summaryrefslogtreecommitdiffstats
path: root/drivers/net/igbvf/netdev.c
diff options
context:
space:
mode:
authorJesse Brandeburg <jesse.brandeburg@intel.com>2011-07-20 00:56:21 +0000
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-04 04:59:07 -0700
commit945a51517cc0bd9e461f2018624dfc1faef9ddee (patch)
tree5782ffe27f3fb8f5b4cbc19ffe7b74bff36c6a05 /drivers/net/igbvf/netdev.c
parentd3e614577198757d5854caa912e88f2d4296479b (diff)
intel drivers: repair missing flush operations
after review of all intel drivers, found several instances where drivers had the incorrect pattern of: memory mapped write(); delay(); which should always be: memory mapped write(); write flush(); /* aka memory mapped read */ delay(); explanation: The reason for including the flush is that writes can be held (posted) in PCI/PCIe bridges, but the read always has to complete synchronously and therefore has to flush all pending writes to a device. If a write is held and followed by a delay, the delay means nothing because the write may not have reached hardware (maybe even not until the next read) Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/igbvf/netdev.c')
-rw-r--r--drivers/net/igbvf/netdev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index 1330c8e932d..40ed066e3ef 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -1226,6 +1226,7 @@ static void igbvf_configure_tx(struct igbvf_adapter *adapter)
/* disable transmits */
txdctl = er32(TXDCTL(0));
ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
+ e1e_flush();
msleep(10);
/* Setup the HW Tx Head and Tail descriptor pointers */
@@ -1306,6 +1307,7 @@ static void igbvf_configure_rx(struct igbvf_adapter *adapter)
/* disable receives */
rxdctl = er32(RXDCTL(0));
ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
+ e1e_flush();
msleep(10);
rdlen = rx_ring->count * sizeof(union e1000_adv_rx_desc);