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ixgbe: fix race when setting advertised speed

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Following commands:

modprobe ixgbe
ifconfig ethX up
ethtool -s ethX advertise 0x020

can lead to "setup link failed with code -14" error due to the setup_link
call racing with the SFP detection routine in the watchdog.

This patch resolves this issue by protecting the setup_link call with check
for __IXGBE_IN_SFP_INIT.

Reported-by: Scott Harrison <scoharr2@cisco.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2014-10-28 05:50:03 +00:00 committed by Jeff Kirsher
parent 4d2fcfbcf8
commit e3215f0ac7
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
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@ -342,12 +342,16 @@ static int ixgbe_set_settings(struct net_device *netdev,
if (old == advertised)
return err;
/* this sets the link speed and restarts auto-neg */
while (test_and_set_bit(__IXGBE_IN_SFP_INIT, &adapter->state))
usleep_range(1000, 2000);
hw->mac.autotry_restart = true;
err = hw->mac.ops.setup_link(hw, advertised, true);
if (err) {
e_info(probe, "setup link failed with code %d\n", err);
hw->mac.ops.setup_link(hw, old, true);
}
clear_bit(__IXGBE_IN_SFP_INIT, &adapter->state);
} else {
/* in this case we currently only support 10Gb/FULL */
u32 speed = ethtool_cmd_speed(ecmd);