Re: [PATCH] bluetooth: fix locking in hci_sock_dev_event()

[David Miller]

From: Satyam Sharma <ssatyam@xxxxxxxxxxxxxx>
Date: Thu, 17 May 2007 11:13:36 +0530 (IST)

> [PATCH] 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().
> 
> Cc: David Miller <davem@xxxxxxxxxxxxx>
> Signed-off-by: Satyam Sharma <ssatyam@xxxxxxxxxxxxxx>
> Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>

Thanks I'll merge this in.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/