diff options
| author | Jesse Brandeburg <jesse.brandeburg@intel.com> | 2011-07-20 00:56:21 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2011-08-04 04:59:07 -0700 |
| commit | 945a51517cc0bd9e461f2018624dfc1faef9ddee (patch) | |
| tree | 5782ffe27f3fb8f5b4cbc19ffe7b74bff36c6a05 /drivers/net/e1000 | |
| parent | d3e614577198757d5854caa912e88f2d4296479b (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/e1000')
| -rw-r--r-- | drivers/net/e1000/e1000_ethtool.c | 6 | ||||
| -rw-r--r-- | drivers/net/e1000/e1000_hw.c | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/e1000/e1000_ethtool.c b/drivers/net/e1000/e1000_ethtool.c index c5f0f04219f..5548d464261 100644 --- a/drivers/net/e1000/e1000_ethtool.c +++ b/drivers/net/e1000/e1000_ethtool.c @@ -838,6 +838,7 @@ static int e1000_intr_test(struct e1000_adapter *adapter, u64 *data) /* Disable all the interrupts */ ew32(IMC, 0xFFFFFFFF); + E1000_WRITE_FLUSH(); msleep(10); /* Test each interrupt */ @@ -856,6 +857,7 @@ static int e1000_intr_test(struct e1000_adapter *adapter, u64 *data) adapter->test_icr = 0; ew32(IMC, mask); ew32(ICS, mask); + E1000_WRITE_FLUSH(); msleep(10); if (adapter->test_icr & mask) { @@ -873,6 +875,7 @@ static int e1000_intr_test(struct e1000_adapter *adapter, u64 *data) adapter->test_icr = 0; ew32(IMS, mask); ew32(ICS, mask); + E1000_WRITE_FLUSH(); msleep(10); if (!(adapter->test_icr & mask)) { @@ -890,6 +893,7 @@ static int e1000_intr_test(struct e1000_adapter *adapter, u64 *data) adapter->test_icr = 0; ew32(IMC, ~mask & 0x00007FFF); ew32(ICS, ~mask & 0x00007FFF); + E1000_WRITE_FLUSH(); msleep(10); if (adapter->test_icr) { @@ -901,6 +905,7 @@ static int e1000_intr_test(struct e1000_adapter *adapter, u64 *data) /* Disable all the interrupts */ ew32(IMC, 0xFFFFFFFF); + E1000_WRITE_FLUSH(); msleep(10); /* Unhook test interrupt handler */ @@ -1394,6 +1399,7 @@ static int e1000_run_loopback_test(struct e1000_adapter *adapter) if (unlikely(++k == txdr->count)) k = 0; } ew32(TDT, k); + E1000_WRITE_FLUSH(); msleep(200); time = jiffies; /* set the start time for the receive */ good_cnt = 0; diff --git a/drivers/net/e1000/e1000_hw.c b/drivers/net/e1000/e1000_hw.c index 1698622af43..8545c7aa93e 100644 --- a/drivers/net/e1000/e1000_hw.c +++ b/drivers/net/e1000/e1000_hw.c @@ -446,6 +446,7 @@ s32 e1000_reset_hw(struct e1000_hw *hw) /* Must reset the PHY before resetting the MAC */ if ((hw->mac_type == e1000_82541) || (hw->mac_type == e1000_82547)) { ew32(CTRL, (ctrl | E1000_CTRL_PHY_RST)); + E1000_WRITE_FLUSH(); msleep(5); } @@ -3752,6 +3753,7 @@ static s32 e1000_acquire_eeprom(struct e1000_hw *hw) /* Clear SK and CS */ eecd &= ~(E1000_EECD_CS | E1000_EECD_SK); ew32(EECD, eecd); + E1000_WRITE_FLUSH(); udelay(1); } @@ -3824,6 +3826,7 @@ static void e1000_release_eeprom(struct e1000_hw *hw) eecd &= ~E1000_EECD_SK; /* Lower SCK */ ew32(EECD, eecd); + E1000_WRITE_FLUSH(); udelay(hw->eeprom.delay_usec); } else if (hw->eeprom.type == e1000_eeprom_microwire) { |