netdev - re: ixgbe: fixup hard dependencies on supporting 8 traffic classes

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Message-ID: <20111012063555.GA23359@elgon.mountain>
Date:	Wed, 12 Oct 2011 09:35:55 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	john.r.fastabend@...el.com
Cc:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: re: ixgbe: fixup hard dependencies on supporting 8 traffic classes

Hello John Fastabend,

This is a semi-automatic email about new static checker warnings.

The patch 32701dc2e616: "ixgbe: fixup hard dependencies on supporting
8 traffic classes" from Sep 27, 2011, leads to the following Smatch
complaint:

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +3366 ixgbe_configure_dcb()
	 error: we previously assumed 'adapter->ixgbe_ieee_ets' could be null (see line 3357)

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
  3356	
  3357			if (adapter->ixgbe_ieee_ets) {
                            ^^^^^^^^^^^^^^^^^^^^^^^
Null check.

  3358				struct ieee_ets *ets = adapter->ixgbe_ieee_ets;
  3359				int max_frame = dev->mtu + ETH_HLEN + ETH_FCS_LEN;
  3360	
  3361				ixgbe_dcb_hw_ets(&adapter->hw, ets, max_frame);
  3362			}
  3363	
  3364			if (adapter->ixgbe_ieee_pfc) {
  3365				struct ieee_pfc *pfc = adapter->ixgbe_ieee_pfc;
  3366				u8 *prio_tc = adapter->ixgbe_ieee_ets->prio_tc;
                                              ^^^^^^^^^^^^^^^^^^^^^^^^^
New dereference.

  3367	
  3368				ixgbe_dcb_hw_pfc_config(&adapter->hw, pfc->pfc_en,

regards,
dan carpenter

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