The _fini(9E) function is called when the system is about to try to unload the SCSI HBA driver. The _fini() function must call mod_remove(9F) to determine whether the driver can be unloaded. If mod_remove() returns 0, the module can be unloaded. The HBA driver must deallocate any global resources allocated in _init(9E). The HBA driver must also call scsi_hba_fini(9F).
_fini() must return the value returned by mod_remove().
The HBA driver must not free any resources or call scsi_hba_fini(9F) unless mod_remove(9F) returns 0.
Example 18–1 shows module initialization for SCSI HBA.
static struct dev_ops isp_dev_ops = { DEVO_REV, /* devo_rev */ 0, /* refcnt */ isp_getinfo, /* getinfo */ nulldev, /* identify */ nulldev, /* probe */ isp_attach, /* attach */ isp_detach, /* detach */ nodev, /* reset */ NULL, /* driver operations */ NULL, /* bus operations */ isp_power, /* power management */ isp_quiesce, /* quiesce */ }; /* * Local static data */ static kmutex_t isp_global_mutex; static void *isp_state; int _init(void) { int err; if ((err = ddi_soft_state_init(&isp_state, sizeof (struct isp), 0)) != 0) { return (err); } if ((err = scsi_hba_init(&modlinkage)) == 0) { mutex_init(&isp_global_mutex, "isp global mutex", MUTEX_DRIVER, NULL); if ((err = mod_install(&modlinkage)) != 0) { mutex_destroy(&isp_global_mutex); scsi_hba_fini(&modlinkage); ddi_soft_state_fini(&isp_state); } } return (err); } int _fini(void) { int err; if ((err = mod_remove(&modlinkage)) == 0) { mutex_destroy(&isp_global_mutex); scsi_hba_fini(&modlinkage); ddi_soft_state_fini(&isp_state); } return (err); }