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authorSatyam Sharma <ssatyam@cse.iitk.ac.in>2007-05-16 23:50:16 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-05-17 14:20:30 -0700
commit4ce61d1c7a8ef4c1337fa983a3036d4010e3c19e (patch)
treee7bf734478bc3f726d883439d5fdc44699d9a20a /net/bluetooth/hci_sysfs.c
parent689d79469b64662440a93ffbd1cbf994510bcbf6 (diff)
[BLUETOOTH]: Fix locking in hci_sock_dev_event().
We presently use lock_sock() to acquire a lock on a socket in hci_sock_dev_event(), but this goes BUG because lock_sock() can sleep and we're already holding a read-write spinlock at that point. So, we must use the non-sleeping BH version, bh_lock_sock(). However, hci_sock_dev_event() is called from user context and hence using simply bh_lock_sock() will deadlock against a concurrent softirq that tries to acquire a lock on the same socket. Hence, disabling BH's before acquiring the socket lock and enable them afterwards, is the proper solution to fix socket locking in hci_sock_dev_event(). Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bluetooth/hci_sysfs.c')
0 files changed, 0 insertions, 0 deletions