sdhci: be more cautious about block count register

The block count register shouldn't be trusted for single block transfers,
so avoid using it completely when calculating transferred bytes.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f2bc87a..7181e86 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -477,8 +477,8 @@ static void sdhci_finish_data(struct sdhci_host *host)
        /*
         * Controller doesn't count down when in single block mode.
         */
-       if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
-               blocks = 0;
+       if (data->blocks == 1)
+               blocks = (data->error == MMC_ERR_NONE) ? 0 : 1;
        else
                blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
        data->bytes_xfered = data->blksz * (data->blocks - blocks);