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Bluetooth: Convert RFCOMM spinlocks into mutexes

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Enabling CONFIG_DEBUG_ATOMIC_SLEEP has shown that some rfcomm functions
acquiring spinlocks call sleeping locks further in the chain.  Converting
the offending spinlocks into mutexes makes sleeping safe.

Signed-off-by: Libor Pechacek <lpechacek@suse.cz>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Libor Pechacek 2014-04-29 20:38:34 +02:00 • committed by Marcel Holtmann
parent 22e7078641
commit 86aae6c7b5
3 changed files with 14 additions and 14 deletions
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6
include/net/bluetooth/rfcomm.h
View file

@ -173,7 +173,7 @@ struct rfcomm_dlc {
struct sk_buff_head tx_queue; struct sk_buff_head tx_queue;
struct timer_list timer; struct timer_list timer;
spinlock_t lock; struct mutex lock;
unsigned long state; unsigned long state;
unsigned long flags; unsigned long flags;
atomic_t refcnt; atomic_t refcnt;
@ -244,8 +244,8 @@ int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig);
void rfcomm_dlc_accept(struct rfcomm_dlc *d); void rfcomm_dlc_accept(struct rfcomm_dlc *d);
struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel); struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel);
#define rfcomm_dlc_lock(d) spin_lock(&d->lock) #define rfcomm_dlc_lock(d) mutex_lock(&d->lock)
#define rfcomm_dlc_unlock(d) spin_unlock(&d->lock) #define rfcomm_dlc_unlock(d) mutex_unlock(&d->lock)
static inline void rfcomm_dlc_hold(struct rfcomm_dlc *d) static inline void rfcomm_dlc_hold(struct rfcomm_dlc *d)
{ {

2
net/bluetooth/rfcomm/core.c
View file

@ -307,7 +307,7 @@ struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d); setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
skb_queue_head_init(&d->tx_queue); skb_queue_head_init(&d->tx_queue);
spin_lock_init(&d->lock); mutex_init(&d->lock);
atomic_set(&d->refcnt, 1); atomic_set(&d->refcnt, 1);
rfcomm_dlc_clear_state(d); rfcomm_dlc_clear_state(d);

20
net/bluetooth/rfcomm/tty.c
View file

@ -70,7 +70,7 @@ struct rfcomm_dev {
}; };
static LIST_HEAD(rfcomm_dev_list); static LIST_HEAD(rfcomm_dev_list);
static DEFINE_SPINLOCK(rfcomm_dev_lock); static DEFINE_MUTEX(rfcomm_dev_lock);
static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb); static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err); static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
@ -96,9 +96,9 @@ static void rfcomm_dev_destruct(struct tty_port *port)
if (dev->tty_dev) if (dev->tty_dev)
tty_unregister_device(rfcomm_tty_driver, dev->id); tty_unregister_device(rfcomm_tty_driver, dev->id);
spin_lock(&rfcomm_dev_lock); mutex_lock(&rfcomm_dev_lock);
list_del(&dev->list); list_del(&dev->list);
spin_unlock(&rfcomm_dev_lock); mutex_unlock(&rfcomm_dev_lock);
kfree(dev); kfree(dev);
@ -161,14 +161,14 @@ static struct rfcomm_dev *rfcomm_dev_get(int id)
{ {
struct rfcomm_dev *dev; struct rfcomm_dev *dev;
spin_lock(&rfcomm_dev_lock); mutex_lock(&rfcomm_dev_lock);
dev = __rfcomm_dev_lookup(id); dev = __rfcomm_dev_lookup(id);
if (dev && !tty_port_get(&dev->port)) if (dev && !tty_port_get(&dev->port))
dev = NULL; dev = NULL;
spin_unlock(&rfcomm_dev_lock); mutex_unlock(&rfcomm_dev_lock);
return dev; return dev;
} }
@ -224,7 +224,7 @@ static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req,
if (!dev) if (!dev)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
spin_lock(&rfcomm_dev_lock); mutex_lock(&rfcomm_dev_lock);
if (req->dev_id < 0) { if (req->dev_id < 0) {
dev->id = 0; dev->id = 0;
@ -305,11 +305,11 @@ static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req,
holds reference to this module. */ holds reference to this module. */
__module_get(THIS_MODULE); __module_get(THIS_MODULE);
spin_unlock(&rfcomm_dev_lock); mutex_unlock(&rfcomm_dev_lock);
return dev; return dev;
out: out:
spin_unlock(&rfcomm_dev_lock); mutex_unlock(&rfcomm_dev_lock);
kfree(dev); kfree(dev);
return ERR_PTR(err); return ERR_PTR(err);
} }
@ -524,7 +524,7 @@ static int rfcomm_get_dev_list(void __user *arg)
di = dl->dev_info; di = dl->dev_info;
spin_lock(&rfcomm_dev_lock); mutex_lock(&rfcomm_dev_lock);
list_for_each_entry(dev, &rfcomm_dev_list, list) { list_for_each_entry(dev, &rfcomm_dev_list, list) {
if (!tty_port_get(&dev->port)) if (!tty_port_get(&dev->port))
@ -540,7 +540,7 @@ static int rfcomm_get_dev_list(void __user *arg)
break; break;
} }
spin_unlock(&rfcomm_dev_lock); mutex_unlock(&rfcomm_dev_lock);
dl->dev_num = n; dl->dev_num = n;
size = sizeof(*dl) + n * sizeof(*di); size = sizeof(*dl) + n * sizeof(*di);