diff options
Diffstat (limited to 'drivers/mmc/host/tmio_mmc_dma.c')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_dma.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c index 7e86662717d..2aa616dec32 100644 --- a/drivers/mmc/host/tmio_mmc_dma.c +++ b/drivers/mmc/host/tmio_mmc_dma.c @@ -22,8 +22,11 @@ #define TMIO_MMC_MIN_DMA_LEN 8 -static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) +void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) { + if (!host->chan_tx || !host->chan_rx) + return; + #if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE) /* Switch DMA mode on or off - SuperH specific? */ sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0); |