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[SCSI] qla4xxx: Clear the rom lock if the firmware died while holding it. 

There is a possibility that the firmware dies while the rom
lock is held. The only way to recover from this condition is
to forcefully unlock.

Signed-off-by: Shyam Sundar <shyam.sundar@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Shyam Sundar 2010-10-06 22:50:51 -07:00 committed by James Bottomley
parent 2657c800db
commit b25ee66f2d
1 changed files with 43 additions and 6 deletions
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49
drivers/scsi/qla4xxx/ql4_nx.c
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@ -839,8 +839,11 @@ qla4_8xxx_rom_lock(struct scsi_qla_host *ha)
done = qla4_8xxx_rd_32(ha, QLA82XX_PCIE_REG(PCIE_SEM2_LOCK));
if (done == 1)
break;
if (timeout >= qla4_8xxx_rom_lock_timeout)
if (timeout >= qla4_8xxx_rom_lock_timeout) {
ql4_printk(KERN_WARNING, ha,
"%s: Failed to acquire rom lock", __func__);
return -1;
}
timeout++;
@ -1550,6 +1553,21 @@ qla4_8xxx_try_start_fw(struct scsi_qla_host *ha)
return rval;
}
static void qla4_8xxx_rom_lock_recovery(struct scsi_qla_host *ha)
{
if (qla4_8xxx_rom_lock(ha)) {
/* Someone else is holding the lock. */
dev_info(&ha->pdev->dev, "Resetting rom_lock\n");
}
/*
* Either we got the lock, or someone
* else died while holding it.
* In either case, unlock.
*/
qla4_8xxx_rom_unlock(ha);
}
/**
* qla4_8xxx_device_bootstrap - Initialize device, set DEV_READY, start fw
* @ha: pointer to adapter structure
@ -1559,11 +1577,12 @@ qla4_8xxx_try_start_fw(struct scsi_qla_host *ha)
static int
qla4_8xxx_device_bootstrap(struct scsi_qla_host *ha)
{
int rval, i, timeout;
int rval = QLA_ERROR;
int i, timeout;
uint32_t old_count, count;
int need_reset = 0, peg_stuck = 1;
if (qla4_8xxx_need_reset(ha))
goto dev_initialize;
need_reset = qla4_8xxx_need_reset(ha);
old_count = qla4_8xxx_rd_32(ha, QLA82XX_PEG_ALIVE_COUNTER);
@ -1572,12 +1591,30 @@ qla4_8xxx_device_bootstrap(struct scsi_qla_host *ha)
if (timeout) {
qla4_8xxx_wr_32(ha, QLA82XX_CRB_DEV_STATE,
QLA82XX_DEV_FAILED);
return QLA_ERROR;
return rval;
}
count = qla4_8xxx_rd_32(ha, QLA82XX_PEG_ALIVE_COUNTER);
if (count != old_count)
peg_stuck = 0;
}
if (need_reset) {
/* We are trying to perform a recovery here. */
if (peg_stuck)
qla4_8xxx_rom_lock_recovery(ha);
goto dev_initialize;
} else {
/* Start of day for this ha context. */
if (peg_stuck) {
/* Either we are the first or recovery in progress. */
qla4_8xxx_rom_lock_recovery(ha);
goto dev_initialize;
} else {
/* Firmware already running. */
rval = QLA_SUCCESS;
goto dev_ready;
}
}
dev_initialize:
@ -1603,7 +1640,7 @@ qla4_8xxx_device_bootstrap(struct scsi_qla_host *ha)
ql4_printk(KERN_INFO, ha, "HW State: READY\n");
qla4_8xxx_wr_32(ha, QLA82XX_CRB_DEV_STATE, QLA82XX_DEV_READY);
return QLA_SUCCESS;
return rval;
}
/**