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author | Satyam Sharma <ssatyam@cse.iitk.ac.in> | 2007-05-16 23:50:16 -0700 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-17 14:20:30 -0700 |
commit | 4ce61d1c7a8ef4c1337fa983a3036d4010e3c19e (patch) | |
tree | e7bf734478bc3f726d883439d5fdc44699d9a20a /Kbuild | |
parent | 689d79469b64662440a93ffbd1cbf994510bcbf6 (diff) | |
download | linux-stable-4ce61d1c7a8ef4c1337fa983a3036d4010e3c19e.tar.gz linux-stable-4ce61d1c7a8ef4c1337fa983a3036d4010e3c19e.tar.bz2 linux-stable-4ce61d1c7a8ef4c1337fa983a3036d4010e3c19e.zip |
[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 'Kbuild')
0 files changed, 0 insertions, 0 deletions