diff options
author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2009-09-01 23:14:15 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-09-02 23:46:03 -0700 |
commit | 84177a20799072c65a69b62571660d4d9780823c (patch) | |
tree | 2655c26b0601acf13509d25670d3924ae051449c /drivers | |
parent | 3eb0027594e25f5947f074ae53fea30c15c5a7f6 (diff) | |
download | linux-3.10-84177a20799072c65a69b62571660d4d9780823c.tar.gz linux-3.10-84177a20799072c65a69b62571660d4d9780823c.tar.bz2 linux-3.10-84177a20799072c65a69b62571660d4d9780823c.zip |
fec: fix recursive locking of mii_lock
mii_discover_phy is only called by fec_enet_mii (via mip->mii_func). So
&fep->mii_lock is already held and mii_discover_phy must not call
mii_queue which locks &fep->mii_lock, too.
This was noticed by lockdep:
=============================================
[ INFO: possible recursive locking detected ]
2.6.31-rc8-00038-g37d0892 #109
---------------------------------------------
swapper/1 is trying to acquire lock:
(&fep->mii_lock){-.....}, at: [<c01569f8>] mii_queue+0x2c/0xcc
but task is already holding lock:
(&fep->mii_lock){-.....}, at: [<c0156328>] fec_enet_interrupt+0x78/0x460
other info that might help us debug this:
2 locks held by swapper/1:
#0: (rtnl_mutex){+.+.+.}, at: [<c0183534>] rtnl_lock+0x18/0x20
#1: (&fep->mii_lock){-.....}, at: [<c0156328>] fec_enet_interrupt+0x78/0x460
stack backtrace:
Backtrace:
[<c00226fc>] (dump_backtrace+0x0/0x108) from [<c01eac14>] (dump_stack+0x18/0x1c)
r6:c781d118 r5:c03e41d8 r4:00000001
[<c01eabfc>] (dump_stack+0x0/0x1c) from [<c005bae4>] (__lock_acquire+0x1a20/0x1a88)
[<c005a0c4>] (__lock_acquire+0x0/0x1a88) from [<c005bbac>] (lock_acquire+0x60/0x74)
[<c005bb4c>] (lock_acquire+0x0/0x74) from [<c01edda8>] (_spin_lock_irqsave+0x54/0x68)
r7:60000093 r6:c01569f8 r5:c785e468 r4:00000000
[<c01edd54>] (_spin_lock_irqsave+0x0/0x68) from [<c01569f8>] (mii_queue+0x2c/0xcc)
r7:c785e468 r6:c0156b24 r5:600a0000 r4:c785e000
[<c01569cc>] (mii_queue+0x0/0xcc) from [<c0156b78>] (mii_discover_phy+0x54/0xa8)
r8:00000002 r7:00000032 r6:c785e000 r5:c785e360 r4:c785e000
[<c0156b24>] (mii_discover_phy+0x0/0xa8) from [<c0156354>] (fec_enet_interrupt+0xa4/0x460)
r5:c785e360 r4:c077a170
[<c01562b0>] (fec_enet_interrupt+0x0/0x460) from [<c0066674>] (handle_IRQ_event+0x48/0x120)
[<c006662c>] (handle_IRQ_event+0x0/0x120) from [<c0068438>] (handle_level_irq+0x94/0x11c)
...
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Matt Waddel <Matt.Waddel@freescale.com>
Cc: netdev@vger.kernel.org
Cc: Tim Sander <tim01@vlsi.informatik.tu-darmstadt.de>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/net/fec.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/net/fec.c b/drivers/net/fec.c index 967ad01b192..e730da26d29 100644 --- a/drivers/net/fec.c +++ b/drivers/net/fec.c @@ -637,16 +637,15 @@ unlock: } static int -mii_queue(struct net_device *dev, int regval, void (*func)(uint, struct net_device *)) +mii_queue_unlocked(struct net_device *dev, int regval, + void (*func)(uint, struct net_device *)) { struct fec_enet_private *fep; - unsigned long flags; mii_list_t *mip; int retval; /* Add PHY address to register command */ fep = netdev_priv(dev); - spin_lock_irqsave(&fep->mii_lock, flags); regval |= fep->phy_addr << 23; retval = 0; @@ -667,6 +666,19 @@ mii_queue(struct net_device *dev, int regval, void (*func)(uint, struct net_devi retval = 1; } + return retval; +} + +static int +mii_queue(struct net_device *dev, int regval, + void (*func)(uint, struct net_device *)) +{ + struct fec_enet_private *fep; + unsigned long flags; + int retval; + fep = netdev_priv(dev); + spin_lock_irqsave(&fep->mii_lock, flags); + retval = mii_queue_unlocked(dev, regval, func); spin_unlock_irqrestore(&fep->mii_lock, flags); return retval; } @@ -1373,11 +1385,11 @@ mii_discover_phy(uint mii_reg, struct net_device *dev) /* Got first part of ID, now get remainder */ fep->phy_id = phytype << 16; - mii_queue(dev, mk_mii_read(MII_REG_PHYIR2), + mii_queue_unlocked(dev, mk_mii_read(MII_REG_PHYIR2), mii_discover_phy3); } else { fep->phy_addr++; - mii_queue(dev, mk_mii_read(MII_REG_PHYIR1), + mii_queue_unlocked(dev, mk_mii_read(MII_REG_PHYIR1), mii_discover_phy); } } else { |