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[SCSI] qla4xxx: Fix the IDC locking mechanism 

This ensures the transition of dev_state from COLD to
INITIALIZING is within lock and atomic.

Signed-off-by: Nilesh Javali <nilesh.javali@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
hifive-unleashed-5.1
Nilesh Javali 2011-12-01 22:42:11 -08:00 committed by James Bottomley
parent ce505f9d1d
commit e3f37d1636
1 changed files with 11 additions and 8 deletions
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19
drivers/scsi/qla4xxx/ql4_nx.c
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@ -1792,8 +1792,11 @@ int qla4_8xxx_device_state_handler(struct scsi_qla_host *ha)
int rval = QLA_SUCCESS;
unsigned long dev_init_timeout;
if (!test_bit(AF_INIT_DONE, &ha->flags))
if (!test_bit(AF_INIT_DONE, &ha->flags)) {
qla4_8xxx_idc_lock(ha);
qla4_8xxx_set_drv_active(ha);
qla4_8xxx_idc_unlock(ha);
}
dev_state = qla4_8xxx_rd_32(ha, QLA82XX_CRB_DEV_STATE);
ql4_printk(KERN_INFO, ha, "1:Device state is 0x%x = %s\n", dev_state,
@ -1802,8 +1805,8 @@ int qla4_8xxx_device_state_handler(struct scsi_qla_host *ha)
/* wait for 30 seconds for device to go ready */
dev_init_timeout = jiffies + (ha->nx_dev_init_timeout * HZ);
qla4_8xxx_idc_lock(ha);
while (1) {
qla4_8xxx_idc_lock(ha);
if (time_after_eq(jiffies, dev_init_timeout)) {
ql4_printk(KERN_WARNING, ha, "Device init failed!\n");
@ -1819,15 +1822,14 @@ int qla4_8xxx_device_state_handler(struct scsi_qla_host *ha)
/* NOTE: Make sure idc unlocked upon exit of switch statement */
switch (dev_state) {
case QLA82XX_DEV_READY:
qla4_8xxx_idc_unlock(ha);
goto exit;
case QLA82XX_DEV_COLD:
rval = qla4_8xxx_device_bootstrap(ha);
qla4_8xxx_idc_unlock(ha);
goto exit;
case QLA82XX_DEV_INITIALIZING:
qla4_8xxx_idc_unlock(ha);
msleep(1000);
qla4_8xxx_idc_lock(ha);
break;
case QLA82XX_DEV_NEED_RESET:
if (!ql4xdontresethba) {
@ -1841,31 +1843,32 @@ int qla4_8xxx_device_state_handler(struct scsi_qla_host *ha)
msleep(1000);
qla4_8xxx_idc_lock(ha);
}
qla4_8xxx_idc_unlock(ha);
break;
case QLA82XX_DEV_NEED_QUIESCENT:
qla4_8xxx_idc_unlock(ha);
/* idc locked/unlocked in handler */
qla4_8xxx_need_qsnt_handler(ha);
qla4_8xxx_idc_lock(ha);
/* fall thru needs idc_locked */
break;
case QLA82XX_DEV_QUIESCENT:
qla4_8xxx_idc_unlock(ha);
msleep(1000);
qla4_8xxx_idc_lock(ha);
break;
case QLA82XX_DEV_FAILED:
qla4_8xxx_idc_unlock(ha);
qla4xxx_dead_adapter_cleanup(ha);
rval = QLA_ERROR;
qla4_8xxx_idc_lock(ha);
goto exit;
default:
qla4_8xxx_idc_unlock(ha);
qla4xxx_dead_adapter_cleanup(ha);
rval = QLA_ERROR;
qla4_8xxx_idc_lock(ha);
goto exit;
}
}
exit:
qla4_8xxx_idc_unlock(ha);
return rval;
}