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ixgbe: force unlock on timeout 

The semaphore can be in locked state upon driver load, particularly
on 82598 if a machine is rebooted due to panic and the semaphore was
acquired just prior to the panic.

This patch unlocks the semaphore if it times out.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2011-04-08 01:23:59 +00:00 committed by Jeff Kirsher
parent a1cbb15c13
commit 51275d37a8
1 changed files with 22 additions and 0 deletions
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22
drivers/net/ixgbe/ixgbe_common.c
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@ -1189,6 +1189,28 @@ static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw)
udelay(50);
}
if (i == timeout) {
hw_dbg(hw, "Driver can't access the Eeprom - SMBI Semaphore "
"not granted.\n");
/*
* this release is particularly important because our attempts
* above to get the semaphore may have succeeded, and if there
* was a timeout, we should unconditionally clear the semaphore
* bits to free the driver to make progress
*/
ixgbe_release_eeprom_semaphore(hw);
udelay(50);
/*
* one last try
* If the SMBI bit is 0 when we read it, then the bit will be
* set and we have the semaphore
*/
swsm = IXGBE_READ_REG(hw, IXGBE_SWSM);
if (!(swsm & IXGBE_SWSM_SMBI))
status = 0;
}
/* Now get the semaphore between SW/FW through the SWESMBI bit */
if (status == 0) {
for (i = 0; i < timeout; i++) {