From 35205b211c8d17a8a0b5e8926cb7c73e9a7ef1ad Mon Sep 17 00:00:00 2001
From: Ben Hutchings <bhutchings@solarflare.com>
Date: Tue, 5 Mar 2013 01:03:47 +0000
Subject: [PATCH] sfc: Disable soft interrupt handling during
 efx_device_detach_sync()

efx_device_detach_sync() locks all TX queues before marking the device
detached and thus disabling further TX scheduling.  But it can still
be interrupted by TX completions which then result in TX scheduling in
soft interrupt context.  This will deadlock when it tries to acquire
a TX queue lock that efx_device_detach_sync() already acquired.

To avoid deadlock, we must use netif_tx_{,un}lock_bh().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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