https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204521
--- Comment #156 from h...@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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