (mskb)
		skb->tstamp = mskb->tstamp;
	else
		__net_timestamp(skb);

	err = sock_queue_rcv_skb(sk, skb);
	if (err < 0)
		kfree_skb(skb);

	if (mskb) {
		hci_send_to_channel(HCI_CHANNEL_MONITOR, mskb,
				    HCI_SOCK_TRUSTED, NULL);
		kfree_skb(mskb);
	}

	return err;
}

int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
		      void *rp, size_t rp_len)
{
	struct sk_buff *skb, *mskb;
	struct mgmt_hdr *hdr;
	struct mgmt_ev_cmd_complete *ev;
	int err;

	BT_DBG("sock %p", sk);

	skb = alloc_skb(sizeof(*hdr) + sizeof(*ev) + rp_len, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	hdr = (void *) skb_put(skb, sizeof(*hdr));

	hdr->opcode = cpu_to_le16(MGMT_EV_CMD_COMPLETE);
	hdr->index = cpu_to_le16(index);
	hdr->len = cpu_to_le16(sizeof(*ev) + rp_len);

	ev = (void *) skb_put(skb, sizeof(*ev) + rp_len);
	ev->opcode = cpu_to_le16(cmd);
	ev->status = status;

	if (rp)
		memcpy(ev->data, rp, rp_len);

	mskb = create_monitor_ctrl_event(hdr->index, hci_sock_get_cookie(sk),
					 MGMT_EV_CMD_COMPLETE,
					 sizeof(*ev) + rp_len, ev);
	if (mskb)
		skb->tstamp = mskb->tstamp;
	else
		__net_timestamp(skb);

	err = sock_queue_rcv_skb(sk, skb);
	if (err < 0)
		kfree_skb(skb);

	if (mskb) {
		hci_send_to_channel(HCI_CHANNEL_MONITOR, mskb,
				    HCI_SOCK_TRUSTED, NULL);
		kfree_skb(mskb);
	}

	return err;
}

struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
					   struct hci_dev *hdev)
{
	struct mgmt_pending_cmd *cmd;

	list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
		if (hci_sock_get_channel(cmd->sk) != channel)
			continue;
		if (cmd->opcode == opcode)
			return cmd;
	}

	return NULL;
}

struct mgmt_pending_cmd *mgmt_pending_find_data(unsigned short channel,
						u16 opcode,
						struct hci_dev *hdev,
						const void *data)
{
	struct mgmt_pending_cmd *cmd;

	list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
		if (cmd->user_data != data)
			continue;
		if (cmd->opcode == opcode)
			return cmd;
	}

	return NULL;
}

void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
			  void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
			  void *data)
{
	struct mgmt_pending_cmd *cmd, *tmp;

	list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
		if (opcode > 0 && cmd->opcode != opcode)
			continue;

		cb(cmd, data);
	}
}

struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
					  struct hci_dev *hdev,
					  void *data, u16 len)
{
	struct mgmt_pending_cmd *cmd;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd)
		return NULL;

	cmd->opcode = opcode;
	cmd->index = hdev->id;

	cmd->param = kmemdup(data, len, GFP_KERNEL);
	if (!cmd->param) {
		kfree(cmd);
		return NULL;
	}

	cmd->param_len = len;

	cmd->sk = sk;
	sock_hold(sk);

	list_add(&cmd->list, &hdev->mgmt_pending);

	return cmd;
}

void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
{
	sock_put(cmd->sk);
	kfree(cmd->param);
	kfree(cmd);
}

void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
{
	list_del(&cmd->list);
	mgmt_pending_free(cmd);
}
 triggers
the BUG.

Using add_timer_on() is pretty pointless in this code because the timer is
strictlty per CPU, initialized as pinned and all operations which arm the
timer happen on the CPU to which the timer belongs.

Simplify the whole machinery by using mod_timer() instead of add_timer_on()
which avoids the problem because mod_timer() can handle already queued
timers. Use __start_timer() everywhere so the earliest armed expiry time is
preserved.

Reported-by: Erik Veijola &lt;erik.veijola@intel.com&gt;
Tested-by: Borislav Petkov &lt;bp@alien8.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Reviewed-by: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Tony Luck &lt;tony.luck@intel.com&gt;
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>Diffstat</a> (limited to 'drivers/usb/dwc3/dwc3-st.c')</div><table summary='diffstat' class='diffstat'>