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>

diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h
index 50247dfe8f574d2a7184c8ea675b5ecabdcc37cc..d2f790df6dcbf6872084c49d74a8a63efb58f569 100644 (file)
--- a/drivers/net/ethernet/sfc/efx.h
+++ b/drivers/net/ethernet/sfc/efx.h
@@ -171,9 +171,9 @@ static inline void efx_device_detach_sync(struct efx_nic *efx)
         * TX scheduler is stopped when we're done and before
         * netif_device_present() becomes false.
         */
-       netif_tx_lock(dev);
+       netif_tx_lock_bh(dev);
        netif_device_detach(dev);
-       netif_tx_unlock(dev);
+       netif_tx_unlock_bh(dev);
 }
 
 #endif /* EFX_EFX_H */