wireless: hostap, fix oops due to early probing interrupt

Jouni,

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rtg

---------------------------------

From: Colin Ian King <[email protected]>
Date: Wed, 19 Aug 2009 15:39:21 +0100
Subject: [PATCH] wireless: hostap, fix oops due to early probing interrupt

Spurious shared interrupts or early probing interrupts can cause the hostap interrupt handler to oops before the driver has fully configured the IO base port addresses. In some cases the oops can be because the hardware shares an interrupt line, on other cases it is due to a race condition between probing for the hardware and configuring the IO base port. The latter occurs because the probing is required to determin the hardware port address which is only determined when the probe can interrupt the hardware (catch 22).

This patch catches this pre-configured condition to avoid the oops.

---
 drivers/net/wireless/hostap/hostap_hw.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

index d4d857e..0212ee3 100644
@@ -2628,6 +2628,15 @@ static irqreturn_t prism2_interrupt(int irq, void *dev_id)
 	int events = 0;
 	u16 ev;
 
+	/* Detect early interrupt before driver is fully configued */
+	if (!dev->base_addr) {
+		if (net_ratelimit()) {
+			printk(KERN_DEBUG "%s: Interrupt, but dev not configured\n",
+			       dev->name);
+		}
+		return IRQ_HANDLED;
+	}
+
 	iface = netdev_priv(dev);
 	local = iface->local;
 

1.6.2.4