host->chan_rx is NULL when UNIPHIER_SD_CAP_BROKEN_DMA_RX quirk flag is set. In this case, it should not set up DMA. Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> --- drivers/mmc/host/uniphier-sd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mmc/host/uniphier-sd.c b/drivers/mmc/host/uniphier-sd.c index 10d49aa..1ee9fd0 100644 --- a/drivers/mmc/host/uniphier-sd.c +++ b/drivers/mmc/host/uniphier-sd.c @@ -251,6 +251,9 @@ static void uniphier_sd_internal_dma_start(struct tmio_mmc_host *host, u32 dma_mode; int sg_len; + if ((data->flags & MMC_DATA_READ) && !host->chan_rx) + goto force_pio; + if (WARN_ON(host->sg_len != 1)) goto force_pio; -- 2.7.4
