linux-kernel - [PATCH] b44: fix resume, request

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Message-Id: <201010120022.13171.james@albanarts.com>
Date:	Tue, 12 Oct 2010 00:22:12 +0100
From:	James Hogan <james@...anarts.com>
To:	Gary Zambrano <zambrano@...adcom.com>,
	Jiri Pirko <jpirko@...hat.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Larry Finger <Larry.Finger@...inger.net>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] b44: fix resume, request_irq after hw reset

This driver was hanging on resume because it was requesting a shared irq
that it wasn't ready to immediately handle, which was tested in
request_irq because of the CONFIG_DEBUG_SHIRQ config option. The
interrupt handler tried to read the interrupt status register but for
some reason it hung the system.

The request_irq is now moved a bit later after resetting the hardware
which seems to fix it.

Signed-off-by: James Hogan <james@...anarts.com>
---
 drivers/net/b44.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 1e620e2..dbba981 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -2296,12 +2296,6 @@ static int b44_resume(struct ssb_device *sdev)
 	if (!netif_running(dev))
 		return 0;
 
-	rc = request_irq(dev->irq, b44_interrupt, IRQF_SHARED, dev->name, dev);
-	if (rc) {
-		netdev_err(dev, "request_irq failed\n");
-		return rc;
-	}
-
 	spin_lock_irq(&bp->lock);
 
 	b44_init_rings(bp);
@@ -2309,6 +2303,12 @@ static int b44_resume(struct ssb_device *sdev)
 	netif_device_attach(bp->dev);
 	spin_unlock_irq(&bp->lock);
 
+	rc = request_irq(dev->irq, b44_interrupt, IRQF_SHARED, dev->name, dev);
+	if (rc) {
+		netdev_err(dev, "request_irq failed\n");
+		return rc;
+	}
+
 	b44_enable_ints(bp);
 	netif_wake_queue(dev);
 
-- 
1.7.2.3

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