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e1000e: log when swflag is cleared unexpectedly on ICH/PCH devices

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Since EXTCNF_CTRL.SWFLAG (used in the ownership arbitration of shared
resources, e.g. the PHY shared between the s/w, f/w, and h/w clients)
can be cleared by any of those clients, log a debug message when
software attempts to clear it and it is already cleared unexpectedly.
And since the swflag is cleared by a hardware reset, the driver does
not need to do that, but the mutex acquired when the bit is set must
still be cleared.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Bruce Allan 2011-05-13 07:19:53 +00:00 committed by Jeff Kirsher
parent 99730e4c13
commit c5caf4825b
1 changed files with 8 additions and 3 deletions
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11
drivers/net/e1000e/ich8lan.c
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@ -889,8 +889,13 @@ static void e1000_release_swflag_ich8lan(struct e1000_hw *hw)
u32 extcnf_ctrl;
extcnf_ctrl = er32(EXTCNF_CTRL);
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
ew32(EXTCNF_CTRL, extcnf_ctrl);
if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG) {
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
ew32(EXTCNF_CTRL, extcnf_ctrl);
} else {
e_dbg("Semaphore unexpectedly released by sw/fw/hw\n");
}
mutex_unlock(&swflag_mutex);
}
@ -3066,7 +3071,7 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
msleep(20);
if (!ret_val)
e1000_release_swflag_ich8lan(hw);
mutex_unlock(&swflag_mutex);
if (ctrl & E1000_CTRL_PHY_RST) {
ret_val = hw->phy.ops.get_cfg_done(hw);