diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2006-11-21 17:33:01 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-11-21 17:33:01 -0800 |
| commit | 700f9672c9a61c12334651a94d17ec04620e1976 (patch) | |
| tree | 7b78a376a8a1001642338f5576fc9aeccf87546f /net/irda/irlmp.c | |
| parent | 4498c80d9c1ebdf42837be6a52ead35a2aa2b819 (diff) | |
[IRDA]: Lockdep fix.
On Sat, 2006-11-18 at 16:12 +0300, Andrey Borzenkov wrote:
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.19-rc5-2avb #2
> - ---------------------------------------------
> pppd/26425 is trying to acquire lock:
> (&hashbin->hb_spinlock){....}, at: [<dfdea87a>] irlmp_slsap_inuse+0x5a/0x170
> [irda]
>
> but task is already holding lock:
> (&hashbin->hb_spinlock){....}, at: [<dfdea857>] irlmp_slsap_inuse+0x37/0x170
> [irda]
>
> other info that might help us debug this:
> 1 lock held by pppd/26425:
> #0: (&hashbin->hb_spinlock){....}, at: [<dfdea857>]
> irlmp_slsap_inuse+0x37/0x170 [irda]
>
> stack backtrace:
> [<c010413c>] dump_trace+0x1cc/0x200
> [<c010418a>] show_trace_log_lvl+0x1a/0x30
> [<c01047f2>] show_trace+0x12/0x20
> [<c01048c9>] dump_stack+0x19/0x20
> [<c01346ca>] __lock_acquire+0x8fa/0xc20
> [<c0134d2d>] lock_acquire+0x5d/0x80
> [<c02a851c>] _spin_lock+0x2c/0x40
> [<dfdea87a>] irlmp_slsap_inuse+0x5a/0x170 [irda]
> [<dfdebab2>] irlmp_open_lsap+0x62/0x180 [irda]
> [<dfdf35d1>] irttp_open_tsap+0x181/0x230 [irda]
> [<dfdc0c3d>] ircomm_open_tsap+0x5d/0xa0 [ircomm]
> [<dfdc05d8>] ircomm_open+0xb8/0xd0 [ircomm]
> [<dfdd0477>] ircomm_tty_open+0x4f7/0x570 [ircomm_tty]
> [<c020bbe4>] tty_open+0x174/0x340
> [<c016bd69>] chrdev_open+0x89/0x170
> [<c0167bd6>] __dentry_open+0xa6/0x1d0
> [<c0167da5>] nameidata_to_filp+0x35/0x40
> [<c0167df9>] do_filp_open+0x49/0x50
> [<c0167e47>] do_sys_open+0x47/0xd0
> [<c0167f0c>] sys_open+0x1c/0x20
> [<c010307d>] sysenter_past_esp+0x56/0x8d
> [<b7f86410>] 0xb7f86410
> =======================
The comment at the nesting lock says:
/* Careful for priority inversions here !
* irlmp->links is never taken while another IrDA
* spinlock is held, so we are safe. Jean II */
So, under the assumption the author was right, it just needs a lockdep
annotation.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/irda/irlmp.c')
| -rw-r--r-- | net/irda/irlmp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/irda/irlmp.c b/net/irda/irlmp.c index 5073261b9d0c..fede83763095 100644 --- a/net/irda/irlmp.c +++ b/net/irda/irlmp.c @@ -1678,7 +1678,8 @@ static int irlmp_slsap_inuse(__u8 slsap_sel) * every IrLAP connection and check every LSAP associated with each * the connection. */ - spin_lock_irqsave(&irlmp->links->hb_spinlock, flags); + spin_lock_irqsave_nested(&irlmp->links->hb_spinlock, flags, + SINGLE_DEPTH_NESTING); lap = (struct lap_cb *) hashbin_get_first(irlmp->links); while (lap != NULL) { IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, goto errlap;); |