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author | Ville Tervo <ville.tervo@nokia.com> | 2007-07-11 09:23:41 +0200 |
---|---|---|
committer | Willy Tarreau <w@1wt.eu> | 2007-08-25 17:24:16 +0200 |
commit | 8c25e9c9cd1fed0d5f57075b584c39a4b9af9830 (patch) | |
tree | 777809c83d98561e0992759ecc1fc81bd97d211f | |
parent | b37a2fc49a6b4b0dd4fdc0434f7d7b65a3f9aa3c (diff) | |
download | lwn-8c25e9c9cd1fed0d5f57075b584c39a4b9af9830.tar.gz lwn-8c25e9c9cd1fed0d5f57075b584c39a4b9af9830.zip |
[PATCH] Keep rfcomm_dev on the list until it is freed
This patch changes the RFCOMM TTY release process so that the TTY is kept
on the list until it is really freed. A new device flag is used to keep
track of released TTYs.
Signed-off-by: Ville Tervo <ville.tervo@nokia.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r-- | include/net/bluetooth/rfcomm.h | 1 | ||||
-rw-r--r-- | net/bluetooth/rfcomm/tty.c | 30 |
2 files changed, 23 insertions, 8 deletions
diff --git a/include/net/bluetooth/rfcomm.h b/include/net/bluetooth/rfcomm.h index 3c563f02907c..25aa575db807 100644 --- a/include/net/bluetooth/rfcomm.h +++ b/include/net/bluetooth/rfcomm.h @@ -323,6 +323,7 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc #define RFCOMM_RELEASE_ONHUP 1 #define RFCOMM_HANGUP_NOW 2 #define RFCOMM_TTY_ATTACHED 3 +#define RFCOMM_TTY_RELEASED 4 struct rfcomm_dev_req { s16 dev_id; diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c index e1b866323d43..26e8c022ad93 100644 --- a/net/bluetooth/rfcomm/tty.c +++ b/net/bluetooth/rfcomm/tty.c @@ -93,6 +93,10 @@ static void rfcomm_dev_destruct(struct rfcomm_dev *dev) BT_DBG("dev %p dlc %p", dev, dlc); + write_lock_bh(&rfcomm_dev_lock); + list_del_init(&dev->list); + write_unlock_bh(&rfcomm_dev_lock); + rfcomm_dlc_lock(dlc); /* Detach DLC if it's owned by this dev */ if (dlc->owner == dev) @@ -154,8 +158,13 @@ static inline struct rfcomm_dev *rfcomm_dev_get(int id) read_lock(&rfcomm_dev_lock); dev = __rfcomm_dev_get(id); - if (dev) - rfcomm_dev_hold(dev); + + if (dev) { + if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) + dev = NULL; + else + rfcomm_dev_hold(dev); + } read_unlock(&rfcomm_dev_lock); @@ -263,6 +272,12 @@ out: tty_register_device(rfcomm_tty_driver, dev->id, rfcomm_get_device(dev)); + if (IS_ERR(dev->tty_dev)) { + list_del(&dev->list); + kfree(dev); + return PTR_ERR(dev->tty_dev); + } + return dev->id; } @@ -270,10 +285,7 @@ static void rfcomm_dev_del(struct rfcomm_dev *dev) { BT_DBG("dev %p", dev); - write_lock_bh(&rfcomm_dev_lock); - list_del_init(&dev->list); - write_unlock_bh(&rfcomm_dev_lock); - + set_bit(RFCOMM_TTY_RELEASED, &dev->flags); rfcomm_dev_put(dev); } @@ -327,7 +339,7 @@ static int rfcomm_create_dev(struct sock *sk, void __user *arg) if (copy_from_user(&req, arg, sizeof(req))) return -EFAULT; - BT_DBG("sk %p dev_id %id flags 0x%x", sk, req.dev_id, req.flags); + BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags); if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) return -EPERM; @@ -368,7 +380,7 @@ static int rfcomm_release_dev(void __user *arg) if (copy_from_user(&req, arg, sizeof(req))) return -EFAULT; - BT_DBG("dev_id %id flags 0x%x", req.dev_id, req.flags); + BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags); if (!(dev = rfcomm_dev_get(req.dev_id))) return -ENODEV; @@ -417,6 +429,8 @@ static int rfcomm_get_dev_list(void __user *arg) list_for_each(p, &rfcomm_dev_list) { struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list); + if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) + continue; (di + n)->id = dev->id; (di + n)->flags = dev->flags; (di + n)->state = dev->dlc->state; |