e1000e: NIC goes up and immediately goes down
Found that commit d478eb44
was a bad commit.
If the link partner is transmitting codeword (even if NULL codeword),
then the RXCW.C bit will be set so check for RXCW.CW is unnecessary.
Ref: RH BZ 840642
Reported-by: Fabio Futigami <ffutigam@redhat.com>
Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
CC: Marcelo Ricardo Leitner <mleitner@redhat.com>
CC: stable <stable@vger.kernel.org> [2.6.38+]
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
This commit is contained in:
Родитель
5d299f3d3c
Коммит
b7ec70be01
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@ -1601,10 +1601,8 @@ static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
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* auto-negotiation in the TXCW register and disable
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* forced link in the Device Control register in an
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* attempt to auto-negotiate with our link partner.
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* If the partner code word is null, stop forcing
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* and restart auto negotiation.
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*/
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if ((rxcw & E1000_RXCW_C) || !(rxcw & E1000_RXCW_CW)) {
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if (rxcw & E1000_RXCW_C) {
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/* Enable autoneg, and unforce link up */
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ew32(TXCW, mac->txcw);
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ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));
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