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e1000: look in the page and not in skb->data for the last byte 

The code seems to want to look at the last byte where the HW puts some
information. Since the skb->data area is never seen by the HW I guess it
does not work as expected. We pass the page address to the HW so I
*think* in order to get to the last byte where the information might be
one should use the page buffer and take a look.
This is of course not more than just compile tested.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Sebastian Andrzej Siewior 2012-05-11 16:30:46 +00:00 committed by Jeff Kirsher
parent 4af4a23328
commit a3060858c2
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/intel/e1000/e1000_main.c
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@ -4066,7 +4066,11 @@ static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
/* errors is only valid for DD + EOP descriptors */
if (unlikely((status & E1000_RXD_STAT_EOP) &&
(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK))) {
u8 last_byte = *(skb->data + length - 1);
u8 *mapped;
u8 last_byte;
mapped = page_address(buffer_info->page);
last_byte = *(mapped + length - 1);
if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
last_byte)) {
spin_lock_irqsave(&adapter->stats_lock,