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Commit f3784d83 authored by Roger Quadros's avatar Roger Quadros Committed by Marcel Holtmann
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Bluetooth: Ensure that HCI sysfs add/del is preempt safe 



Use a different work_struct variables for add_conn() and del_conn() and
use single work queue instead of two for adding and deleting connections.

It eliminates the following error on a preemptible kernel:

[  204.358032] Unable to handle kernel NULL pointer dereference at virtual address 0000000c
[  204.370697] pgd = c0004000
[  204.373443] [0000000c] *pgd=00000000
[  204.378601] Internal error: Oops: 17 [#1] PREEMPT
[  204.383361] Modules linked in: vfat fat rfcomm sco l2cap sd_mod scsi_mod iphb pvr2d drm omaplfb ps
[  204.438537] CPU: 0    Not tainted  (2.6.28-maemo2 #1)
[  204.443664] PC is at klist_put+0x2c/0xb4
[  204.447601] LR is at klist_put+0x18/0xb4
[  204.451568] pc : [<c0270f08>]    lr : [<c0270ef4>]    psr: a0000113
[  204.451568] sp : cf1b3f10  ip : cf1b3f10  fp : cf1b3f2c
[  204.463104] r10: 00000000  r9 : 00000000  r8 : bf08029c
[  204.468353] r7 : c7869200  r6 : cfbe2690  r5 : c78692c8  r4 : 00000001
[  204.474945] r3 : 00000001  r2 : cf1b2000  r1 : 00000001  r0 : 00000000
[  204.481506] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM Segment kernel
[  204.488861] Control: 10c5387d  Table: 887fc018  DAC: 00000017
[  204.494628] Process btdelconn (pid: 515, stack limit = 0xcf1b22e0)

Signed-off-by: default avatarRoger Quadros <ext-roger.quadros@nokia.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent bf368e4e

include/net/bluetooth/hci_core.h

+2 −1
Original line number Diff line number Diff line
@@ -180,7 +180,8 @@ struct hci_conn { 
	struct timer_list disc_timer;

	struct timer_list idle_timer;



	struct work_struct work;

	struct work_struct work_add;

	struct work_struct work_del;



	struct device	dev;

net/bluetooth/hci_sysfs.c

+16 −21
Original line number Diff line number Diff line
@@ -9,8 +9,7 @@ 
struct class *bt_class = NULL;

EXPORT_SYMBOL_GPL(bt_class);



static struct workqueue_struct *btaddconn;

static struct workqueue_struct *btdelconn;

static struct workqueue_struct *bluetooth;



static inline char *link_typetostr(int type)

{
@@ -88,9 +87,10 @@ static struct device_type bt_link = { 


static void add_conn(struct work_struct *work)

{

	struct hci_conn *conn = container_of(work, struct hci_conn, work);

	struct hci_conn *conn = container_of(work, struct hci_conn, work_add);



	flush_workqueue(btdelconn);

	/* ensure previous add/del is complete */

	flush_workqueue(bluetooth);



	if (device_add(&conn->dev) < 0) {

		BT_ERR("Failed to register connection device");
@@ -114,9 +114,9 @@ void hci_conn_add_sysfs(struct hci_conn *conn) 


	device_initialize(&conn->dev);



	INIT_WORK(&conn->work, add_conn);

	INIT_WORK(&conn->work_add, add_conn);



	queue_work(btaddconn, &conn->work);

	queue_work(bluetooth, &conn->work_add);

}



/*
@@ -131,9 +131,12 @@ static int __match_tty(struct device *dev, void *data) 


static void del_conn(struct work_struct *work)

{

	struct hci_conn *conn = container_of(work, struct hci_conn, work);

	struct hci_conn *conn = container_of(work, struct hci_conn, work_del);

	struct hci_dev *hdev = conn->hdev;



	/* ensure previous add/del is complete */

	flush_workqueue(bluetooth);



	while (1) {

		struct device *dev;
@@ -156,9 +159,9 @@ void hci_conn_del_sysfs(struct hci_conn *conn) 
	if (!device_is_registered(&conn->dev))

		return;



	INIT_WORK(&conn->work, del_conn);

	INIT_WORK(&conn->work_del, del_conn);



	queue_work(btdelconn, &conn->work);

	queue_work(bluetooth, &conn->work_del);

}



static inline char *host_typetostr(int type)
@@ -435,20 +438,13 @@ void hci_unregister_sysfs(struct hci_dev *hdev) 


int __init bt_sysfs_init(void)

{

	btaddconn = create_singlethread_workqueue("btaddconn");

	if (!btaddconn)

		return -ENOMEM;



	btdelconn = create_singlethread_workqueue("btdelconn");

	if (!btdelconn) {

		destroy_workqueue(btaddconn);

	bluetooth = create_singlethread_workqueue("bluetooth");

	if (!bluetooth)

		return -ENOMEM;

	}



	bt_class = class_create(THIS_MODULE, "bluetooth");

	if (IS_ERR(bt_class)) {

		destroy_workqueue(btdelconn);

		destroy_workqueue(btaddconn);

		destroy_workqueue(bluetooth);

		return PTR_ERR(bt_class);

	}
@@ -457,8 +453,7 @@ int __init bt_sysfs_init(void) 


void bt_sysfs_cleanup(void)

{

	destroy_workqueue(btaddconn);

	destroy_workqueue(btdelconn);

	destroy_workqueue(bluetooth);



	class_destroy(bt_class);

}