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ixgbe: Check link wants report current link state 

Currently check link reports the link state as down, if at any time
the link had previously gone down since the last time the LINKS
register was read.  This does not accurately reflect the function of
the check link call, which should be to return the CURRENT link
state. Code now reads the LINKS registers twice, once to clear the
previous and again to get the current value.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2011-02-16 01:38:08 +00:00 committed by Jeff Kirsher
parent 76d97dd4c4
commit 48de36c565
1 changed files with 10 additions and 1 deletions
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11
drivers/net/ixgbe/ixgbe_common.c
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@ -2769,10 +2769,19 @@ s32 ixgbe_clear_vfta_generic(struct ixgbe_hw *hw)
s32 ixgbe_check_mac_link_generic(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
bool *link_up, bool link_up_wait_to_complete)
{
u32 links_reg;
u32 links_reg, links_orig;
u32 i;
/* clear the old state */
links_orig = IXGBE_READ_REG(hw, IXGBE_LINKS);
links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
if (links_orig != links_reg) {
hw_dbg(hw, "LINKS changed from %08X to %08X\n",
links_orig, links_reg);
}
if (link_up_wait_to_complete) {
for (i = 0; i < IXGBE_LINK_UP_TIME; i++) {
if (links_reg & IXGBE_LINKS_UP) {