b44: fix resume, request_irq after hw reset

On resume, call request_irq() after resetting the hardware rather than
before. It's a shared interrupt so the handler could be called
immediately if another device on the same irq interrupts (and will be
called immediately if CONFIG_DEBUG_SHIRQ=y), but unless the hardware is
reinitialised with b44_init_hw() the read of the interrupt status
register will hang the system.

Signed-off-by: James Hogan <james@albanarts.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 8e7c8a8e61c7..171da7f75108 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -2296,18 +2296,27 @@ static int b44_resume(struct ssb_device *sdev)
         if (!netif_running(dev))
                 return 0;
 
+        spin_lock_irq(&bp->lock);
+        b44_init_rings(bp);
+        b44_init_hw(bp, B44_FULL_RESET);
+        spin_unlock_irq(&bp->lock);
+
+        /*
+         * As a shared interrupt, the handler can be called immediately. To be
+         * able to check the interrupt status the hardware must already be
+         * powered back on (b44_init_hw).
+         */
         rc = request_irq(dev->irq, b44_interrupt, IRQF_SHARED, dev->name, dev);
         if (rc) {
                 netdev_err(dev, "request_irq failed\n");
+                spin_lock_irq(&bp->lock);
+                b44_halt(bp);
+                b44_free_rings(bp);
+                spin_unlock_irq(&bp->lock);
                 return rc;
         }
 
-        spin_lock_irq(&bp->lock);
-
-        b44_init_rings(bp);
-        b44_init_hw(bp, B44_FULL_RESET);
         netif_device_attach(bp->dev);
-        spin_unlock_irq(&bp->lock);
 
         b44_enable_ints(bp);
         netif_wake_queue(dev);