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| author | Jesse Brandeburg <jesse.brandeburg@intel.com> | 2006-11-01 08:47:42 -0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-12-02 00:11:59 -0500 |
| commit | 2ce9047f5d8464039da8ff986e71be5546e229c0 (patch) | |
| tree | 4e888a376bb97c9688d8ebb70d1ffef144b5529f /drivers/net/e1000 | |
| parent | 21c4d5e07859a6fc0f62be37da15b161e142c8d1 (diff) | |
| download | linux-2ce9047f5d8464039da8ff986e71be5546e229c0.tar.gz linux-2ce9047f5d8464039da8ff986e71be5546e229c0.tar.bz2 linux-2ce9047f5d8464039da8ff986e71be5546e229c0.zip | |
e1000: add mmiowb() for IA64 to sync tail writes
IA64 SMP systems were seeing TX issues with multiple cpu's attempting
to write tail registers unordered. This mmiowb() fixes the issue.
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Diffstat (limited to 'drivers/net/e1000')
| -rw-r--r-- | drivers/net/e1000/e1000_main.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 93b97c6b8a63..681b738c6dac 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -2867,6 +2867,9 @@ e1000_tx_queue(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring, tx_ring->next_to_use = i; writel(i, adapter->hw.hw_addr + tx_ring->tdt); + /* we need this if more than one processor can write to our tail + * at a time, it syncronizes IO on IA64/Altix systems */ + mmiowb(); } /** |