cxgb3: Fix crash caused by stashing wrong netdev_queue

Commit c3a8c5b6 ("cxgb3: move away from LLTX") exposed a bug in how
cxgb3 looks up the netdev_queue it stashes away in a qset during
initialization.  For multiport devices, the TX queue index it uses is
offset by the first_qset index of each port.  This leads to a crash
once LLTX is removed, since hard_start_xmit is called with one TX
queue lock held, while the TX reclaim timer task grabs a different
(wrong) TX queue lock when it frees skbs.

Fix this by removing the first_qset offset used to look up the TX
queue passed into t3_sge_alloc_qset() from setup_sge_qsets().

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Acked-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 538dda4422dca039b01715e8ca10892af4954ea1..fb5df5c6203e9541849fce56a52abfaedfbe7391 100644 (file)
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -642,8 +642,7 @@ static int setup_sge_qsets(struct adapter *adap)
                struct port_info *pi = netdev_priv(dev);
 
                pi->qs = &adap->sge.qs[pi->first_qset];
-               for (j = pi->first_qset; j < pi->first_qset + pi->nqsets;
-                    ++j, ++qset_idx) {
+               for (j = 0; j < pi->nqsets; ++j, ++qset_idx) {
                        set_qset_lro(dev, qset_idx, pi->rx_offload & T3_LRO);
                        err = t3_sge_alloc_qset(adap, qset_idx, 1,
                                (adap->flags & USING_MSIX) ? qset_idx + 1 :