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| author |   Peter Hurley <peter@hurleysoftware.com> | 2014-02-09 20:59:07 -0500 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2014-02-14 13:39:29 -0800 |
| commit | 1c64834e0624c61735308138e67cc3b527f41621 (patch) | |
| tree | 912156866fbaa316a2197f261646737f95a88e57 /include/net/bluetooth/rfcomm.h | |
| parent | Bluetooth: Exclude released devices from RFCOMMGETDEVLIST ioctl (diff) | |
| download | linux-dev-1c64834e0624c61735308138e67cc3b527f41621.tar.xz linux-dev-1c64834e0624c61735308138e67cc3b527f41621.zip | |
Bluetooth: Release rfcomm_dev only once
No logic prevents an rfcomm_dev from being released multiple
times. For example, if the rfcomm_dev ref count is large due
to pending tx, then multiple RFCOMMRELEASEDEV ioctls may
mistakenly release the rfcomm_dev too many times. Note that
concurrent ioctls are not required to create this condition.
Introduce RFCOMM_DEV_RELEASED status bit which guarantees the
rfcomm_dev can only be released once.
NB: Since the flags are exported to userspace, introduce the status
field to track state for which userspace should not be aware.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-By: Alexander Holler <holler@ahsoftware.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'include/net/bluetooth/rfcomm.h')
| -rw-r--r-- | include/net/bluetooth/rfcomm.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/net/bluetooth/rfcomm.h b/include/net/bluetooth/rfcomm.h index c312cfc4e922..b9759eb17cdd 100644 --- a/include/net/bluetooth/rfcomm.h +++ b/include/net/bluetooth/rfcomm.h @@ -324,11 +324,15 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, #define RFCOMMGETDEVINFO _IOR('R', 211, int) #define RFCOMMSTEALDLC _IOW('R', 220, int) +/* rfcomm_dev.flags bit definitions */ #define RFCOMM_REUSE_DLC 0 #define RFCOMM_RELEASE_ONHUP 1 #define RFCOMM_HANGUP_NOW 2 #define RFCOMM_TTY_ATTACHED 3 -#define RFCOMM_TTY_RELEASED 4 +#define RFCOMM_DEFUNCT_BIT4 4 /* don't reuse this bit - userspace visible */ + +/* rfcomm_dev.status bit definitions */ +#define RFCOMM_DEV_RELEASED 0 struct rfcomm_dev_req { s16 dev_id; |