[Bug 204521] [new driver] [request] Port rtsx from OpenBSD to FreeBSD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204521

--- Comment #156 from hlh at restart.be ---
(In reply to Gary Jennejohn from comment #155)

In this case:

       if (device_delete_child(sc->rtsx_dev, sc->rtsx_mmc_dev))
               device_printf(sc->rtsx_dev, "Detaching MMC bus failed\n");
       sc->rtsx_mmc_dev = NULL;
       RTSX_UNLOCK(sc);

The LOCK try to postpone a new occurrence of rtsx_card_task()
to reconnect a card.

In this case:

       RTSX_UNLOCK(sc);
       if (device_delete_child(sc->rtsx_dev, sc->rtsx_mmc_dev))
               device_printf(sc->rtsx_dev, "Detaching MMC bus failed\n");
       sc->rtsx_mmc_dev = NULL;


A new occurrence of rtsx_card_task() may reconnect a card and then
rtsx_mmc_dev is replace by NULL. And so even if it is bracketed by LOCL/UNLOCK.

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