linux-kernel - [161/197] e1000e: stop cleaning when we reach tx_ring->next_to

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Date:	Thu, 22 Apr 2010 12:10:12 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Terry Loftin <terry.loftin@...com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Matthew Burgess <matthew@...uxfromscratch.org>
Subject: [161/197] e1000e: stop cleaning when we reach tx_ring->next_to_use

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Terry Loftin <terry.loftin@...com>

commit dac876193cd79ced36d0462749ea47c05844fb49 upstream.

Tx ring buffers after tx_ring->next_to_use are volatile and could
change, possibly causing a crash.  Stop cleaning when we hit
tx_ring->next_to_use.

Signed-off-by: Terry Loftin <terry.loftin@...com>
Acked-by: Bruce Allan <bruce.w.allan@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Matthew Burgess <matthew@...uxfromscratch.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/e1000e/netdev.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -665,6 +665,8 @@ static bool e1000_clean_tx_irq(struct e1
 				i = 0;
 		}
 
+		if (i == tx_ring->next_to_use)
+			break;
 		eop = tx_ring->buffer_info[i].next_to_watch;
 		eop_desc = E1000_TX_DESC(*tx_ring, eop);
 	}


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