netdev - [PATCH for 2.6.31] cxgb3: Fix crash caused by stashing wrong netdev

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Message-ID: <adabpnty7qm.fsf_-_@cisco.com>
Date:	Thu, 09 Jul 2009 12:30:25 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Divy Le Ray <divy@...lsio.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [PATCH for 2.6.31] 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@...co.com>
---
OK, found the bug that was causing the crash I saw.  With this patch
everything looks solid again.  Please apply.

 drivers/net/cxgb3/cxgb3_main.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 538dda4..fb5df5c 100644
--- 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 :
--
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