int
mptsas_restart_ioc(mptsas_t *mpt)
{
        int             rval = DDI_SUCCESS;
        mptsas_target_t *ptgt = NULL;

        ASSERT(mutex_owned(&mpt->m_mutex));

        /*
         * Wait until all the allocated sense data buffers for DMA are freed.
         */
        while (mpt->m_extreq_sense_refcount > 0)
                cv_wait(&mpt->m_extreq_sense_refcount_cv, &mpt->m_mutex);

        /*
         * Set a flag telling I/O path that we're processing a reset.  This is
         * needed because after the reset is complete, the hash table still
         * needs to be rebuilt.  If I/Os are started before the hash table is
         * rebuilt, I/O errors will occur.  This flag allows I/Os to be marked
         * so that they can be retried.
         */
        mpt->m_in_reset = TRUE;

        /*
         * Set all throttles to HOLD
         */
        for (ptgt = refhash_first(mpt->m_targets); ptgt != NULL;
            ptgt = refhash_next(mpt->m_targets, ptgt)) {
                mptsas_set_throttle(mpt, ptgt, HOLD_THROTTLE);
        }

        /*
         * Disable interrupts
         */