• Jorg Schummer's avatar
    mmc: mmc_rescan detects card change in one run · 94d89efb
    Jorg Schummer authored
    With this patch, mmc_rescan can detect the removal of an mmc card and
    the insertion of (possibly another) card in the same run. This means
    that a card change can be detected without having to call
    mmc_detect_change multiple times.
    
    This change generalises the core such that it can be easily used by
    hosts which provide a mechanism to detect only the presence of a card
    reader cover, which has to be taken off in order to insert a card. Other
    hosts ("card detect" or "MMC_CAP_NEEDS_POLL") each receive an event when
    a card is removed and when a card is inserted, so it is sufficient for
    them if mmc_rescan handles only one event at a time. "Cover detect"
    hosts, however, only receive events about the cover status. This means
    that between 2 subsequent events, both a card removal and a card
    insertion can occur. In this case, the pre-patch version of mmc_rescan
    would only detect the removal of the previous card but not the insertion
    of the new card.
    Signed-off-by: default avatarJorg Schummer <ext-jorg.2.schummer@nokia.com>
    Signed-off-by: default avatarPierre Ossman <pierre@ossman.eu>
    94d89efb
core.c 23.9 KB