netdev - [PATCH] sky2: recovery deadlock fix

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Message-ID: <20071203170217.492d9eb9@freepuppy.rosehill>
Date:	Mon, 3 Dec 2007 17:02:17 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	netdev@...r.kernel.org
Subject: [PATCH] sky2: recovery deadlock fix

Prevent deadlock in sky2 recovery logic. sky2_down calls napi_synchronize
which gets stuck if napi was already disabled. 

Fix by rearranging slightly and not calling napi_disable until after
both ports are stopped. The napi_disable probably is being overly
paranoid, but it is safe now.

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>

---
Please apply for 2.6.24 (upstream-fixes)

--- a/drivers/net/sky2.c	2007-11-30 16:51:50.000000000 -0800
+++ b/drivers/net/sky2.c	2007-11-30 16:54:52.000000000 -0800
@@ -2906,16 +2906,14 @@ static void sky2_restart(struct work_str
 	int i, err;
 
 	rtnl_lock();
-	sky2_write32(hw, B0_IMSK, 0);
-	sky2_read32(hw, B0_IMSK);
-	napi_disable(&hw->napi);
-
 	for (i = 0; i < hw->ports; i++) {
 		dev = hw->dev[i];
 		if (netif_running(dev))
 			sky2_down(dev);
 	}
 
+	napi_disable(&hw->napi);
+	sky2_write32(hw, B0_IMSK, 0);
 	sky2_reset(hw);
 	sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
 	napi_enable(&hw->napi);
--
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