• Terry Barnaby's avatar
    mmc: atmel-mci: pio hang on block errors · bdbc5d0c
    Terry Barnaby authored
    The driver is doing, by default, multi-block reads. When a block error
    occurs, card/block.c instigates a single block read: "mmcblk0: retrying
    using single block read".  It leaves the sg chain intact and just changes
    the length attribute for the first sg entry and the overall sg_len
    parameter.  When atmci_read_data_pio is called to read the single block
    of data it ignores the sg_len and expects to read more than 512 bytes as
    it sees there are multiple items in the sg list. No more data comes as
    the controller has only been commanded to get one block.
    Signed-off-by: default avatarTerry Barnaby <terry@beam.ltd.uk>
    Acked-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
    Cc: stable <stable@vger.kernel.org> # 3.2+
    Signed-off-by: default avatarChris Ball <cjb@laptop.org>
    bdbc5d0c
atmel-mci.c 67.1 KB