netdev - [patch for 2.6.27? 03/10] drivers/net/atl1e/: don't take the mdio_lock in atl1e

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Date:	Mon, 22 Sep 2008 14:10:17 -0700
From:	akpm@...ux-foundation.org
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org, matthew@....cx,
	jie.yang@...eros.com, willy@...ux.intel.com
Subject: [patch for 2.6.27? 03/10] drivers/net/atl1e/: don't take the mdio_lock in atl1e_probe

From: Matthew Wilcox <matthew@....cx>

Lockdep warns about the mdio_lock taken with interrupts enabled then later
taken from interrupt context.  Initially, I considered changing these to
spin_lock_irq/spin_unlock_irq, but then I looked at atl1e_phy_init() and
saw that it calls msleep().  Sleeping while holding a spinlock is not
allowed either.

In the probe path, we haven't registered the interrupt handler, so it
can't poke at this card yet.  It's before we call register_netdev(), so I
don't think any other threads can reach this card either.  If I'm right,
we don't need a spinlock at all.

Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
Acked-by: Jie Yang <jie.yang@...eros.com>
Cc: Jeff Garzik <jeff@...zik.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/net/atl1e/atl1e_main.c |    2 --
 1 file changed, 2 deletions(-)

diff -puN drivers/net/atl1e/atl1e_main.c~drivers-net-atl1e-dont-take-the-mdio_lock-in-atl1e_probe drivers/net/atl1e/atl1e_main.c
--- a/drivers/net/atl1e/atl1e_main.c~drivers-net-atl1e-dont-take-the-mdio_lock-in-atl1e_probe
+++ a/drivers/net/atl1e/atl1e_main.c
@@ -2390,9 +2390,7 @@ static int __devinit atl1e_probe(struct 
 	}
 
 	/* Init GPHY as early as possible due to power saving issue  */
-	spin_lock(&adapter->mdio_lock);
 	atl1e_phy_init(&adapter->hw);
-	spin_unlock(&adapter->mdio_lock);
 	/* reset the controller to
 	 * put the device in a known good starting state */
 	err = atl1e_reset_hw(&adapter->hw);
_
--
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